libceph: Fix potential out-of-bounds access in osdmap_decode()

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Summary

CVECVE-2026-52958
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:06 UTC
Updated2026-06-28 08:16:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in osdmap_decode() When decoding osd_state and osd_weight from an incoming osdmap in osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This can potentially result in an out-of-bounds memory access if the incoming message is corrupted such that the max_osd value exceeds the actual content of the osdmap message. This patch fixes the issue by changing the corresponding part in the ceph_decode_need() check to account for map->max_osd*sizeof(*map->osd_weight).

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005440000 probability, percentile 0.415370000 (date 2026-06-29)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 36a79759a288961b1ff28a68ec2d1f56f6848098 git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 3f2575bb7f955d42569d96c3e04fa958a0dcf4b4 git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 8713bbc4b2b9ad78f803978e54b7e49dd21bd9be git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 0d2dd7e6bb74fd7712aa73457a4a821906c6863a git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 e7187f33c02488697ec0d01d82bf7a3f8deaba8f git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 48df98d12b15360cd56af5c1f460307b340c1197 git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 ee933694645dac062d65fc2743f92bc06fa0db6b git Not specified
CNA Linux Linux affected dcbc919a5dc8c2629684a113a90c0b6fe10c3462 35d0ed82d03e5ee77ea4f31f20e29562a7721649 git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 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/e7187f33c02488697ec0d01d82bf7a3f8deaba8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f2575bb7f955d42569d96c3e04fa958a0dcf4b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d2dd7e6bb74fd7712aa73457a4a821906c6863a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee933694645dac062d65fc2743f92bc06fa0db6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8713bbc4b2b9ad78f803978e54b7e49dd21bd9be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35d0ed82d03e5ee77ea4f31f20e29562a7721649 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48df98d12b15360cd56af5c1f460307b340c1197 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36a79759a288961b1ff28a68ec2d1f56f6848098 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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