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().
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 7 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=2.6.38,<5.10.253
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- (no CPE)
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75nvdPatch
- git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948nvdPatch
- git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7nvdPatch
- git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcbnvdPatch
- git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395nvdPatch
- git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49nvdPatch
- git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309anvdPatch
- git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04nvdPatch
News mentions
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