dma-buf/dma-resv: check if the new fence is really later

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-49935
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-18 11:15:20 UTC
Updated2026-08-04 10:18:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dma-buf/dma-resv: check if the new fence is really later Previously when we added a fence to a dma_resv object we always assumed the the newer than all the existing fences. With Jason's work to add an UAPI to explicit export/import that's not necessary the case any more. So without this check we would allow userspace to force the kernel into an use after free error. Since the change is very small and defensive it's probably a good idea to backport this to stable kernels as well just in case others are using the dma_resv object in the same way.

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: 0.001480000 probability, percentile 0.044900000 (date 2026-08-05)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Operating System Linux Linux Kernel 6.0 rc1 All All
Operating System Linux Linux Kernel 6.0 rc2 All All
Operating System Linux Linux Kernel 6.0 rc3 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 27836b641c1bf693c96c627388497b4e0f57441b c4c798fe98adceb642050819cb57cbc8f5c27870 git Not specified
CNA Linux Linux affected 27836b641c1bf693c96c627388497b4e0f57441b a3f7c10a269d5b77dd5822ade822643ced3057f0 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 5.19.8 5.19.* semver Not specified
CNA Linux Linux unaffected 6.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c4c798fe98adceb642050819cb57cbc8f5c27870 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a3f7c10a269d5b77dd5822ade822643ced3057f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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