CVE-2025-38212 Information

Jul 05, 2025 cve

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

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().

Reference

https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9 https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884 https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68 https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057 https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7 https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472

CNNVD-202507-443 (Published: 2025-07-04)

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