{"id":"CVE-2026-46024","title":"libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 9ded62c302c0342efdb5eda3bf6e75720caad0df","Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < f101271fcf55d7eacfefd610b51ec65f46ba8118","Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 4b2738b93edad661178340239de657d876b73d3d","Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 927e4bd5692f2a4901808822981fb2c8d4456548","Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 016bc663657366d386993f63eb31072eb45a2b77","Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 8f2be7285941a33a9f72579a23b96392f83c758e","Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 5199c125d25aeae8615c4fc31652cc0fe624338e","Linux 2.6.34"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:18:54.853796Z"},"published":"2026-05-27","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:48.793Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46024","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"}],"tags":["cve.org"],"epss":0.007,"epssPercentile":0.52216,"ingestedAt":"2026-10-16T17:24:46.703Z","slug":"CVE-2026-46024","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 9ded62c302c0342efdb5eda3bf6e75720caad0df`\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < f101271fcf55d7eacfefd610b51ec65f46ba8118`\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 4b2738b93edad661178340239de657d876b73d3d`\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 927e4bd5692f2a4901808822981fb2c8d4456548`\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 016bc663657366d386993f63eb31072eb45a2b77`\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 8f2be7285941a33a9f72579a23b96392f83c758e`\n- `Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 5199c125d25aeae8615c4fc31652cc0fe624338e`\n- `Linux 2.6.34`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}