ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
In the Linux kernel, the following vulnerability has been resolved: ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode MDSMap export_targets entries are monitor controlled. check_new_map() uses each entry as a bit number in a fixed stack bitmap, so a rank outside the protocol namespace can make set_bit() write past the end of the array. Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not validate against possible_max_rank here because maps may legitimately reference ranks beyond a temporarily reduced max_mds.
CVE-2026-89653
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-2026-89653
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": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe",
"versionType": "git"
},
{
"status": "affected",
"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "8c823bbab3c24e657469a84db96902ba82d4e8bb",
"versionType": "git"
},
{
"status": "affected",
"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "c4addccd05bacbef2144b4db14853d0308a218ac",
"versionType": "git"
},
{
"status": "affected",
"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "736adee11af36e407ed902264f8b2fb5cf94b62f",
"versionType": "git"
},
{
"status": "affected",
"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "4d298880f82c42383b36946bafde7ccf4d804c9b",
"versionType": "git"
},
{
"status": "affected",
"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "96c3f5fbb0d5386e7111426f047f98cec4586674",
"versionType": "git"
},
{
"status": "affected",
"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c",
"lessThan": "aedc9053d909508a5f56c3f49f885fc030df4730",
"versionType": "git"
}
],
"programFiles": [
"fs/ceph/mdsmap.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"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/mdsmap.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89653
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #35147 · Revision 1
- Added to Heist Feed
- Publisher date