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THREATINT
PUBLISHED

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/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().

Reserved 2025-04-16 | Published 2025-07-04 | Updated 2025-07-04 | Assigner Linux

Product status

Default status
unaffected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before 5f1e1573bf103303944fd7225559de5d8297539c
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before b968ba8bfd9f90914957bbbd815413bf6a98eca7
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before 74bc813d11c30e28fc5261dc877cca662ccfac68
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before 78297d53d3878d43c1d627d20cd09f611fa4b91d
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before 5180561afff8e0f029073c8c8117c95c6512d1f9
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before 68c173ea138b66d7dd1fd980c9bc578a18e11884
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before b0b6bf90ce2699a574b3683e22c44d0dcdd7a057
affected

b34a6b1da371ed8af1221459a18c67970f7e3d53 before d66adabe91803ef34a8b90613c81267b5ded1472
affected

Default status
affected

3.1
affected

Any version before 3.1
unaffected

5.4.295
unaffected

5.10.239
unaffected

5.15.186
unaffected

6.1.142
unaffected

6.6.95
unaffected

6.12.35
unaffected

6.15.4
unaffected

6.16-rc1
unaffected

References

git.kernel.org/...c/5f1e1573bf103303944fd7225559de5d8297539c

git.kernel.org/...c/b968ba8bfd9f90914957bbbd815413bf6a98eca7

git.kernel.org/...c/74bc813d11c30e28fc5261dc877cca662ccfac68

git.kernel.org/...c/78297d53d3878d43c1d627d20cd09f611fa4b91d

git.kernel.org/...c/5180561afff8e0f029073c8c8117c95c6512d1f9

git.kernel.org/...c/68c173ea138b66d7dd1fd980c9bc578a18e11884

git.kernel.org/...c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057

git.kernel.org/...c/d66adabe91803ef34a8b90613c81267b5ded1472

cve.org (CVE-2025-38212)

nvd.nist.gov (CVE-2025-38212)

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