Vulnerability-Lookup

GHSA-87MG-5J2R-6P32

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-01 15:30

Details

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().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43043"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:50Z",
    "severity": null
  },
  "details": "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": "GHSA-87mg-5j2r-6p32",
  "modified": "2026-05-01T15:30:37Z",
  "published": "2026-05-01T15:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43043"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-01 14:15

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

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/f48d3dd99199180cf…
	https://git.kernel.org/stable/c/f9acceae7b0049568…
	https://git.kernel.org/stable/c/7195350fb78538c25…
	https://git.kernel.org/stable/c/7cdf2c6381b21ab5c…
	https://git.kernel.org/stable/c/44eafa39363e8d5df…
	https://git.kernel.org/stable/c/00cbdec17c15d024a…
	https://git.kernel.org/stable/c/4b03ab0a587ec57eb…
	https://git.kernel.org/stable/c/62397b493e14107ae…

Impacted products

Vendor

Product

Version

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)

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)

Show details on NVD website

JSON

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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "crypto/af_alg.c"
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          "vendor": "Linux",
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              "status": "affected",
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            {
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              "versionType": "git"
            },
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              "status": "affected",
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            },
            {
              "lessThan": "2.6.38",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        {
          "url": "https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb"
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      "title": "crypto: af-alg - fix NULL pointer dereference in scatterwalk",
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  "cveMetadata": {
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    "datePublished": "2026-05-01T14:15:39.576Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-87MG-5J2R-6P32

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

Tags

Sightings

Nomenclature