CVE-2023-3863: Use-after-free in nfc_llcp_find_loca in net/nfc/llcp_core.c

Severity: medium (CVSS 4.1 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: 2023-07-24 · updated 2026-06-17
Weakness: CWE-416

Description

A use-after-free flaw was found in nfc_llcp_find_local in net/nfc/llcp_core.c in NFC in the Linux kernel. This flaw allows a local user with special privileges to impact a kernel information leak issue.

Affected products

Debian Linux: 10.0, 11.0, 12.0
Linux kernel: before 6.5 — fixed in 6.5

How to fix

Upgrade to a fixed version: Linux kernel 6.5. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2023-3863
https://bugzilla.redhat.com/show_bug.cgi?id=2225126
https://github.com/torvalds/linux/commit/6709d4b7bc2e079241fdef15d1160581c5261c10
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://security.netapp.com/advisory/ntap-20240202-0002/
https://www.debian.org/security/2023/dsa-5480
https://www.debian.org/security/2023/dsa-5492
https://access.redhat.com/security/cve/CVE-2023-3863
https://bugzilla.redhat.com/show_bug.cgi?id=2225126
https://github.com/torvalds/linux/commit/6709d4b7bc2e079241fdef15d1160581c5261c10
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://security.netapp.com/advisory/ntap-20240202-0002/

Get alerted when CVE-2023-3863 or the next vulnerability affects your stack