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xfrm: fix xfrm_state_construct() auth-trunc leak

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-80843

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80843

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "958ae9f261319e1cdc44879886bcda2263258cca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "fb7f3e74789a3c89647f4eb768f6dfaf4a751e72",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "ba0c110c205855b3f1e3130d8c0fdb484d704c8c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "c8837bbe792257af547fd1c0252553ce13148795",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "71d42da01740ec6557837bebec0bc48cfc3b4c39",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "cf67361e78dca488d6e4df8396a53e6745a3a80e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "37426395cb90ef217beec8407a14bd82153793d3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "be19d20e53a239572bb2a28efcc1cd2b069b1ef9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4447bb33f09444920a8f1d89e1540137429351b6",
        "lessThan": "c12cbf56320fb633484ee0ca1fb7d68d6b64b213",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/xfrm/xfrm_user.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.33"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.33",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.269",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.220",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.187",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.156",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.108",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.49",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/xfrm/xfrm_user.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80843

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34859 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-80843 · Revision 1Source updated