Description
In the Linux kernel, the following vulnerability has been resolved: ipc: fix to protect IPCS lookups using RCU syzbot reported that it discovered a use-after-free vulnerability, [0] [0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/ idr_for_each() is protected by rwsem, but this is not enough. If it is not protected by RCU read-critical region, when idr_for_each() calls radix_tree_node_free() through call_rcu() to free the radix_tree_node structure, the node will be freed immediately, and when reading the next node in radix_tree_for_each_slot(), the already freed memory may be read. Therefore, we need to add code to make sure that idr_for_each() is protected within the RCU read-critical region when we call it in shm_destroy_orphaned().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b34a6b1da371ed8af1221459a18c67970f7e3d53 to < 5f1e1573bf103303944fd7225559de5d8297539caffectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < b968ba8bfd9f90914957bbbd815413bf6a98eca7affectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < 74bc813d11c30e28fc5261dc877cca662ccfac68affectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < 78297d53d3878d43c1d627d20cd09f611fa4b91daffectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < 5180561afff8e0f029073c8c8117c95c6512d1f9affectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < 68c173ea138b66d7dd1fd980c9bc578a18e11884affectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < b0b6bf90ce2699a574b3683e22c44d0dcdd7a057affectedb34a6b1da371ed8af1221459a18c67970f7e3d53 to < d66adabe91803ef34a8b90613c81267b5ded1472affected
Linux Linux
Default version status: affected
3.1affected0 to < 3.1unaffected5.4.295 to ≤ 5.4.*unaffected5.10.239 to ≤ 5.10.*unaffected5.15.186 to ≤ 5.15.*unaffected6.1.142 to ≤ 6.1.*unaffected6.6.95 to ≤ 6.6.*unaffected6.12.35 to ≤ 6.12.*unaffected6.15.4 to ≤ 6.15.*unaffected6.16 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c ↗
- https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7 ↗
- https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68 ↗
- https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d ↗
- https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9 ↗
- https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884 ↗
- https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057 ↗
- https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗