libceph: Use u32 for non-negative values in ceph_monmap_decode()

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Summary

CVECVE-2026-43405
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:52 UTC
Updated2026-05-11 08:16:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in ceph_monmap_decode() This patch fixes unnecessary implicit conversions that change signedness of blob_len and num_mon in ceph_monmap_decode(). Currently blob_len and num_mon are (signed) int variables. They are used to hold values that are always non-negative and get assigned in ceph_decode_32_safe(), which is meant to assign u32 values. Both variables are subsequently used as unsigned values, and the value of num_mon is further assigned to monmap->num_mon, which is of type u32. Therefore, both variables should be of type u32. This is especially relevant for num_mon. If the value read from the incoming message is very large, it is interpreted as a negative value, and the check for num_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to allocate a very large chunk of memory for monmap, which will most likely fail. In this case, an unnecessary attempt to allocate memory is performed, and -ENOMEM is returned instead of -EINVAL.

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: 0.000240000 probability, percentile 0.070400000 (date 2026-05-10)

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 a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c ee5588e2bc41acb73f6676c0520420c107cd0140 git Not specified
CNA Linux Linux affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c 86f7060cd638d6eb042e8ed780fb83a59ca0dcb3 git Not specified
CNA Linux Linux affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c 5f2806684b05bd24d05c091083b8e2517ba8ffac git Not specified
CNA Linux Linux affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c b268984ae88cb0dcd7a8e8263962c748448e26e8 git Not specified
CNA Linux Linux affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace git Not specified
CNA Linux Linux affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c 08bc6173fd611ad5a40f472bf5f15b92aea0fe40 git Not specified
CNA Linux Linux affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c 770444611f047dbfd4517ec0bc1b179d40c2f346 git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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