accel/qaic: Handle DBC deactivation if the owner went away

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Summary

CVECVE-2026-43007
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:44 UTC
Updated2026-05-07 20:24:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: accel/qaic: Handle DBC deactivation if the owner went away When a DBC is released, the device sends a QAIC_TRANS_DEACTIVATE_FROM_DEV transaction to the host over the QAIC_CONTROL MHI channel. QAIC handles this by calling decode_deactivate() to release the resources allocated for that DBC. Since that handling is done in the qaic_manage_ioctl() context, if the user goes away before receiving and handling the deactivation, the host will be out-of-sync with the DBCs available for use, and the DBC resources will not be freed unless the device is removed. If another user loads and requests to activate a network, then the device assigns the same DBC to that network, QAIC will "indefinitely" wait for dbc->in_use = false, leading the user process to hang. As a solution to this, handle QAIC_TRANS_DEACTIVATE_FROM_DEV transactions that are received after the user has gone away.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000180000 probability, percentile 0.048290000 (date 2026-05-05)

Problem Types: CWE-415

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 129776ac2e38231fa9c02ce20e116c99de291666 2dd67966f39a2abf8ccb4865031c722e40e01b7f git Not specified
CNA Linux Linux affected 129776ac2e38231fa9c02ce20e116c99de291666 08021f2d4a557d6491e3bcc288e96425f50aa3cf git Not specified
CNA Linux Linux affected 129776ac2e38231fa9c02ce20e116c99de291666 f403094d9075d7c565a3d81002b781c325cb3c07 git Not specified
CNA Linux Linux affected 129776ac2e38231fa9c02ce20e116c99de291666 ee0180e77e6c8482644569632065411de844c515 git Not specified
CNA Linux Linux affected 129776ac2e38231fa9c02ce20e116c99de291666 2feec5ae5df785658924ab6bd91280dc3926507c git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ee0180e77e6c8482644569632065411de844c515 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2feec5ae5df785658924ab6bd91280dc3926507c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/08021f2d4a557d6491e3bcc288e96425f50aa3cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f403094d9075d7c565a3d81002b781c325cb3c07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2dd67966f39a2abf8ccb4865031c722e40e01b7f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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