ipc: fix to protect IPCS lookups using RCU
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
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().
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.1 and later | 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4, 6.16 | Patch available | CNA |
- Linux VendorLinux Affected 3.1 and later Fixed in 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4, 6.16 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.1 to before 5.4.295; 5.5 to before 5.10.239; 5.11 to before 5.15.186; 5.16 to before 6.1.142; 6.2 to before 6.6.95; 6.7 to before 6.12.35; 6.13 to before 6.15.4 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.1 to before 5.4.295; 5.5 to before 5.10.239; 5.11 to before 5.15.186; 5.16 to before 6.1.142; 6.2 to before 6.6.95; 6.7 to before 6.12.35; 6.13 to before 6.15.4 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4, 6.16
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-38212
- 2026-10-03 Alias added: GHSA-6c9x-j9r2-vpw8
- 2026-10-16 CISA SSVC decision points changed
References
Patch 8
- 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
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2025-38212 · CVE Program
- CVE-2025-38212 · NVD
- FIRST EPSS
- GHSA-6c9x-j9r2-vpw8 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-38212 · Red Hat security data · CC BY 4.0
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