Vulnerability-Lookup

FKIE_CVE-2026-46024

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-06-17 10:52

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34

JSON

To clipboard

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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."
    }
  ],
  "id": "CVE-2026-46024",
  "lastModified": "2026-06-17T10:52:55.147",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "type": "Secondary"
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  "published": "2026-05-27T14:17:20.890",
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          "lang": "en",
          "value": "CWE-476"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-08-05 12:29

Title

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

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6665 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/9ded62c302c0342ef…
https://git.kernel.org/stable/c/f101271fcf55d7eac…
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: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 9ded62c302c0342efdb5eda3bf6e75720caad0df (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < f101271fcf55d7eacfefd610b51ec65f46ba8118 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 4b2738b93edad661178340239de657d876b73d3d (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 927e4bd5692f2a4901808822981fb2c8d4456548 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 016bc663657366d386993f63eb31072eb45a2b77 (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 8f2be7285941a33a9f72579a23b96392f83c758e (git) Affected: 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc , < 5199c125d25aeae8615c4fc31652cc0fe624338e (git)
Linux	Linux	Affected: 2.6.34 Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) 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 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/auth.c"
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              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code processes a CEPH_MSG_AUTH_REPLY received from a remote Ceph monitor over TCP; the libceph client reaches monitors across routed networks, so the attacker (rogue monitor or MITM) operates remotely.\nAC:L - The attacker fully controls the reply message contents and sends protocol=0/result=0 during the negotiation it controls; the crash is deterministic with no race or unobservable memory-layout dependency.\nPR:N - The crafted reply is processed during the authentication handshake before the monitor\u0027s identity is verified, and a remote server/MITM needs no privileges on the victim client.\nUI:N - Once a CephFS/RBD client is connected, monitor connections and reconnections (and the negotiation state) occur automatically, so no user action is required at attack time.\nS:U - The crash occurs within the kernel itself with no crossing of a security boundary into another authority such as a hypervisor or other VM.\nC:N - A NULL pointer dereference yields no information disclosure; no attacker-controlled memory is read or leaked.\nI:N - The NULL dereference does not modify any kernel data and provides no write primitive.\nA:H - Dereferencing the NULL ac-\u003eops triggers a kernel oops/panic, crashing the system \u2014 a remote denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:11.187Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df"
        },
        {
          "url": "https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548"
        },
        {
          "url": "https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e"
        }
      ],
      "title": "libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()",
      "x_generator": {
        "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": "2026-08-05T12:29:11.187Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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