EXPLOIT/ALERT Back to feed

Linux vulnerability

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.

Published 11 Sep 2026Updated 13 Sep 20263 sources
CVSS 9.1
Overview Sources History

What happened

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 versions

Linux: 2ec6761df889fdf896fde761abd447596dd8f8c2 through before fc933a4a419ba8a75da28666a018602c44846953 (git); 2ec6761df889fdf896fde761abd447596dd8f8c2 through before fcd86180ef78b0e41763faef7c6d2de7dfb50c1a (git); 2ec6761df889fdf896fde761abd447596dd8f8c2 through before 94a25930477113730372e0fa2985da4c5ac95c9a (git); 6.8 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

  • Apply vendor-provided updates or mitigations.
  • Review affected product exposure and access logs.

Public PoC references

No public PoC reference has passed the current publication threshold.

CorrectionsReport an issue