GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

FKIE_CVE-2026-80843

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18
Severity
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_user.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "958ae9f261319e1cdc44879886bcda2263258cca",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "fb7f3e74789a3c89647f4eb768f6dfaf4a751e72",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "ba0c110c205855b3f1e3130d8c0fdb484d704c8c",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "c8837bbe792257af547fd1c0252553ce13148795",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "71d42da01740ec6557837bebec0bc48cfc3b4c39",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "cf67361e78dca488d6e4df8396a53e6745a3a80e",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "37426395cb90ef217beec8407a14bd82153793d3",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "be19d20e53a239572bb2a28efcc1cd2b069b1ef9",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            },
            {
              "lessThan": "c12cbf56320fb633484ee0ca1fb7d68d6b64b213",
              "status": "affected",
              "version": "4447bb33f09444920a8f1d89e1540137429351b6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_user.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "lessThan": "2.6.33",
              "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",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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: 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."
    }
  ],
  "id": "CVE-2026-80843",
  "lastModified": "2026-09-04T16:18:12.877",
  "metrics": {},
  "published": "2026-09-04T16:18:12.877",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.