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smack: fix cred UAF in smack_file_send_sigiotask()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: smack: fix cred UAF in smack_file_send_sigiotask() When inspecting the credentials of another task, objective credentials (->real_cred, accessed with __task_cred()) must always be used. Accessing ->cred on a non-current task is forbidden unless that task is being created or destroyed; a task is allowed to change its own ->cred pointer with no synchronization, and changing ->cred should only affect the current syscall. smack_file_send_sigiotask() was accessing both sets of credentials: First tsk->cred, then __task_cred(tsk). Fix it, always access the objective credentials here. I have tested that this bug can lead to a KASAN-reported UAF of struct cred in smack_file_send_sigiotask(), and that this fix prevents the race.

Announced Source revision 1
Original source ↗

CVE-2026-80928

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-2026-80928

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": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "a512366d84e134a9eefc2cc40eeb6e80e2ec162c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "7c7fe043f3099d0d35002b248967f75e55345b93",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "f9c7b1f2b9d8f4176d2632743f51400855978ace",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "b5bcf3adfa27279da4401ab8f1e1a706601a92be",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "ed64aa505875a3b4defd504ee8e59e1949246a62",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "b791401bf389a1546a830d2b381ca60fe94c7870",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
        "lessThan": "fedc88e38ce979a720cd2de042578cb5df3dc8de",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "security/smack/smack_lsm.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "security/smack/smack_lsm.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80928

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34889 · Revision 1
Added to Heist Feed
Publisher date
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