FKIE_CVE-2026-63912
Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-10-19 21:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: esp: restore combined single-frag length gate
The ESP out-of-place fast path appends the trailer in esp_output_head()
before esp_output_tail() allocates the destination page frag. The
head-side gate currently checks skb->data_len and tailen separately, but
the tail code allocates a single destination frag from the combined
post-trailer skb->data_len.
Reject the page-frag fast path when the combined aligned length exceeds a
page. Otherwise skb_page_frag_refill() may fall back to a single page while
the destination sg still spans the combined skb->data_len.
Restore this combined-length page gate for both IPv4 and IPv6.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv4/esp4.c",
"net/ipv6/esp6.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "566295735530ee513326049b0540f32ec050bf2e",
"status": "affected",
"version": "c075c3ea031757f8ea2d34567565b61a868c08d5",
"versionType": "git"
},
{
"lessThan": "5d7ab86e2b6bc23054616bf6ac562013bf60af8c",
"status": "affected",
"version": "a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea",
"versionType": "git"
},
{
"lessThan": "36519e3d941fc99d3b52c134dbaf311f987a4708",
"status": "affected",
"version": "5bd8baab087dff657e05387aee802e70304cc813",
"versionType": "git"
},
{
"lessThan": "322e48187e0245ab2fff6fec2220b0cae677dbec",
"status": "affected",
"version": "5bd8baab087dff657e05387aee802e70304cc813",
"versionType": "git"
},
{
"lessThan": "b84091ceddc9f133229dceab3ccc930bf27f9cba",
"status": "affected",
"version": "5bd8baab087dff657e05387aee802e70304cc813",
"versionType": "git"
},
{
"lessThan": "c093468aea8277f77272a4f199b2e15e19cabb59",
"status": "affected",
"version": "5bd8baab087dff657e05387aee802e70304cc813",
"versionType": "git"
},
{
"lessThan": "65f3b3fc2347b89fe21db1e92c7681368415f095",
"status": "affected",
"version": "5bd8baab087dff657e05387aee802e70304cc813",
"versionType": "git"
},
{
"lessThan": "dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40",
"status": "affected",
"version": "5bd8baab087dff657e05387aee802e70304cc813",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66b0c95bb0aa7652ba1eba293d0d5993b35a38",
"versionType": "git"
},
{
"status": "affected",
"version": "ef6f83df1209a7d9bd1c605a62457d4c00f9179e",
"versionType": "git"
},
{
"status": "affected",
"version": "3defefd22ad5fbbe639b6157fb7e6311b2bf333d",
"versionType": "git"
},
{
"status": "affected",
"version": "b657030870bb5351c5b1e84d4e9f186da6ca0496",
"versionType": "git"
},
{
"lessThan": "5.10.259",
"status": "affected",
"version": "5.10.113",
"versionType": "semver"
},
{
"lessThan": "5.15.210",
"status": "affected",
"version": "5.15.36",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.288",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.252",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.205",
"versionType": "semver"
},
{
"lessThan": "5.18",
"status": "affected",
"version": "5.17.5",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv4/esp4.c",
"net/ipv6/esp6.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"lessThan": "5.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: restore combined single-frag length gate\n\nThe ESP out-of-place fast path appends the trailer in esp_output_head()\nbefore esp_output_tail() allocates the destination page frag. The\nhead-side gate currently checks skb-\u003edata_len and tailen separately, but\nthe tail code allocates a single destination frag from the combined\npost-trailer skb-\u003edata_len.\n\nReject the page-frag fast path when the combined aligned length exceeds a\npage. Otherwise skb_page_frag_refill() may fall back to a single page while\nthe destination sg still spans the combined skb-\u003edata_len.\n\nRestore this combined-length page gate for both IPv4 and IPv6."
}
],
"id": "CVE-2026-63912",
"lastModified": "2026-10-19T21:17:10.230",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-63912",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:33:08.898705Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-19T16:17:09.097",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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Nomenclature
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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