libceph: Avoid using invalid osd indices from primary_temp

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80558
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 15:17:10 UTC
Updated2026-08-27 06:17:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libceph: Avoid using invalid osd indices from primary_temp A corrupted osdmap received from a Ceph monitor or OSD may contain osd indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts that don't exist, i.e., that are greater than max_osd or smaller than CEPH_HOMELESS_OSD (-1). These indices are used to create the up and acting set in ceph_pg_to_up_acting_osds(), called from calc_target(). While most of these osd indices are checked, the one from primary_temp is not. Subsequently, this may lead to calc_target() returning this (potentially invalid) index as target osd for a (linger) request. Because the osd_state, osd_weight, and osd_addr arrays only contain max_osd entries (with indices 0 to max_osd -1), this leads to out-of-bounds accesses when trying to read values from these arrays. This patch fixes the issue by adding a check to get_temp_osds(), so that only valid osd indices from primary_temp are used, and it falls back to using the primary from pg_temp or the up set if it is invalid. [ idryomov: changelog ]

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005210000 probability, percentile 0.420410000 (date 2026-08-27)

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 505fc50b8ff8e687b7e3ef6866269dea27366224 git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 1c705fe8e59c6b16f48964973fb23c8ec4735b73 git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 dfe1877d351b99eb1b1a62a3fc2d174220e88e20 git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 e2ffeec85201b2bb748e99e12539ee1b92f62796 git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 6799d4a916ffcb3d450d8440f9fe0f0862f768d6 git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 4f392fec075562dc93bb0c69f37423ca2af9b48f git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 e009c5f0ad634c62f5c48a41f1f3c019ecf52555 git Not specified
CNA Linux Linux affected 5e8d4d36bf23bb7baf027c479d54395840219928 3660b98d1204b419f6a77e9a295f148dcf38d042 git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 5.10.266 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.217 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.184 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.153 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.105 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.46 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.10 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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