CVE-2026-46267

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.

References

• https://git.kernel.org/stable/c/1cb97b1225450af3f7b728777929ba50c6a58ced
• https://git.kernel.org/stable/c/276820278e9717cc7d4bb32381892dd3ddf418d4
• https://git.kernel.org/stable/c/77eef9f2eef045c3c37a3df82d3e661afb866b98
• https://git.kernel.org/stable/c/a24a676329d40481b2331bfa1418a679577dfd3a
• https://git.kernel.org/stable/c/c60f41022eaad2a1dafecd3ae6f249a3bd6d4b6e