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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. 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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 \u2014 `setsockopt(SO_CNX_ADVICE)` and a lockless `udp_sendmsg()` \u2014 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 \u2014 including a sandboxed Android app, as in the observed real-world exploit \u2014 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 \u2014 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 \u2014 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"},"cna_checked":1794219601,"cve":"CVE-2024-36971","description":"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.","epss":{"date":"2026-11-12","epss":0.02701,"percentile":0.86141},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"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"},"kev_checked":1794522003,"products":"Linux Linux","references":["https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13","https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72","https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6","https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf","https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4","https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508","https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc","https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971"],"score":{"baseScore":7.8,"baseSeverity":"HIGH","provider":"Linux","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"solutions":"","state":"PUBLISHED","title":"net: fix __dst_negative_advice() race","updated_at":1794500401,"workarounds":""},"sources":[]}