smack: fix cred UAF in smack_file_send_sigiotask()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80928
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:18:56 UTC
Updated2026-09-14 13:18:49 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001280000 probability, percentile 0.028190000 (date 2026-09-13)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 a512366d84e134a9eefc2cc40eeb6e80e2ec162c git Not specified
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 7c7fe043f3099d0d35002b248967f75e55345b93 git Not specified
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 f9c7b1f2b9d8f4176d2632743f51400855978ace git Not specified
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 b5bcf3adfa27279da4401ab8f1e1a706601a92be git Not specified
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 ed64aa505875a3b4defd504ee8e59e1949246a62 git Not specified
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 b791401bf389a1546a830d2b381ca60fe94c7870 git Not specified
CNA Linux Linux affected 3b11a1decef07c19443d24ae926982bc8ec9f4c0 fedc88e38ce979a720cd2de042578cb5df3dc8de git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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