CVE-2026-43452 (GCVE-0-2026-43452)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-05-11 22:24
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: x_tables: guard option walkers against 1-byte tail reads
When the last byte of options is a non-single-byte option kind, walkers
that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end
of the option area.
Add an explicit i == optlen - 1 check before dereferencing op[i + 1]
in xt_tcpudp and xt_dccp option walkers.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Version: 2e4e6a17af35be359cc8f1c924f8f198fbd478cc |
||
{
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"lessThan": "2.6.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
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},
{
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"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: guard option walkers against 1-byte tail reads\n\nWhen the last byte of options is a non-single-byte option kind, walkers\nthat advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end\nof the option area.\n\nAdd an explicit i == optlen - 1 check before dereferencing op[i + 1]\nin xt_tcpudp and xt_dccp option walkers."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T22:24:51.810Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a"
},
{
"url": "https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823"
},
{
"url": "https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907"
},
{
"url": "https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540"
},
{
"url": "https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c"
},
{
"url": "https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5"
},
{
"url": "https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36"
},
{
"url": "https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4"
}
],
"title": "netfilter: x_tables: guard option walkers against 1-byte tail reads",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43452",
"datePublished": "2026-05-08T14:22:17.361Z",
"dateReserved": "2026-05-01T14:12:56.010Z",
"dateUpdated": "2026-05-11T22:24:51.810Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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