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CVE-2026-46024

Full vulnerability record from the local CVENow database.

Description

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
HIGH
CVSS score
7.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-27 14:17:20.890000
Last modified
2026-10-19 20:18:24.050000
View original CVE JSON 
{
  "id": "CVE-2026-46024",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-27T14:17:20.890",
  "lastModified": "2026-10-19T20:18:24.050",
  "vulnStatus": "Modified",
  "cveTags": [],
  "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->negotiating == true and ac->protocol > 0, this leads to setting\nac->protocol = 0 and ac->ops = NULL. Thereafter, the check for\nac->protocol != protocol returns false, and init_protocol() is not\ncalled. Subsequently, ac->ops->handle_reply() is called, which leads to\na null pointer dereference, because ac->ops is still NULL.\n\nThis patch changes the check for ac->protocol != protocol to\n!ac->protocol, 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."
    }
  ],
  "affected": [
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      "affectedData": [
        {
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          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
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          ],
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          "programFiles": [
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              "versionType": "original_commit_for_fix",
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  "metrics": {
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          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
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    ],
    "ssvcV203": [
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        "ssvcData": {
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          "role": "CISA Coordinator",
          "version": "2.0.3"
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "value": "CWE-476"
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  "configurations": [
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}