جزئیات آسیب‌پذیری

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().

• 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