Bug 2464405 (CVE-2026-43033)

Summary: CVE-2026-43033 kernel: crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `authencesn` cryptographic module. When performing out-of-place decryption (where source and destination data buffers are different), the system incorrectly handles high-order sequence bits. This leads to improper data rearrangement before hashing, which could potentially affect the integrity of cryptographic operations.
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Description OSIDB Bzimport 2026-05-01 15:04:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption

When decrypting data that is not in-place (src != dst), there is
no need to save the high-order sequence bits in dst as it could
simply be re-copied from the source.

However, the data to be hashed need to be rearranged accordingly.


Thanks,
Comment 1 Keith Grant 2026-05-01 17:35:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050101-CVE-2026-43033-25c2@gregkh/T