In the Linux kernel, the following vulnerability has been resolved: nfc: hci: shdlc: Stop timers and work before freeing context llc_shdlc_deinit()… (CVE-2026-46267)
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.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel NFC SHDLC driver occurs because the llc_shdlc_deinit() function purges SHDLC skb queues and frees the llc_shdlc structure while timers and state machine work (sm_work) may still be active. Since timer callbacks can schedule sm_work, which accesses SHDLC state and skb queues, concurrent teardown and work execution can cause use-after-free (UAF) and shutdown race conditions. The fix involves stopping all SHDLC timers and synchronously canceling sm_work before purging queues and freeing the context. This issue was identified by the Linux Verification Center using SVACE.
Potential Impact
Successful exploitation can lead to use-after-free conditions and race conditions during shutdown, potentially causing memory corruption and system instability. The CVSS vector indicates local attack vector with low complexity and no user interaction, resulting in high confidentiality, integrity, and availability impact.
Mitigation Recommendations
A fix is available in updated Linux kernel versions that stop timers and cancel work before freeing the SHDLC context. Users should upgrade to kernel versions equal to or newer than the fixed releases corresponding to the affected Ubuntu versions. Patch status is confirmed by the presence of fixed versions in the affectedVersions field. No additional mitigation is indicated.
In the Linux kernel, the following vulnerability has been resolved: nfc: hci: shdlc: Stop timers and work before freeing context llc_shdlc_deinit()… (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.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email 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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel NFC SHDLC driver occurs because the llc_shdlc_deinit() function purges SHDLC skb queues and frees the llc_shdlc structure while timers and state machine work (sm_work) may still be active. Since timer callbacks can schedule sm_work, which accesses SHDLC state and skb queues, concurrent teardown and work execution can cause use-after-free (UAF) and shutdown race conditions. The fix involves stopping all SHDLC timers and synchronously canceling sm_work before purging queues and freeing the context. This issue was identified by the Linux Verification Center using SVACE.
Potential Impact
Successful exploitation can lead to use-after-free conditions and race conditions during shutdown, potentially causing memory corruption and system instability. The CVSS vector indicates local attack vector with low complexity and no user interaction, resulting in high confidentiality, integrity, and availability impact.
Mitigation Recommendations
A fix is available in updated Linux kernel versions that stop timers and cancel work before freeing the SHDLC context. Users should upgrade to kernel versions equal to or newer than the fixed releases corresponding to the affected Ubuntu versions. Patch status is confirmed by the presence of fixed versions in the affectedVersions field. No additional mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46267
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5b60fe2d1edb114c85a14a
Added to database: 07/18/2026, 11:18:22 UTC
Last enriched: 07/30/2026, 13:53:17 UTC
Last updated: 07/31/2026, 21:28:59 UTC
Views: 3
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