Bug 2532217 (CVE-2026-80945)

Summary: CVE-2026-80945 kernel: crypto: iaa - unmap dst before software fallback on decompress
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's cryptography module, specifically within the Intel Analytics Accelerator (IAA) driver. When a hardware error occurs during data decompression, the system attempts to use a software-based fallback. However, due to improper handling of memory buffers during this fallback, particularly when the Software I/O Translation Lookaside Buffer (SWIOTLB) is active, the decompression process can corrupt the resulting data. This could lead to data integrity issues for a local user or process.
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Description OSIDB Bzimport 2026-09-11 21:27:16 UTC 
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.
Comment 1 Keith Grant 2026-09-14 15:23:18 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80945.mbox