CVE-2026-80558libceph: Avoid using invalid osd indices from primary_temp
- 9.8CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% 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: 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 ]
Timeline
ID reserved
By Linux
Published
- 51 days later
· 51 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < 505fc50b8ff8e687b7e3ef6866269dea27366224
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < 1c705fe8e59c6b16f48964973fb23c8ec4735b73
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < dfe1877d351b99eb1b1a62a3fc2d174220e88e20
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < e2ffeec85201b2bb748e99e12539ee1b92f62796
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < 6799d4a916ffcb3d450d8440f9fe0f0862f768d6
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < 4f392fec075562dc93bb0c69f37423ca2af9b48f
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < e009c5f0ad634c62f5c48a41f1f3c019ecf52555
- affected 5e8d4d36bf23bb7baf027c479d54395840219928 – < 3660b98d1204b419f6a77e9a295f148dcf38d042
- affected 3.15
- unaffected < 3.15
- unaffected 5.10.266 – ≤ 5.10.*
- unaffected 5.15.217 – ≤ 5.15.*
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.153 – ≤ 6.6.*
- unaffected 6.12.105 – ≤ 6.12.*
- unaffected 6.18.46 – ≤ 6.18.*
- unaffected 7.1.10 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224 (opens in a new tab)
- https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73 (opens in a new tab)
- https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20 (opens in a new tab)
- https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796 (opens in a new tab)
- https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6 (opens in a new tab)
- https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f (opens in a new tab)
- https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555 (opens in a new tab)
- https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042 (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-2026-66473 (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)
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[](https://cveledger.app/cve/CVE-2026-80558)Record last updated .