CVE-2026-43033
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Linux Kernel Out-of-Place Decryption Crypto Vulnerability

Publication date: 2026-05-01

Last updated on: 2026-05-08

Assigner: kernel.org

Description
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,
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Meta Information
Published
2026-05-01
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43033
EUVD
EUVD-2026-26632
Affected Vendors & Products
Showing 13 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.13 (inc) to 6.18.22 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.204 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.170 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.137 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.85 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.12 (exc)
linux linux_kernel From 4.3 (inc) to 5.10.254 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Impact Analysis

This vulnerability relates to the Linux kernel's crypto subsystem, specifically the authencesn module. It involves incorrect handling of high-order sequence bits during out-of-place decryption, which could potentially lead to incorrect cryptographic operations or data integrity issues when decrypting data.

If exploited or left unpatched, this could impact systems relying on the Linux kernel's cryptographic functions for secure data processing, potentially leading to data corruption or weakening of cryptographic assurances.

Executive Summary

This vulnerability exists in the Linux kernel's crypto module, specifically in the authencesn component. It relates to the handling of out-of-place decryption, where the source and destination buffers are different (src != dst). The issue is that the high-order sequence bits (hiseq) were being placed at the end of the destination buffer unnecessarily. Since these bits can be re-copied from the source, saving them in the destination is not needed. However, the data that is hashed needs to be rearranged properly to avoid issues.

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