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

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-06-14 17:48
VLAI?
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 ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted 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)
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    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)
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          "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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            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46024",
    "datePublished": "2026-05-27T12:56:29.932Z",
    "dateReserved": "2026-05-13T15:03:33.093Z",
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    "state": "PUBLISHED"
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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