CVE-2022-49935 Information

Jun 19, 2025 cve

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.

Reference

https://git.kernel.org/stable/c/a3f7c10a269d5b77dd5822ade822643ced3057f0 https://git.kernel.org/stable/c/c4c798fe98adceb642050819cb57cbc8f5c27870

CNNVD-202506-2221 (Published: 2025-06-18)

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