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8.8 High

CVE-2026-31629 In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED…

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.

Affected products and versions

Product Affected versions Fixed in
Linux 7.1 earliest → < 7.1 7.1
Linux 7.0 earliest → < 7.0.1 7.0.1
Linux 6.19 earliest → < 6.19.14 6.19.14
Linux 6.18 earliest → < 6.18.24 6.18.24
Linux 6.12 earliest → < 6.12.83 6.12.83
Linux 6.6 earliest → < 6.6.136 6.6.136
Linux 6.1 earliest → < 6.1.175 6.1.175
Linux 5.15 earliest → < 5.15.209 5.15.209
Linux 5.10 earliest → < 5.10.258 5.10.258
Show the 2 other branches
Product Affected versions Fixed in
Linux 3.3 No fix stated
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Versions not published

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