FKIE_CVE-2026-80928

Vulnerability from fkie_nvd - Published: 2026-09-11 20:18 - Updated: 2026-10-19 09:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/smack/smack_lsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a512366d84e134a9eefc2cc40eeb6e80e2ec162c",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            },
            {
              "lessThan": "7c7fe043f3099d0d35002b248967f75e55345b93",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            },
            {
              "lessThan": "f9c7b1f2b9d8f4176d2632743f51400855978ace",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            },
            {
              "lessThan": "b5bcf3adfa27279da4401ab8f1e1a706601a92be",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            },
            {
              "lessThan": "ed64aa505875a3b4defd504ee8e59e1949246a62",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            },
            {
              "lessThan": "b791401bf389a1546a830d2b381ca60fe94c7870",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            },
            {
              "lessThan": "fedc88e38ce979a720cd2de042578cb5df3dc8de",
              "status": "affected",
              "version": "3b11a1decef07c19443d24ae926982bc8ec9f4c0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "security/smack/smack_lsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\nsmack: fix cred UAF in smack_file_send_sigiotask()\n\nWhen inspecting the credentials of another task, objective credentials\n(-\u003ereal_cred, accessed with __task_cred()) must always be used.\n\nAccessing -\u003ecred on a non-current task is forbidden unless that task is\nbeing created or destroyed; a task is allowed to change its own -\u003ecred\npointer with no synchronization, and changing -\u003ecred should only affect the\ncurrent syscall.\n\nsmack_file_send_sigiotask() was accessing both sets of credentials: First\ntsk-\u003ecred, then __task_cred(tsk).\n\nFix it, always access the objective credentials here.\n\nI have tested that this bug can lead to a KASAN-reported UAF of struct cred\nin smack_file_send_sigiotask(), and that this fix prevents the race."
    }
  ],
  "id": "CVE-2026-80928",
  "lastModified": "2026-10-19T09:17:23.777",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-11T20:18:56.513",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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