libceph: validate OSD extent maps before cursor advance

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89657
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:51 UTC
Updated2026-09-11 20:19:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libceph: validate OSD extent maps before cursor advance net/ceph/osd_client.c:osd_sparse_read() validates that the sparse-read data length matches the summed extent lengths, but it does not validate that each OSD-supplied extent is monotonic and lies inside the original request range. A malformed authenticated OSD reply can advertise a far-forward nonzero extent offset with a matching data length and make the client advance the message-data cursor beyond the request buffer. This reaches the BUG_ON(!*length) assertion in ceph_msg_data_next() from the client receive path. Impact: A malicious or compromised authenticated Ceph OSD peer can crash a kernel Ceph client via a malformed sparse-read reply. Reject sparse extent maps that overflow, move backwards, overlap, or extend outside the original sparse-read request before advancing the cursor. [ idryomov: perform sparse_extent_map_valid() check a bit earlier, in CEPH_SPARSE_READ_DATA_LEN instead of CEPH_SPARSE_READ_DATA_PRE state ]

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.099720000 (date 2026-09-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f628d799972799023d32c2542bb2639eb8c4f84e 058ffa81f9440c5b4714685611cf697fd3739ec9 git Not specified
CNA Linux Linux affected f628d799972799023d32c2542bb2639eb8c4f84e 2571b35883268a266554e80d368e67fdfea7fb9d git Not specified
CNA Linux Linux affected f628d799972799023d32c2542bb2639eb8c4f84e 201db408872ca12cf09e36bf0f560138c3dcfa1c git Not specified
CNA Linux Linux affected f628d799972799023d32c2542bb2639eb8c4f84e 9ec08b7499a62c6d4afa93d36ab47a43fcad57d1 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9ec08b7499a62c6d4afa93d36ab47a43fcad57d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/201db408872ca12cf09e36bf0f560138c3dcfa1c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/058ffa81f9440c5b4714685611cf697fd3739ec9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2571b35883268a266554e80d368e67fdfea7fb9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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