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CVE-2026-46024

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.209, 6.1.175, 6.6.140, 6.12.86, 6.18.27, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in 9ded62c302c0342efdb5eda3bf6e75720caad0df; From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in f101271fcf55d7eacfefd610b51ec65f46ba8118; From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in 4b2738b93edad661178340239de657d876b73d3d; From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in 927e4bd5692f2a4901808822981fb2c8d4456548; From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in 016bc663657366d386993f63eb31072eb45a2b77; From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in 8f2be7285941a33a9f72579a23b96392f83c758e; From 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc · fixed in 5199c125d25aeae8615c4fc31652cc0fe624338e

  • Linux Linux

    2.6.34

  • KernelLinux

    From 2.6.34 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.140; From 6.7.0 · fixed in 6.12.86; From 6.13.0 · fixed in 6.18.27; From 6.19.0 · fixed in 7.0.4

References 7

git.kernel.org