net: tipc: fix refcount warning in tipc_aead_encrypt
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tipc: fix refcount warning in tipc_aead_encrypt syzbot reported a refcount warning [1] caused by calling get_net() on a network namespace that is being destroyed (refcount=0). This happens when a TIPC discovery timer fires during network namespace cleanup. The recently added get_net() call in commit e279024617134 ("net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done") attempts to hold a reference to the network namespace. However, if the namespace is already being destroyed, its refcount might be zero, leading to the use-after-free warning. Replace get_net() with maybe_get_net(), which safely checks if the refcount is non-zero before incrementing it. If the namespace is being destroyed, return -ENODEV early, after releasing the bearer reference. [1]: https://lore.kernel.org/all/[email protected]/T/#m12019cf9ae77e1954f666914640efa36d52704a2
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.10.238 to before 5.10.239; 5.15.185 to before 5.15.186; 6.1.141 to before 6.1.142; 6.6.93 to before 6.6.94; 6.12.31 to before 6.12.34; 6.14.9 to before 6.15 | 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15 | Patch available | CNA |
| Linux | Linux | 6.15 and later | 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16 | Patch available | CNA |
- Linux VendorLinux Affected 5.10.238 to before 5.10.239; 5.15.185 to before 5.15.186; 6.1.141 to before 6.1.142; 6.6.93 to before 6.6.94; 6.12.31 to before 6.12.34; 6.14.9 to before 6.15 Fixed in 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15 Patch available CNA
- Linux VendorLinux Affected 6.15 and later Fixed in 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.12.31 to before 6.12.34; 6.14.9 to before 6.15; 6.15.1 to before 6.15.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.10.238:*:*:*:*:*:*:* | 5.10.238 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15.185:*:*:*:*:*:*:* | 5.15.185 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1.141:*:*:*:*:*:*:* | 6.1.141 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.6.93:*:*:*:*:*:*:* | 6.6.93 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:* | 6.15 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.12.31 to before 6.12.34; 6.14.9 to before 6.15; 6.15.1 to before 6.15.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.10.238:*:*:*:*:*:*:* Versions 5.10.238 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15.185:*:*:*:*:*:*:* Versions 5.15.185 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1.141:*:*:*:*:*:*:* Versions 6.1.141 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.6.93:*:*:*:*:*:*:* Versions 6.6.93 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:* Versions 6.15 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15
- Fix · CNA Linux (Linux) Fixed in 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2025-38273
- 2026-10-03 Alias added: GHSA-r4r9-4cc8-c2cp
- 2026-11-07 Affected versions changed · Red Hat
References
Patch 7
- https://git.kernel.org/stable/c/445d59025d76d0638b03110f8791d5b89ed5162d
- https://git.kernel.org/stable/c/e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029
- https://git.kernel.org/stable/c/307391e8fe70401a6d39ecc9978e13c2c0cdf81f
- https://git.kernel.org/stable/c/acab7ca5ff19889b80a8ee7dec220ee1a96dede9
- https://git.kernel.org/stable/c/c762fc79d710d676b793f9d98b1414efe6eb51e6
- https://git.kernel.org/stable/c/9ff60e0d9974dccf24e89bcd3ee7933e538d929f
- https://git.kernel.org/stable/c/f29ccaa07cf3d35990f4d25028cc55470d29372b
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Sources
- CVE-2025-38273 · CVE Program
- CVE-2025-38273 · NVD
- FIRST EPSS
- GHSA-r4r9-4cc8-c2cp · GitHub Advisory Database · CC BY 4.0
- CVE-2025-38273 · Red Hat security data · CC BY 4.0
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