Vulnerability-Lookup

GHSA-FMW3-M5FG-W74X

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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

libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()

If a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both protocol and result, this is currently not treated as an error. In case of ac->negotiating == true and ac->protocol > 0, this leads to setting ac->protocol = 0 and ac->ops = NULL. Thereafter, the check for ac->protocol != protocol returns false, and init_protocol() is not called. Subsequently, ac->ops->handle_reply() is called, which leads to a null pointer dereference, because ac->ops is still NULL.

This patch changes the check for ac->protocol != protocol to !ac->protocol, as this also includes the case when the protocol was set to zero in the message. This causes the message to be treated as containing a bad auth protocol.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46024"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()\n\nIf a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both\nprotocol and result, this is currently not treated as an error. In case\nof ac-\u003enegotiating == true and ac-\u003eprotocol \u003e 0, this leads to setting\nac-\u003eprotocol = 0 and ac-\u003eops = NULL. Thereafter, the check for\nac-\u003eprotocol != protocol returns false, and init_protocol() is not\ncalled. Subsequently, ac-\u003eops-\u003ehandle_reply() is called, which leads to\na null pointer dereference, because ac-\u003eops is still NULL.\n\nThis patch changes the check for ac-\u003eprotocol != protocol to\n!ac-\u003eprotocol, as this also includes the case when the protocol was set\nto zero in the message. This causes the message to be treated as\ncontaining a bad auth protocol.",
  "id": "GHSA-fmw3-m5fg-w74x",
  "modified": "2026-05-27T15:33:21Z",
  "published": "2026-05-27T15:33:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46024"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46024 (GCVE-0-2026-46024)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-05-27 12:56

Title

libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply() If a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both protocol and result, this is currently not treated as an error. In case of ac->negotiating == true and ac->protocol > 0, this leads to setting ac->protocol = 0 and ac->ops = NULL. Thereafter, the check for ac->protocol != protocol returns false, and init_protocol() is not called. Subsequently, ac->ops->handle_reply() is called, which leads to a null pointer dereference, because ac->ops is still NULL. This patch changes the check for ac->protocol != protocol to !ac->protocol, as this also includes the case when the protocol was set to zero in the message. This causes the message to be treated as containing a bad auth protocol.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/4b2738b93edad6611…
https://git.kernel.org/stable/c/927e4bd5692f2a490…
https://git.kernel.org/stable/c/016bc663657366d38…
https://git.kernel.org/stable/c/8f2be7285941a33a9…
https://git.kernel.org/stable/c/5199c125d25aeae86…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4b2738b93edad661178340239de657d876b73d3d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 927e4bd5692f2a4901808822981fb2c8d4456548 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 016bc663657366d386993f63eb31072eb45a2b77 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8f2be7285941a33a9f72579a23b96392f83c758e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5199c125d25aeae8615c4fc31652cc0fe624338e (git) Affected: 0 , < 6.6.140 (semver) Affected: 0 , < 6.12.86 (semver) Affected: 0 , < 6.18.27 (semver) Affected: 0 , < 7.0.4 (semver)
Linux	Linux	Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/auth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4b2738b93edad661178340239de657d876b73d3d",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5199c125d25aeae8615c4fc31652cc0fe624338e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThan": "6.12.86",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "7.0.4",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "vulnerable": true
                },
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                },
                {
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                  "versionEndExcluding": "7.1-rc1",
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                }
              ],
              "negate": false,
              "operator": "OR"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()\n\nIf a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both\nprotocol and result, this is currently not treated as an error. In case\nof ac-\u003enegotiating == true and ac-\u003eprotocol \u003e 0, this leads to setting\nac-\u003eprotocol = 0 and ac-\u003eops = NULL. Thereafter, the check for\nac-\u003eprotocol != protocol returns false, and init_protocol() is not\ncalled. Subsequently, ac-\u003eops-\u003ehandle_reply() is called, which leads to\na null pointer dereference, because ac-\u003eops is still NULL.\n\nThis patch changes the check for ac-\u003eprotocol != protocol to\n!ac-\u003eprotocol, as this also includes the case when the protocol was set\nto zero in the message. This causes the message to be treated as\ncontaining a bad auth protocol."
        }
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        "dateUpdated": "2026-05-27T12:56:29.932Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77"
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        {
          "url": "https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e"
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      ],
      "title": "libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()",
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        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46024",
    "datePublished": "2026-05-27T12:56:29.932Z",
    "dateReserved": "2026-05-13T15:03:33.093Z",
    "dateUpdated": "2026-05-27T12:56:29.932Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-FMW3-M5FG-W74X

CVE-2026-46024 (GCVE-0-2026-46024)

Tags

Sightings

Nomenclature