Buffer Overflow Fix in Linux Kernel Crypto API

Publication date: 2026-05-06

Last updated on: 2026-05-20

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Fix page reassignment overflow in af_alg_pull_tsgl When page reassignment was added to af_alg_pull_tsgl the original loop wasn't updated so it may try to reassign one more page than necessary. Add the check to the reassignment so that this does not happen. Also update the comment which still refers to the obsolete offset argument.

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Meta Information

Published

2026-05-06

Last Modified

2026-05-20

Generated

2026-07-06

AI Q&A

2026-05-06

EPSS Evaluated

2026-07-05

NVD

CVE-2026-43078

EUVD

EUVD-2026-27567

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	4.14
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	7.0
linux	linux_kernel	From 6.13 (inc) to 6.18.24 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.14 (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 4.14.1 (inc) to 5.10.254 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's crypto subsystem, specifically in the af_alg module. It involves a flaw in the function af_alg_pull_tsgl where a page reassignment overflow can occur. When page reassignment was introduced, the original loop controlling the reassignment was not updated properly, causing it to potentially reassign one more page than necessary. This could lead to unexpected behavior or memory handling issues. The fix involved adding a check to prevent this overflow and updating related comments.

Impact Analysis

The vulnerability could cause improper memory page reassignment in the Linux kernel's crypto module, which might lead to memory corruption or instability in the system. This could potentially be exploited to cause crashes or other unintended behavior in applications relying on the affected crypto functionality.

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