CVE-2026-43043

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < f48d3dd99199180cf37d6253550c55e86372309aaffected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < f9acceae7b004956851fd4268edf9f518a9bce04affected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7195350fb78538c25cd790d703f8f2c73ee0d395affected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49affected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948affected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 00cbdec17c15d024a1c5002c7365df7624a18a75affected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7affected
LinuxLinux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 62397b493e14107ae82d8b80938f293d95425bcbaffected
LinuxLinux2.6.38affected
LinuxLinux0 < 2.6.38unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References