CVE-2026-80928

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93
https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c
https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be
https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870
https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62
https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace
https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:18

Updated : 2026-09-14 13:18

NVD link : CVE-2026-80928

Mitre link : CVE-2026-80928

CVE.ORG link : CVE-2026-80928

JSON object : View

Products Affected

No product.

CWE

No CWE.

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a task is allowed to change its own ->cred\npointer with no synchronization, and changing ->cred should only affect the\ncurrent syscall.\n\nsmack_file_send_sigiotask() was accessing both sets of credentials: First\ntsk->cred, 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."}], "lastModified": "2026-09-14T13:18:49.050", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}