libceph: handle rbtree insertion error in decode_choose_args()

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Summary

CVECVE-2026-52954
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:05 UTC
Updated2026-06-29 06:16:30 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]

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: 0.005300000 probability, percentile 0.407390000 (date 2026-06-30)

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 5cf9c4a9959b6273675310d14a834ef14fbca37c c7bf7864e2924fa5508ac270b0e9364bc13d5a6c git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c f47430fc1f815e87406e2d3b4e476eff1bc7fd9b git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c 534ebc08df97c47d4c7596f336fa31ecbf91519c git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c 80c73bd1b2b04355d1d0c29be8ccbd25a380905d git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c 4d2b37abda9536808655830d683dc491d31741a8 git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3 git Not specified
CNA Linux Linux affected 5cf9c4a9959b6273675310d14a834ef14fbca37c d289478cfc0bcf81c7914200d6abdcb78bd04ded git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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