selinux: use sk blob accessor in socket permission helpers

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Summary

CVECVE-2026-46104
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:25 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: selinux: use sk blob accessor in socket permission helpers SELinux socket state lives in the composite LSM socket blob. sock_has_perm() and nlmsg_sock_has_extended_perms() currently dereference sk->sk_security directly, which assumes the SELinux socket blob is at offset zero. In stacked configurations that assumption does not hold. If another LSM allocates socket blob storage before SELinux, these helpers may read the wrong blob and feed invalid SID and class values into AVC checks. Use selinux_sock() instead of accessing sk->sk_security directly.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d1d991efaf34606d500dcbd28bedc0666eeec8e2 d350fef4bc2467fe1bce15f7a20fe60e01ce41ad git Not specified
CNA Linux Linux affected d1d991efaf34606d500dcbd28bedc0666eeec8e2 7eca71f57f194c1638ebb7f4097d6be8fd04c101 git Not specified
CNA Linux Linux affected d1d991efaf34606d500dcbd28bedc0666eeec8e2 032e70aff025d7c519af9ab791cd084380619263 git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/032e70aff025d7c519af9ab791cd084380619263 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7eca71f57f194c1638ebb7f4097d6be8fd04c101 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d350fef4bc2467fe1bce15f7a20fe60e01ce41ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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