Bug 2541114 (CVE-2026-97590)

Summary: CVE-2026-97590 kernel: s390/crypto: Fix missing scrub of temp buffers with PAES algorithm
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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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Doc Text:
A flaw was found in the Linux kernel. This vulnerability leads to information disclosure during protected Advanced Encryption Standard (PAES) operations on s390 architectures. Because the kernel fails to clear temporary memory buffers after cryptographic processing, a local attacker could access residual memory to expose sensitive cryptographic data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description OSIDB Bzimport 2026-09-25 10:49:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

s390/crypto: Fix missing scrub of temp buffers with PAES algorithm

In function ctr_paes_do_crypt() there is a buffer used to process
remaining bytes < AES_BLOCK_SIZE. This buffer was not scrubbed and
thus could lead to expose of unwanted data. Rework the code to
explicitly scrub the buffer at the end of the function to avoid
exposure of maybe sensitive data.

In function __xts_2keys_prep_param() change the existing scrub to
clean the whole param block instead of just the key field.
Comment 1 gkamathe 2026-09-29 09:56:03 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97590.mbox