CVE-2026-80843 (GCVE-0-2026-80843)
Vulnerability from cvelistv5
Published
2026-09-04 15:54
Modified
2026-09-04 15:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: fix xfrm_state_construct() auth-trunc leak
attach_auth_trunc() can allocate x->aalg while leaving
x->props.aalgo at zero when the selected auth algorithm has no
sadb_alg_id. One real case is cmac(aes).
xfrm_state_construct() then treats !x->props.aalgo as "no auth
algorithm attached yet" and calls attach_auth(). That overwrites
x->aalg and loses the first allocation. Any later failure or teardown
only frees the replacement pointer.
Check whether x->aalg is already attached instead of inferring that
state from x->props.aalgo.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 Version: 4447bb33f09444920a8f1d89e1540137429351b6 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.33"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.187",
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},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.108",
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},
{
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"status": "unaffected",
"version": "6.18.49",
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},
{
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"status": "unaffected",
"version": "7.1.13",
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},
{
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"status": "unaffected",
"version": "7.2.3",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix xfrm_state_construct() auth-trunc leak\n\nattach_auth_trunc() can allocate x-\u003eaalg while leaving\nx-\u003eprops.aalgo at zero when the selected auth algorithm has no\nsadb_alg_id. One real case is cmac(aes).\n\nxfrm_state_construct() then treats !x-\u003eprops.aalgo as \"no auth\nalgorithm attached yet\" and calls attach_auth(). That overwrites\nx-\u003eaalg and loses the first allocation. Any later failure or teardown\nonly frees the replacement pointer.\n\nCheck whether x-\u003eaalg is already attached instead of inferring that\nstate from x-\u003eprops.aalgo."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:54:53.328Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca"
},
{
"url": "https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72"
},
{
"url": "https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c"
},
{
"url": "https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795"
},
{
"url": "https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39"
},
{
"url": "https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e"
},
{
"url": "https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3"
},
{
"url": "https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9"
},
{
"url": "https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213"
}
],
"title": "xfrm: fix xfrm_state_construct() auth-trunc leak",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80843",
"datePublished": "2026-09-04T15:54:53.328Z",
"dateReserved": "2026-08-26T14:34:25.796Z",
"dateUpdated": "2026-09-04T15:54:53.328Z",
"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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