CVE-2026-46267 nfc: hci: shdlc: Stop timers and work before freeing context
A use-after-free vulnerability in the Linux kernel NFC SHDLC driver allows attackers to execute arbitrary code or escalate privileges via race conditions during teardown.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46267?
CVE-2026-46267 is a high-severity use after free vulnerability in Linux kernel, published on 3 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nfc: hci: shdlc: Stop timers and work before freeing context
llc_shdlc_deinit() purges SHDLC skb queues and frees the llc_shdlc structure while its timers and state machine work may still be active.
Timer callbacks can schedule sm_work, and sm_work accesses SHDLC state and the skb queues. If teardown happens in parallel with a queued/running work item, it can lead to UAF and other shutdown races.
Stop all SHDLC timers and cancel sm_work synchronously before purging the queues and freeing the context.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Weakness: CWE-416
Which versions are affected by CVE-2026-46267?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46267?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-46267 being exploited?
There is no known exploitation of CVE-2026-46267 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-46267, DEBIAN-CVE-2026-46267, GHSA-c9pp-c247-8xgh, ROOT-OS-DEBIAN-11-CVE-2026-46267, ROOT-OS-UBUNTU-2204-CVE-2026-46267, UBUNTU-CVE-2026-46267.