Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED checks In nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket state is LLCP_CLOSED, the code correctly calls release_sock() and nfc_llcp_sock_put() but fails to return. Execution falls through to the remainder of the function, which calls release_sock() and nfc_llcp_sock_put() again. This results in a double release_sock() and a refcount underflow via double nfc_llcp_sock_put(), leading to a use-after-free. Add the missing return statements after the LLCP_CLOSED branches in both functions to prevent the fall-through.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.3, < 6.6.136 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbfPatch
- https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82cPatch
- https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2Patch
- https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abfPatch
- https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6Patch
- https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9Patch
FAQ
What is CVE-2026-31629?
CVE-2026-31629 is a vulnerability with a CVSS score of 8.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED checks In nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket state is ...
How severe is CVE-2026-31629?
CVE-2026-31629 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31629?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.