CVE-2025-38212
Linux Kernel IPC RCU Use-After-Free Vulnerability
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().
INFO
Published Date :
July 4, 2025, 2:15 p.m.
Last Modified :
July 8, 2025, 4:18 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2025-38212.
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 04, 2025
Action Type Old Value New Value Added 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(). Added Reference https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9 Added Reference https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c Added Reference https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884 Added Reference https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68 Added Reference https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d Added Reference https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057 Added Reference https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7 Added Reference https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38212 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-38212
weaknesses.