CVE-2026-43043 (GCVE-0-2026-43043)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-01 14:15
VLAI?
Title
crypto: af-alg - fix NULL pointer dereference in scatterwalk
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().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < f48d3dd99199180cf37d6253550c55e86372309a (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < f9acceae7b004956851fd4268edf9f518a9bce04 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 7195350fb78538c25cd790d703f8f2c73ee0d395 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 00cbdec17c15d024a1c5002c7365df7624a18a75 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7 (git)
Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 62397b493e14107ae82d8b80938f293d95425bcb (git)
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    Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "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()."
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    "dateReserved": "2026-05-01T14:12:55.979Z",
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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