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CVE-2025-38212: ipc: fix to protect IPCS lookups using RCU

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/[email protected]/

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().

Classification

CVE ID: CVE-2025-38212

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 7.52% (scored less or equal to compared to others)

EPSS Date: 2025-07-10 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-38212
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

Timeline