CVE-2026-89652Critical· 9.8▾ MidnightIn 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, rin…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7.4
none → high
— → 9.8
none → critical
9.8 → 7.4
critical → high
7.4 → 9.8
high → critical
9.8 → 7
critical → high
0.2% → 0.7%
7 → 9.8
high → critical
Last analysed / modified upstream
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().
Linux >= 19913b4eac4a230dccb548931358398f45dabe4c < a294064e0e0f81ea607b2f019e16888aa1b0a011Linux >= 19913b4eac4a230dccb548931358398f45dabe4c < 61d9f27b191b838b96b697ce0bfaee39a138243aLinux >= 19913b4eac4a230dccb548931358398f45dabe4c < 06fb5e623cdc2402d6bb29be94d9beb9a826ffecLinux >= 19913b4eac4a230dccb548931358398f45dabe4c < e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6Linux >= 19913b4eac4a230dccb548931358398f45dabe4c < eff8013c5a8916613c742ae5a2cc341cb605c0aeLinux 3.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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