CVE-2026-46024High· 7.5▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
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.
Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 9ded62c302c0342efdb5eda3bf6e75720caad0dfLinux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < f101271fcf55d7eacfefd610b51ec65f46ba8118Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 4b2738b93edad661178340239de657d876b73d3dLinux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 927e4bd5692f2a4901808822981fb2c8d4456548Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 016bc663657366d386993f63eb31072eb45a2b77Linux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 8f2be7285941a33a9f72579a23b96392f83c758eLinux >= 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc < 5199c125d25aeae8615c4fc31652cc0fe624338eLinux 2.6.34Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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