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Review reviewHigh

CVE-2026-46267

Linux Linux, linux kernel

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 Verifica...

CVSS
7.8
EPSS
0.12%
2.24% percentile
CISA KEV
Not listed
Published
2026.06.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.8

Vulnerability overview

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 Verifica...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 4a61cd6687fc6348d08724676d34e38160d6cf9b < c60f41022eaad2a1dafecd3ae6f249a3bd6d4b6e, >= 4a61cd6687fc6348d08724676d34e38160d6cf9b < a24a676329d40481b2331bfa1418a679577dfd3a, >= 4a61cd6687fc6348d08724676d34e38160d6cf9b < 77eef9f2eef045c3c37a3df82d3e661afb866b98, >= 4a61cd6687fc6348d08724676d34e38160d6cf9b < cf70cedce327833296ebe6043364d1e44b76a2ab, >= 4a61cd6687fc6348d08724676d34e38160d6cf9b < 276820278e9717cc7d4bb32381892dd3ddf418d4, >= 4a61cd6687fc6348d08724676d34e38160d6cf9b < 1cb97b1225450af3f7b728777929ba50c6a58ced, >= 4a61cd6687fc6348d08724676d34e38160d6cf9b < c9efde1e537baed7648a94022b43836a348a074f, >= 3.7, >= 3.7 < 5.15.202, >= 5.16 < 6.1.165, >= 6.2 < 6.6.128, >= 6.7 < 6.12.75, >= 6.13 < 6.18.14, >= 6.19 < 6.19.4
Fixed versions
5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2026-46267 — Linux Linux, linux kernel | SECUFOCUS NOW