# CVE-2026-80945

## Summary

- **CVE ID:** CVE-2026-80945
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 2026

## Description

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 Products

- Linux — Linux (2ec6761df889fdf896fde761abd447596dd8f8c2)
- Linux — Linux (6.8)
- Linux — Linux (0)
- Linux — Linux (6.18.51)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/fc933a4a419ba8a75da28666a018602c44846953)
- [CNA](https://git.kernel.org/stable/c/fcd86180ef78b0e41763faef7c6d2de7dfb50c1a)
- [CNA](https://git.kernel.org/stable/c/94a25930477113730372e0fa2985da4c5ac95c9a)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.47%
- **EPSS Percentile:** 39.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._