rtase: fix double free of multi-frag skb on DMA map failure

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Summary

CVECVE-2026-74545
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:59 UTC
Updated2026-08-15 13:17:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: rtase: fix double free of multi-frag skb on DMA map failure In rtase_start_xmit(), when the head buffer DMA mapping fails after rtase_xmit_frags() has mapped all fragments, the error path clears the fragment descriptors with rtase_tx_clear_range(), which frees the skb through the last-frag slot and accounts tx_dropped. Control then falls through to the common error label, which frees the same skb a second time and counts it again. Return right after clearing the fragments when the skb owns frags; the no-frag case still drops through and frees the head skb once.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 4f09172aff5f73a5e914f4fbc0d00a1c2ea9f7cb git Not specified
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 db986098f30881fafcc752800aa3b13fd289c922 git Not specified
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 de691dc3227b061c4d0beba9f0128fe1ff33dd68 git Not specified
CNA Linux Linux affected d6e882b89fdf80be0ab4f914ec10f75215e49495 6fb7b769d6ed6d1d2e02af4a80e57a2477f35086 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4f09172aff5f73a5e914f4fbc0d00a1c2ea9f7cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de691dc3227b061c4d0beba9f0128fe1ff33dd68 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6fb7b769d6ed6d1d2e02af4a80e57a2477f35086 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db986098f30881fafcc752800aa3b13fd289c922 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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