In 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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://git.kernel.org/stable/c/714362f3779dfa453a78ced32396a72726962a41 Patch
- https://git.kernel.org/stable/c/a02cd6805562305f936e807da83e253b719dd965 Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 4
- Cpes+3 CPE criteria (now 3)NVD modified 2026-10-21 13:19
- StatusPublished → ModifiedNVD modified 2026-10-21 13:19
- CVSS5.5 (v3.1, CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)NVD modified 2026-10-21 13:19
- First seenunscored · linuxNVD modified 2026-10-21 12:41
Affected (CPE criteria) 3
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
References 5
- https://git.kernel.org/stable/c/0ed712134a3db0075bfe9a0f8536c48728ec745e
- https://git.kernel.org/stable/c/714362f3779dfa453a78ced32396a72726962a41 Patch
- https://git.kernel.org/stable/c/a02cd6805562305f936e807da83e253b719dd965 Patch
- https://git.kernel.org/stable/c/c24d2e190b955baf3a95e05d34b192f61bd201b3
- https://git.kernel.org/stable/c/d8cafd0226d5df682d1f4ea978a4318fe3a11210