FKIE_CVE-2026-43043

Vulnerability from fkie_nvd - Published: 2026-05-01 15:16 - Updated: 2026-05-01 15:24
Severity ?
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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_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\u0027s 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()."
    }
  ],
  "id": "CVE-2026-43043",
  "lastModified": "2026-05-01T15:24:14.893",
  "metrics": {},
  "published": "2026-05-01T15:16:50.563",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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