- 7.5HighCVSS base score
- 0.61%Exploitation in 30 daysEPSS · top 50% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In 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 ]
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.61% · top 50% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected f628d799972799023d32c2542bb2639eb8c4f84e – < 94ae5145c520618802b0a24c047dcd5f05835db8
- affected f628d799972799023d32c2542bb2639eb8c4f84e – < 058ffa81f9440c5b4714685611cf697fd3739ec9
- affected f628d799972799023d32c2542bb2639eb8c4f84e – < 2571b35883268a266554e80d368e67fdfea7fb9d
- affected f628d799972799023d32c2542bb2639eb8c4f84e – < 201db408872ca12cf09e36bf0f560138c3dcfa1c
- affected f628d799972799023d32c2542bb2639eb8c4f84e – < 9ec08b7499a62c6d4afa93d36ab47a43fcad57d1
- affected 6.6
- unaffected < 6.6
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/94ae5145c520618802b0a24c047dcd5f05835db8 (opens in a new tab)
- https://git.kernel.org/stable/c/058ffa81f9440c5b4714685611cf697fd3739ec9 (opens in a new tab)
- https://git.kernel.org/stable/c/2571b35883268a266554e80d368e67fdfea7fb9d (opens in a new tab)
- https://git.kernel.org/stable/c/201db408872ca12cf09e36bf0f560138c3dcfa1c (opens in a new tab)
- https://git.kernel.org/stable/c/9ec08b7499a62c6d4afa93d36ab47a43fcad57d1 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76569 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89657)Record last updated .