Linux kernel: SHDLC HCI UAF from timer/work race
CVE-2026-46267 Published on June 3, 2026
nfc: hci: shdlc: Stop timers and work before freeing context
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.
Products Associated with CVE-2026-46267
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Affected Versions
Linux:- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below c60f41022eaad2a1dafecd3ae6f249a3bd6d4b6e is affected.
- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below a24a676329d40481b2331bfa1418a679577dfd3a is affected.
- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below 77eef9f2eef045c3c37a3df82d3e661afb866b98 is affected.
- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below cf70cedce327833296ebe6043364d1e44b76a2ab is affected.
- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below 276820278e9717cc7d4bb32381892dd3ddf418d4 is affected.
- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below 1cb97b1225450af3f7b728777929ba50c6a58ced is affected.
- Version 4a61cd6687fc6348d08724676d34e38160d6cf9b and below c9efde1e537baed7648a94022b43836a348a074f is affected.
- Version 3.7 is affected.
- Before 3.7 is unaffected.
- Version 5.15.202, <= 5.15.* is unaffected.
- Version 6.1.165, <= 6.1.* is unaffected.
- Version 6.6.128, <= 6.6.* is unaffected.
- Version 6.12.75, <= 6.12.* is unaffected.
- Version 6.18.14, <= 6.18.* is unaffected.
- Version 6.19.4, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.