PT-2026-36460 · Linux · Linux

Published 2026-05-01 · Updated 2026-05-01 · CVE-2026-43043

Mitre

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

crypto: af-alg - fix NULL pointer dereference in scatterwalk

The AF ALG interface fails to unmark the end of a Scatter/Gather List (SGL) when chaining a new af alg tsgl structure. If a sendmsg() fills an SGL exactly to MAX SGL ENTS, the last entry is marked as the end. A subsequent sendmsg() allocates a new SGL and chains it, but fails to clear the end marker on the previous SGL's last data entry.

This causes the crypto scatterwalk to hit a premature end, returning NULL on sg next() and leading to a kernel panic during dereference.

Fix this by explicitly unmarking the end of the previous SGL when performing sg chain() in af alg alloc tsgl().

Related Identifiers

CVE-2026-43043

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-43043 · Security Note
• https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948 · Note
• https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04 · Note
• https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb · Note
• https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75 · Note
• https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49 · Note
• https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a · Note
• https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7 · Note
• https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395 · Note