Vulnerability-Lookup

GHSA-4MMG-5V66-42GX

Vulnerability from github – Published: 2026-03-25 12:30 – Updated: 2026-03-25 12:30

Details

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: Compare MACs in constant time

To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23364"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-25T11:16:35Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Compare MACs in constant time\n\nTo prevent timing attacks, MAC comparisons need to be constant-time.\nReplace the memcmp() with the correct function, crypto_memneq().",
  "id": "GHSA-4mmg-5v66-42gx",
  "modified": "2026-03-25T12:30:24Z",
  "published": "2026-03-25T12:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23364"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23364 (GCVE-0-2026-23364)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-03-25 10:27

Title

ksmbd: Compare MACs in constant time

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/cd52a0e3096595370…
	https://git.kernel.org/stable/c/307afccb751f54224…
	https://git.kernel.org/stable/c/2cdc56ed67615ba09…
	https://git.kernel.org/stable/c/93c0a22fec914ec4b…
	https://git.kernel.org/stable/c/f4588b85efd6007d4…
	https://git.kernel.org/stable/c/c5794709bc9105935…

Impacted products

Vendor

Product

Version

Linux

Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < cd52a0e309659537048a864211abc3ea4c5caa63 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 307afccb751f542246bd5dc68a2c1ffe1a78418c (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 2cdc56ed67615ba0921383a688f24415ebe065f3 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 93c0a22fec914ec4b697e464895a0f594e29fb28 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < f4588b85efd6007d46b80aa1b9fb746628ffb3dc (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < c5794709bc9105935dbedef8b9cf9c06f2b559fa (git)

Linux

Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/Kconfig",
            "fs/smb/server/auth.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cd52a0e309659537048a864211abc3ea4c5caa63",
              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
            {
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            },
            {
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              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/Kconfig",
            "fs/smb/server/auth.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                },
                {
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                },
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                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Compare MACs in constant time\n\nTo prevent timing attacks, MAC comparisons need to be constant-time.\nReplace the memcmp() with the correct function, crypto_memneq()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:27:46.960Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c"
        },
        {
          "url": "https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa"
        }
      ],
      "title": "ksmbd: Compare MACs in constant time",
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  "cveMetadata": {
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    "datePublished": "2026-03-25T10:27:46.960Z",
    "dateReserved": "2026-01-13T15:37:46.002Z",
    "dateUpdated": "2026-03-25T10:27:46.960Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-4MMG-5V66-42GX

CVE-2026-23364 (GCVE-0-2026-23364)

Tags

Sightings

Nomenclature