CVE-2026-80912

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CVE-2026-80912

Summary: selinux: reject an unclaimed class value in security_get_classes()

Details: In the Linux kernel, the following vulnerability has been resolved: selinux: reject an unclaimed class value in security_get_classes() security_get_classes() sizes an array by p_classes.nprim and fills it at value - 1, so a class value the policy never defines leaves a NULL. sel_make_classes() passes every entry to sel_make_dir(), reaching the same d_alloc_name() dereference as the permission array. The class symbol table is allowed to be sparse (policydb_class_isvalid() exists to absorb that), but this getter builds its own array straight from the hash table and has no such predicate. Fail the lookup when a value went unclaimed instead of handing out the NULL. Conforming policies define every class they declare and are unaffected.

References: https://git.kernel.org/stable/c/099869e9343a5f8c22b58497f074b34f63cbf856, https://git.kernel.org/stable/c/22b05fec62c0fe9864cfceb52f7d0f3a34d9b1dd, https://git.kernel.org/stable/c/3480c081c23d559fd9a6921b76955664f2e95153, https://git.kernel.org/stable/c/841aea4d5a25e16273d04cd07a74142b4687e03b, https://git.kernel.org/stable/c/d2e7f7035d6f407119ba5467f7218cc4370844fc, https://git.kernel.org/stable/c/d8a10899ea3c84b80de72ca8ee9039e9a5156c9a, https://git.kernel.org/stable/c/e0285bb152211c00900136b66d4b420c14a59094, https://git.kernel.org/stable/c/f38a71868888285efc9c0ab5b032e23919c5a0a1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80912.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80912, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git