Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-10-28. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date: 2026-10-31. 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: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 3599e6b3cc1ada96883d496a50a210d3afbb6987 (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 78bf6b6bb19541d19fbda6242e7cfe2c682763c0 (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 3bd9e113d50034db99d7ef69fd8e5242d15e414a (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 3884358a9286b17f389a72b1426fc4547c23c111 (git)
- affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < f84eca5817390257cef78013d0112481c503b4a3 (git)
Linux / Linux
Default status: affected
- affected: 3.9
- unaffected: 0 to < 3.9 (semver)
- unaffected: 5.10.257 to ≤ 5.10.* (semver)
- unaffected: 5.15.208 to ≤ 5.15.* (semver)
- unaffected: 6.1.174 to ≤ 6.1.* (semver)
- unaffected: 6.6.141 to ≤ 6.6.* (semver)
- unaffected: 6.12.91 to ≤ 6.12.* (semver)
- unaffected: 6.18.33 to ≤ 6.18.* (semver)
- unaffected: 7.0.10 to ≤ 7.0.* (semver)
- unaffected: 7.1 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
- https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987
- https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c
- https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5
- https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0
- https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e
- https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a
- https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111
- https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3
- http://www.openwall.com/lists/oss-security/2026/05/13/5
- http://www.openwall.com/lists/oss-security/2026/05/21/11
- http://www.openwall.com/lists/oss-security/2026/05/21/12
- http://www.openwall.com/lists/oss-security/2026/05/21/13
- https://access.redhat.com/security/cve/CVE-2026-46300
- https://bugzilla.redhat.com/show_bug.cgi?id=2477015
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json
- https://access.redhat.com/errata/RHSA-2026:19540
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/errata/RHBA-2026:20032
- https://access.redhat.com/errata/RHSA-2026:21695
- https://access.redhat.com/errata/RHSA-2026:21690
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:23233
- https://access.redhat.com/errata/RHSA-2026:20087
- https://access.redhat.com/errata/RHSA-2026:25044
- https://access.redhat.com/errata/RHSA-2026:34098
- https://access.redhat.com/errata/RHSA-2026:21656
- https://access.redhat.com/errata/RHSA-2026:23245
- https://access.redhat.com/errata/RHSA-2026:21702
- https://access.redhat.com/errata/RHSA-2026:23240
- https://access.redhat.com/errata/RHSA-2026:20299
- https://access.redhat.com/errata/RHSA-2026:19569
- https://access.redhat.com/errata/RHSA-2026:19705
- https://access.redhat.com/errata/RHSA-2026:20593
- https://access.redhat.com/errata/RHSA-2026:20054
- https://access.redhat.com/errata/RHSA-2026:20129
- https://access.redhat.com/errata/RHSA-2026:19568
- https://access.redhat.com/errata/RHSA-2026:19666
- https://access.redhat.com/errata/RHSA-2026:23470
- https://access.redhat.com/errata/RHSA-2026:20130
- https://access.redhat.com/errata/RHSA-2026:20051
- https://access.redhat.com/errata/RHSA-2026:19521
- https://access.redhat.com/errata/RHSA-2026:23471
- https://access.redhat.com/errata/RHSA-2026:23469
- https://access.redhat.com/errata/RHSA-2026:24814
- https://access.redhat.com/errata/RHSA-2026:23468
- https://access.redhat.com/errata/RHSA-2026:19664
- https://access.redhat.com/errata/RHSA-2026:19711
- https://access.redhat.com/errata/RHSA-2026:19875
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-46300
Monitored source mentions
Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.
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": 0.1613,
"percentile": 0.96972
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.1613,
"percentile": 0.96953
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.1613,
"percentile": 0.9695
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.1613,
"percentile": 0.96948
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.1613,
"percentile": 0.96946
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.1613,
"percentile": 0.96942
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.1613,
"percentile": 0.96939
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.1613,
"percentile": 0.96937
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.1613,
"percentile": 0.96932
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.1613,
"percentile": 0.96928
}03 Nov 2026, 02:22 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/skbuff.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
"lessThan": "3884358a9286b17f389a72b1426fc4547c23c111",
"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
"versionType": "git"
},
{
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"status": "affected",
"version": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.9"
},
{
"lessThan": "3.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.257",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.208",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.174",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.257",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.208",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.174",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.141",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.91",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.33",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.10",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "3.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to. If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers. In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data(). If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags. The tailroom copy path does not need the marker because it copies\nbytes into @to's linear data rather than transferring frag descriptors."
}
],
"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 corruptible shared-frag condition only arises from local page splicing (sendfile/vmsplice/MSG_SPLICE_PAGES); NIC-received packets never carry SKBFL_SHARED_FRAG, and the skb must reach ESP input via loopback/local SA, so a local account is required.\nAC:L - The attacker controls the spliced file pages, the ESP key and payload, and the packet sizes/timing that drive coalescing on loopback, making the marker loss and in-place decrypt reliably reproducible.\nPR:L - An unprivileged user can splice readable file pages and obtain CAP_NET_ADMIN to install xfrm SAs/policies inside a user+network namespace (unshare -Urn); the global page cache is still corrupted from there.\nUI:N - The attacker performs the splice, IPsec setup, and packet delivery entirely on its own; no victim action is needed to trigger the in-place decrypt over shared frags.\nS:U - The corruption stays within the kernel's memory authority as a standard local memory-corruption/privilege-escalation primitive, with no crossing of a VM/IOMMU boundary.\nC:H - The write primitive into page-cache memory (e.g., overwriting a shared library's cached code) can be leveraged into code execution and arbitrary memory disclosure.\nI:H - ESP decrypts attacker-controlled plaintext in place over page-cache-backed pages, yielding an arbitrary write of chosen content into globally-shared file/code memory.\nA:H - Overwriting page-cache pages backing files or executable code corrupts shared kernel state and readily causes oopses, crashes, and system instability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:31:05.381Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987"
},
{
"url": "https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c"
},
{
"url": "https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5"
},
{
"url": "https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0"
},
{
"url": "https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e"
},
{
"url": "https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a"
},
{
"url": "https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111"
},
{
"url": "https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3"
}
],
"title": "net: skbuff: preserve shared-frag marker during coalescing",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-46300",
"datePublished": "2026-05-23T11:44:02.231Z",
"dateReserved": "2026-05-13T15:03:33.111Z",
"dateUpdated": "2026-10-29T03:55:37.330Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2026-46300",
"cwes": [
"CWE-456"
],
"dateAdded": "2026-10-28",
"dueDate": "2026-10-31",
"forensicTriage": "Yes",
"knownRansomwareCampaignUse": "Unknown",
"notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 ; https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c ; https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 ; https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 ; https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e ; https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a ; https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 ; https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-46300",
"product": "Kernel",
"requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
"shortDescription": "Linux Kernel contains a missing initialization of a variable vulnerability that could allow for unintended modification of page-cache-backed data via failure to preserve the shared-fragment marker during socket buffer coalescing, causing ESP input processing to decrypt shared fragments in place. This vulnerability can be chained with CVE-2026-109618 and CVE-2026-109619 to implant PHP webshells and run commands as root.",
"vendorProject": "Linux",
"vulnerabilityName": "Linux Kernel Missing Initialization of a Variable Vulnerability"
}