- 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: ceph: bound copied dentry name length in NFS export get_name ceph_get_name() copies the MDS-supplied name into the caller's NAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len) and then writes name[rinfo->dname_len] = 0, without checking dname_len against NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply with dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies rde->name / rde->name_len the same unchecked way. Impact: a malicious or compromised Ceph MDS overflows the NAME_MAX name buffer in a client's NFS-export get_name path, a slab out-of-bounds write reported by KASAN. Reachable when a CephFS mount is re-exported over NFS. Add ceph_export_copy_name(), which rejects lengths above NAME_MAX with -ENAMETOOLONG before the copy, and use it in both ceph_get_name() and __get_snap_name().
Timeline
ID reserved
By Linux
Published
- 49 days later
· 49 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 (11 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 19913b4eac4a230dccb548931358398f45dabe4c – < aadfe588ad8032ea99bda259ae7b8d42854f8193
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < 3cb09301c30909a7935e9de41f98eeb5ef7e4d40
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < dff3d84d14142ea43ad61ef5d6b4de05ba16ba42
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < a294064e0e0f81ea607b2f019e16888aa1b0a011
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < 61d9f27b191b838b96b697ce0bfaee39a138243a
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < 06fb5e623cdc2402d6bb29be94d9beb9a826ffec
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6
- affected 19913b4eac4a230dccb548931358398f45dabe4c – < eff8013c5a8916613c742ae5a2cc341cb605c0ae
- affected 3.15
- unaffected < 3.15
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- 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
References8
- https://git.kernel.org/stable/c/aadfe588ad8032ea99bda259ae7b8d42854f8193 (opens in a new tab)
- https://git.kernel.org/stable/c/3cb09301c30909a7935e9de41f98eeb5ef7e4d40 (opens in a new tab)
- https://git.kernel.org/stable/c/dff3d84d14142ea43ad61ef5d6b4de05ba16ba42 (opens in a new tab)
- https://git.kernel.org/stable/c/a294064e0e0f81ea607b2f019e16888aa1b0a011 (opens in a new tab)
- https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a (opens in a new tab)
- https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec (opens in a new tab)
- https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6 (opens in a new tab)
- https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae (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-2026-76564 (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-2026-89652)Record last updated .