ceph: bound copied dentry name length in NFS export get_name
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().
CVE-2026-89652
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89652
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "19913b4eac4a230dccb548931358398f45dabe4c",
"lessThan": "a294064e0e0f81ea607b2f019e16888aa1b0a011",
"versionType": "git"
},
{
"status": "affected",
"version": "19913b4eac4a230dccb548931358398f45dabe4c",
"lessThan": "61d9f27b191b838b96b697ce0bfaee39a138243a",
"versionType": "git"
},
{
"status": "affected",
"version": "19913b4eac4a230dccb548931358398f45dabe4c",
"lessThan": "06fb5e623cdc2402d6bb29be94d9beb9a826ffec",
"versionType": "git"
},
{
"status": "affected",
"version": "19913b4eac4a230dccb548931358398f45dabe4c",
"lessThan": "e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6",
"versionType": "git"
},
{
"status": "affected",
"version": "19913b4eac4a230dccb548931358398f45dabe4c",
"lessThan": "eff8013c5a8916613c742ae5a2cc341cb605c0ae",
"versionType": "git"
}
],
"programFiles": [
"fs/ceph/export.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ceph/export.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89652
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #35146 · Revision 1
- Added to Heist Feed
- Publisher date