by Kastro
Paper/Archive/CVE-2026-80945

CVE-2026-80945

Linux Linux — crypto: iaa - unmap dst before software fallback on decompress

EPSS 0.5%CVSS 9.1
critical.is priorityof 100
36
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 42.8.428 × 208.6No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: crypto: iaa - unmap dst before software fallback on decompress On a hardware analytics error, decompress retries through the software fallback, which writes req->dst with the CPU while it is still mapped DMA_FROM_DEVICE. With SWIOTLB active the later dma_unmap_sg() copies the stale bounce buffer over req->dst, corrupting the result. Unmap before the fallback runs. The async path unmaps inline; the sync path signals the retry with -EAGAIN so iaa_comp_adecompress() runs the fallback after unmapping.

Affected

ProductAffectedFixed inSource
Linux2ec6761df889fdf896fde761abd447596dd8f8c2 – < c0279e5ea2aad99d8b91f1a6579d751cc9eb2408c0279e5ea2aad99d8b91f1a6579d751cc9eb2408CNA
Linux2ec6761df889fdf896fde761abd447596dd8f8c2 – < fc933a4a419ba8a75da28666a018602c44846953fc933a4a419ba8a75da28666a018602c44846953CNA
Linux2ec6761df889fdf896fde761abd447596dd8f8c2 – < fcd86180ef78b0e41763faef7c6d2de7dfb50c1afcd86180ef78b0e41763faef7c6d2de7dfb50c1aCNA
Linux2ec6761df889fdf896fde761abd447596dd8f8c2 – < 94a25930477113730372e0fa2985da4c5ac95c9a94a25930477113730372e0fa2985da4c5ac95c9aCNA
Linux6.86.12.111CNA

Scores by source

Linux (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

refgit.kernel.org/stable/c/c0279e5ea2aad99d8b91f1a6579d751cc9eb2408refgit.kernel.org/stable/c/fc933a4a419ba8a75da28666a018602c44846953refgit.kernel.org/stable/c/fcd86180ef78b0e41763faef7c6d2de7dfb50c1arefgit.kernel.org/stable/c/94a25930477113730372e0fa2985da4c5ac95c9a