CVE-2026-43043
Description
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().
How to fix
- linux linux_kernel5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 or later
- git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75
- git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948
- git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7
- git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb
- git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395
- git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49
- git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a
- git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.38 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.168, 6.2 ≤ v < 6.6.134, 6.7 ≤ v < 6.12.81, 6.13 ≤ v < 6.18.22, 6.19 ≤ v < 6.19.12, 7.0 | 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 |
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