CVE-2023-52502: net: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn()

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-02 · updated 2026-08-04
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: net: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn() Sili Luo reported a race in nfc_llcp_sock_get(), leading to UAF. Getting a reference on the socket found in a lookup while holding a lock should happen before releasing the lock. nfc_llcp_sock_get_sn() has a similar problem. Finally nfc_llcp_recv_snl() needs to make sure the socket found by nfc_llcp_sock_from_sn() does not disappear.

Affected products

Linux kernel: from 3.6 before 4.19.297; from 4.20 before 5.4.259; from 5.5 before 5.10.199; from 5.11 before 5.15.136; from 5.16 before 6.1.59; from 6.2 before 6.5.8 — fixed in 4.19.297, 5.10.199, 5.15.136, 5.4.259, 6.1.59, 6.5.8

How to fix

Upgrade to a fixed version: Linux kernel 4.19.297, 5.10.199, 5.15.136, 5.4.259. Check the vendor advisory for mitigations.

References

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