Bug 2536657 (CVE-2026-93161)

Summary:	CVE-2026-93161 kernel: crypto: qat - clear AES key schedule from stack
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	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
Whiteboard:
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Doc Text:	A flaw was found in the Linux kernel's crypto: qat module. The `qat_alg_xts_reverse_key()` function expands sensitive Advanced Encryption Standard (AES) key material on the stack. This key material is not properly cleared and can remain in the stack frame, potentially allowing a local attacker to access it. This could lead to the disclosure of cryptographic keys.	Story Points:	---
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-17 19:03:05 UTC

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

crypto: qat - clear AES key schedule from stack

qat_alg_xts_reverse_key() expands the forward XTS AES key on the stack.
That schedule contains key material and can remain in the stack frame.

Clear the temporary crypto_aes_ctx with memzero_explicit() after the copy.

Comment 1 gkamathe 2026-09-18 22:28:40 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93161.mbox