CVE-2025-38212
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]:…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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().
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9Patch
- https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539cPatch
- https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884Patch
- https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68Patch
- https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91dPatch
- https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057Patch
- https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7Patch
- https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.