{"id":"CVE-2026-43043","title":"crypto: af-alg - fix NULL pointer dereference in scatterwalk","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af-alg - fix NULL pointer dereference in scatterwalk\n\nThe AF_ALG interface fails to unmark the end of a Scatter/Gather List (SGL)\nwhen chaining a new af_alg_tsg…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < f48d3dd99199180cf37d6253550c55e86372309a","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < f9acceae7b004956851fd4268edf9f518a9bce04","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7195350fb78538c25cd790d703f8f2c73ee0d395","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 00cbdec17c15d024a1c5002c7365df7624a18a75","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7","Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 62397b493e14107ae82d8b80938f293d95425bcb","Linux 2.6.38"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:27:04.710209Z"},"published":"2026-05-01","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:32:28.084Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43043","references":[{"url":"https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a"},{"url":"https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04"},{"url":"https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395"},{"url":"https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49"},{"url":"https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948"},{"url":"https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75"},{"url":"https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7"},{"url":"https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb"}],"tags":["cve.org"],"epss":0.00114,"epssPercentile":0.01499,"ingestedAt":"2026-11-06T15:54:04.032Z","slug":"CVE-2026-43043","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af-alg - fix NULL pointer dereference in scatterwalk\n\nThe AF_ALG interface fails to unmark the end of a Scatter/Gather List (SGL)\nwhen chaining a new af_alg_tsgl structure. If a sendmsg() fills an SGL\nexactly to MAX_SGL_ENTS, the last entry is marked as the end. A subsequent\nsendmsg() allocates a new SGL and chains it, but fails to clear the end\nmarker on the previous SGL's last data entry.\n\nThis causes the crypto scatterwalk to hit a premature end, returning NULL\non sg_next() and leading to a kernel panic during dereference.\n\nFix this by explicitly unmarking the end of the previous SGL when\nperforming sg_chain() in af_alg_alloc_tsgl().\n\n## Affected\n\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < f48d3dd99199180cf37d6253550c55e86372309a`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < f9acceae7b004956851fd4268edf9f518a9bce04`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7195350fb78538c25cd790d703f8f2c73ee0d395`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 00cbdec17c15d024a1c5002c7365df7624a18a75`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7`\n- `Linux >= 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 < 62397b493e14107ae82d8b80938f293d95425bcb`\n- `Linux 2.6.38`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}