dma-buf: Fix silent overflow for phys vec to sgt

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98242
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:12 UTC
Updated2026-10-06 09:18:12 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dma-buf: Fix silent overflow for phys vec to sgt In case MMIO size is bigger than 4G and peer2peer DMA goes through host bridge, we trigger a code path that assigns the total linked IOVA (which is greater than 4G) to mapped_len. Previously, `mapped_len` was declared as 32-bit `unsigned int`. When accumulating `size_t` lengths, this leads to a silent wrap-around. This truncation causes truncated lengths to be passed to functions like `fill_sg_entry()`. Fix this by changing `mapped_len` to `size_t` (64-bit). While at it, fix similar potential overflow issues in `calc_sg_nents` by using `check_add_overflow()` for `nents` and using `unsigned int` for the loop iterator in `fill_sg_entry` to match.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3aa31a8bb11e47c0ff2b306988d1756b810c1c3c 6b98fd7106d4e486f432664893dcd4d6fa3a9693 git Not specified
CNA Linux Linux affected 3aa31a8bb11e47c0ff2b306988d1756b810c1c3c b344ca94e8cc85796f16ea25e2e5a8e0303fe813 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b344ca94e8cc85796f16ea25e2e5a8e0303fe813 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b98fd7106d4e486f432664893dcd4d6fa3a9693 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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