November 13, 2026 Follow Egret
CVE-2024-36971 · CVE record: PUBLISHED

net: fix __dst_negative_advice() race

Linux Linux

In the Linux kernel, the following vulnerability has been resolved: net: fix __dst_negative_advice() race __dst_negative_advice() does not enforce proper RCU rules when sk->dst_cache must be cleared, leading to possible UAF. RCU rules are that we must first clear sk->sk_dst_cache, then call dst_release(old_dst). Note that sk_dst_reset(sk) is implementing this protocol correctly, while __dst_negative_advice() uses the wrong order. Given that ip6_negative_advice() has special logic against RTF_CACHE, this means each of the three ->negative_advice() existing methods must perform the sk_dst_reset() themselves. Note the check against NULL dst is centralized in __dst_negative_advice(), there is no need to duplicate it in various callbacks. Many thanks to Clement Lecigne for tracking this issue. This old bug became visible after the blamed commit, using UDP sockets.

Exploitation evidence

Known exploited · CISA KEV listed

Added 2024-08-07. Ransomware campaign use: Unknown.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA due date: 2024-08-28. This is the catalog’s deadline, not an assessment of your organization’s exposure.

KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗

Reported products and versions

Linux / Linux

Default status: unaffected

  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13 (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < db0082825037794c5dba9959c9de13ca34cc5e72 (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < 2295a7ef5c8c49241bff769e7826ef2582e532a6 (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < eacb8b195579c174a6d3e12a9690b206eb7f28cf (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < 81dd3c82a456b0015461754be7cb2693991421b4 (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < 5af198c387128a9d2ddd620b0f0803564a4d4508 (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < b8af8e6118a6605f0e495a58d591ca94a85a50fc (git)
  • affected: a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to < 92f1655aa2b2294d0b49925f3b875a634bd3b59e (git)

Linux / Linux

Default status: affected

  • affected: 4.6
  • unaffected: 0 to < 4.6 (semver)
  • unaffected: 4.19.316 to ≤ 4.19.* (semver)
  • unaffected: 5.4.278 to ≤ 5.4.* (semver)
  • unaffected: 5.10.219 to ≤ 5.10.* (semver)
  • unaffected: 5.15.161 to ≤ 5.15.* (semver)
  • unaffected: 6.1.94 to ≤ 6.1.* (semver)
  • unaffected: 6.6.34 to ≤ 6.6.* (semver)
  • unaffected: 6.9.4 to ≤ 6.9.* (semver)
  • unaffected: 6.10 to ≤ * (original_commit_for_fix)

Fixes and workarounds

No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.

Sources and related reporting

CVE Program record ↗ · Download tracked evidence as JSON

Observed change timeline

History begins when Egret first downloads each source. It is not the complete upstream CVE history.

12 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-12",
  "epss": 0.02701,
  "percentile": 0.86141
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10 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-10",
  "epss": 0.02701,
  "percentile": 0.86057
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09 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-09",
  "epss": 0.02701,
  "percentile": 0.86039
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08 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-08",
  "epss": 0.02701,
  "percentile": 0.86032
}
07 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-07",
  "epss": 0.02701,
  "percentile": 0.8602
}
06 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-06",
  "epss": 0.02701,
  "percentile": 0.86
}
06 Nov 2026, 06:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-05",
  "epss": 0.02701,
  "percentile": 0.8599
}
04 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-04",
  "epss": 0.02701,
  "percentile": 0.85978
}
04 Nov 2026, 06:20 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

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              "cpe:2.3:o:linux:linux_kernel:6.9.4:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "affected",
            "product": "linux_kernel",
            "vendor": "linux",
            "versions": [
              {
                "lessThan": "6.10",
                "status": "unaffected",
                "version": "6.9.4",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:linux:linux_kernel:6.10:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "affected",
            "product": "linux_kernel",
            "vendor": "linux",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "6.10",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-36971",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-08-08T03:55:25.565547Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2024-08-07",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971"
              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-21T22:56:22.761Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2024-08-07T00:00:00.000Z",
            "value": "CVE-2024-36971 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/dst_ops.h",
            "include/net/sock.h",
            "net/ipv4/route.c",
            "net/ipv6/route.c",
            "net/xfrm/xfrm_policy.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "051c0bde9f0450a2ec3d62a86d2a0d2fad117f13",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "db0082825037794c5dba9959c9de13ca34cc5e72",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "2295a7ef5c8c49241bff769e7826ef2582e532a6",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "eacb8b195579c174a6d3e12a9690b206eb7f28cf",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "81dd3c82a456b0015461754be7cb2693991421b4",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "5af198c387128a9d2ddd620b0f0803564a4d4508",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "b8af8e6118a6605f0e495a58d591ca94a85a50fc",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            },
            {
              "lessThan": "92f1655aa2b2294d0b49925f3b875a634bd3b59e",
              "status": "affected",
              "version": "a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/dst_ops.h",
            "include/net/sock.h",
            "net/ipv4/route.c",
            "net/ipv6/route.c",
            "net/xfrm/xfrm_policy.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.316",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.278",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.219",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.161",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.316",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.278",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.219",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.161",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.94",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.34",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9.4",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix __dst_negative_advice() race\n\n__dst_negative_advice() does not enforce proper RCU rules when\nsk->dst_cache must be cleared, leading to possible UAF.\n\nRCU rules are that we must first clear sk->sk_dst_cache,\nthen call dst_release(old_dst).\n\nNote that sk_dst_reset(sk) is implementing this protocol correctly,\nwhile __dst_negative_advice() uses the wrong order.\n\nGiven that ip6_negative_advice() has special logic\nagainst RTF_CACHE, this means each of the three ->negative_advice()\nexisting methods must perform the sk_dst_reset() themselves.\n\nNote the check against NULL dst is centralized in\n__dst_negative_advice(), there is no need to duplicate\nit in various callbacks.\n\nMany thanks to Clement Lecigne for tracking this issue.\n\nThis old bug became visible after the blamed commit, using UDP sockets."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The race must be driven by two concurrent local socket operations on the same fd — `setsockopt(SO_CNX_ADVICE)` and a lockless `udp_sendmsg()` — so the attacker needs local syscall access. A remote peer can drive only the free side (TCP retransmit timeouts, ICMP-induced PMTU/redirect exceptions), not the racing `sk_dst_cache` writer.\nAC:L - The attacker controls both sides of the race (one thread calling `SO_CNX_ADVICE`, another calling `sendmsg()` on the same connected socket) and can create the required route-exception/obsolete-dst precondition at will, retrying indefinitely across many sockets; in-the-wild exploitation confirms it is reliably winnable.\nPR:L - `SO_CNX_ADVICE` in `sock_setsockopt()` carries no capability check and a connected UDP socket needs no privileges, so any unprivileged local user — including a sandboxed Android app, as in the observed real-world exploit — can reach the code.\nUI:N - Exploitation is entirely self-driven through the attacker's own socket, timers and threads; no victim action is needed.\nS:U - The corrupted `dst_entry` and the resulting code execution are both within the kernel's own security authority — standard local privilege escalation, no VM/IOMMU boundary crossed.\nC:H - The refcount underflow yields a use-after-free on a `dst_entry` whose contents (ops table, metrics, neighbour and function pointers) can be replaced by attacker-sprayed data, giving a kernel read primitive and full disclosure once escalated to root.\nI:H - `dst_entry` holds `ops`, `input()` and `output()` function pointers invoked on every transmit, so reclaiming the freed object gives direct control-flow hijack and arbitrary kernel write — this was weaponized as an in-the-wild Android privilege escalation.\nA:H - Even unweaponized, the premature free and dangling `sk_dst_cache` dereference cause refcount WARNs, memory corruption and kernel oops/panic, and the trigger can be repeated freely by an unprivileged process."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:32:22.196Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13"
        },
        {
          "url": "https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72"
        },
        {
          "url": "https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e"
        }
      ],
      "title": "net: fix __dst_negative_advice() race",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-36971",
    "datePublished": "2024-06-10T09:03:23.878Z",
    "dateReserved": "2024-05-30T15:25:07.082Z",
    "dateUpdated": "2026-08-05T11:32:22.196Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
03 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-03",
  "epss": 0.02701,
  "percentile": 0.85954
}
03 Nov 2026, 02:22 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-02",
  "epss": 0.02701,
  "percentile": 0.85936
}
03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed

Stored KEV snapshot at this observation.

{
  "cveID": "CVE-2024-36971",
  "cwes": [
    "CWE-416"
  ],
  "dateAdded": "2024-08-07",
  "dueDate": "2024-08-28",
  "forensicTriage": "No",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see:   https://source.android.com/docs/security/bulletin/2024-08-01,  https://lore.kernel.org/linux-cve-announce/20240610090330.1347021-2-lee@kernel.org/T/#u ; https://nvd.nist.gov/vuln/detail/CVE-2024-36971",
  "product": "Kernel",
  "requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
  "shortDescription": "Android contains an unspecified vulnerability in the kernel that allows for remote code execution. This vulnerability resides in Linux Kernel and could impact other products, including but not limited to Android OS.",
  "vendorProject": "Android",
  "vulnerabilityName": "Android Kernel Remote Code Execution Vulnerability"
}
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