Medium 5.5Published May 1, 2026

CVE-2026-43043crypto: af-alg - fix NULL pointer dereference in scatterwalk

Updated under an hour ago (Oct 27, 2026, 2:30 PM ET)

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Exploited in the last 30 days

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().

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before f48d3dd99199180cf37d6253550c55e86372309a; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before f9acceae7b004956851fd4268edf9f518a9bce04; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 7195350fb78538c25cd790d703f8f2c73ee0d395; 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 builds before 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948; 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 builds before 00cbdec17c15d024a1c5002c7365df7624a18a75; 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 builds before 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 62397b493e14107ae82d8b80938f293d95425bcb	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.38 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a	patch
https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04	patch
https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395	patch
https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49	patch
https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948	patch
https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75	patch
https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7	patch
https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.