Bug 2464424 (CVE-2026-43044)

Summary:	CVE-2026-43044 kernel: crypto: caam - fix DMA corruption on long hmac keys
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's `crypto: caam` module. When processing HMAC (Keyed-Hash Message Authentication Code) keys longer than the block size, the memory allocated for the key copy was not correctly aligned for Direct Memory Access (DMA) operations. This oversight could lead to DMA corruption, potentially causing the hashed key to corrupt adjacent memory. Such corruption could result in system instability or data integrity issues.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-01 15:06:06 UTC

In the Linux kernel, the following vulnerability has been resolved:

crypto: caam - fix DMA corruption on long hmac keys

When a key longer than block size is supplied, it is copied and then
hashed into the real key.  The memory allocated for the copy needs to
be rounded to DMA cache alignment, as otherwise the hashed key may
corrupt neighbouring memory.

The rounding was performed, but never actually used for the allocation.
Fix this by replacing kmemdup with kmalloc for a larger buffer,
followed by memcpy.

Comment 1 Keith Grant 2026-05-01 18:17:04 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050104-CVE-2026-43044-36a8@gregkh/T