dma-buf/dma-resv: check if the new fence is really later (CVE-2022-49935) | HOL Guard CVE

High · CVSS 7.8CVE-2022-49935

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

Answer in brief

CVE-2022-49935 records a High severity (CVSS 7.8) vulnerability in dma-buf/dma-resv: check if the new fence is really later. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 18, 2025Updated Aug 5, 2026Source checked Sep 19, 2026First seen by HOL Aug 4, 2026Material review Aug 5, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.0:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.0:rc2::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.0:rc3::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=27836b641c1bf693c96c627388497b4e0f57441b <c4c798fe98adceb642050819cb57cbc8f5c27870 \|\| >=27836b641c1bf693c96c627388497b4e0f57441b <a3f7c10a269d5b77dd5822ade822643ced3057f0	c4c798fe98adceb642050819cb57cbc8f5c27870, a3f7c10a269d5b77dd5822ade822643ced3057f0
Linux/Linuxgeneric	5.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c4c798fe98adceb642050819cb57cbc8f5c27870 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 18, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 4, 2026

Sources and claim methodology

Upstream source description

In 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.

Quoted source text, attributed separately from HOL analysis.