CVE-2026-89652ceph: bound copied dentry name length in NFS export get_name
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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().
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 19913b4eac4a230dccb548931358398f45dabe4c before a294064e0e0f81ea607b2f019e16888aa1b0a011; 19913b4eac4a230dccb548931358398f45dabe4c builds before 61d9f27b191b838b96b697ce0bfaee39a138243a; 19913b4eac4a230dccb548931358398f45dabe4c builds before 06fb5e623cdc2402d6bb29be94d9beb9a826ffec; from 19913b4eac4a230dccb548931358398f45dabe4c before e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6; from 19913b4eac4a230dccb548931358398f45dabe4c before eff8013c5a8916613c742ae5a2cc341cb605c0ae | CNA record |
References
- https://git.kernel.org/stable/c/a294064e0e0f81ea607b2f019e16888aa1b0a011
- https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a
- https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec
- https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6
- https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.