selinux: allow multiple opens of /sys/fs/selinux/policy

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Summary

CVECVE-2026-46302
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-08 17:16:48 UTC
Updated2026-06-08 17:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: selinux: allow multiple opens of /sys/fs/selinux/policy Currently there can only be a single open of /sys/fs/selinux/policy at any time. This allows any process to block any other process from reading the kernel policy. The original motivation seems to have been a mix of preventing an inconsistent view of the policy size and preventing userspace from allocating kernel memory without bound, but this is arguably equally bad. Eliminate the policy_opened flag and shrink the critical section that the policy mutex is held. While we are making changes here, drop a couple of extraneous BUG_ONs.

Risk And Classification

EPSS: 0.000240000 probability, percentile 0.072250000 (date 2026-06-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 714362f3779dfa453a78ced32396a72726962a41 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 a02cd6805562305f936e807da83e253b719dd965 git Not specified
CNA Linux Linux affected 7.0.7 semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/714362f3779dfa453a78ced32396a72726962a41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a02cd6805562305f936e807da83e253b719dd965 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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