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

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Summary

CVECVE-2026-46024
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:20 UTC
Updated2026-05-30 11:17:18 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000440000 probability, percentile 0.140470000 (date 2026-05-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc 4b2738b93edad661178340239de657d876b73d3d git Not specified
CNA Linux Linux affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc 927e4bd5692f2a4901808822981fb2c8d4456548 git Not specified
CNA Linux Linux affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc 016bc663657366d386993f63eb31072eb45a2b77 git Not specified
CNA Linux Linux affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc 8f2be7285941a33a9f72579a23b96392f83c758e git Not specified
CNA Linux Linux affected 4e7a5dcd1bbab6560fbc8ada29a840e7a20ed7bc 5199c125d25aeae8615c4fc31652cc0fe624338e git Not specified
CNA Linux Linux affected 2.6.34 Not specified
CNA Linux Linux unaffected 2.6.34 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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