FKIE_CVE-2026-99999
Vulnerability from fkie_nvd - Published: 2026-10-15 13:17 - Updated: 2026-10-15 23:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv4: validate checksum_start before completing checksum
If a packet with bad checksum metadata gets into the ipv4 stack,
skb_checksum_help can corrupt the network header and cause a bunch of
mischief.
This was discovered and reported by Paulos, and has been reporoduced
by others independently since.
We really shouldn't allow such packets in, but as a defence
in depth measure, let's also check before we complete the checksum.
A more complete validation at input is forthcoming, but needs more work.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"include/net/ip.h",
"net/bridge/netfilter/nf_conntrack_bridge.c",
"net/ipv4/ip_output.c",
"net/netfilter/nfnetlink_queue.c",
"net/netfilter/xt_CHECKSUM.c",
"net/xfrm/xfrm_output.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a464d950f31c89565cbaae038cc60db04fe01956",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "0fab003ef4698e0628060a45a48f14b43ba2a40a",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "94524b7b32691de2e2ce162c04d6cbc9106e5cbf",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "a65f69e0f38ffbed1b128029e09097436416dc8b",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "32a8b0adaa18e52aaa0b246b5ffe683075354dbb",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "f3e835af6226f1dd12160cbd696081e9b6155de0",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "c3e33464746166264334641dc850a36eef7e6326",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
},
{
"lessThan": "6785011f8b16abf40b1e9d8b2e332232b3e68822",
"status": "affected",
"version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"include/net/ip.h",
"net/bridge/netfilter/nf_conntrack_bridge.c",
"net/ipv4/ip_output.c",
"net/netfilter/nfnetlink_queue.c",
"net/netfilter/xt_CHECKSUM.c",
"net/xfrm/xfrm_output.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.27"
},
{
"lessThan": "2.6.27",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.272",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.223",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.190",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc7",
"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\nipv4: validate checksum_start before completing checksum\n\nIf a packet with bad checksum metadata gets into the ipv4 stack,\nskb_checksum_help can corrupt the network header and cause a bunch of\nmischief.\n\nThis was discovered and reported by Paulos, and has been reporoduced\nby others independently since.\n\nWe really shouldn\u0027t allow such packets in, but as a defence\nin depth measure, let\u0027s also check before we complete the checksum.\n\nA more complete validation at input is forthcoming, but needs more work."
}
],
"id": "CVE-2026-99999",
"lastModified": "2026-10-15T23:19:38.590",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.5,
"impactScore": 6.0,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-10-15T13:17:14.137",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://pwn.ai/blog/Pwnescape"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-challenge"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/10/15/5"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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