libceph: Reject monmaps advertising zero monitors
In the Linux kernel, the following vulnerability has been resolved: libceph: Reject monmaps advertising zero monitors A message of type CEPH_MSG_MON_MAP contains a monmap that is sent from a monitor to the client. This monmap contains information about the existing monitors in the cluster. Currently, a monmap indicating that there are zero monitors in the cluster is treated as valid. However, it is impossible to have zero monitors in the cluster and still receive a valid monmap from a monitor. Therefore, such a monmap must be corrupted and should be treated as invalid. Furthermore, a monmap with a monitor count of zero can subsequently crash the client when attempting to open a session with a monitor in __open_session(). This happens because the "BUG_ON(monc->monmap->num_mon < 1)" assertion in pick_new_mon() is triggered. This patch extends a check in ceph_monmap_decode() to also reject arriving mon_maps with num_mon == 0 rather than only with num_mon > CEPH_MAX_MON. [ idryomov: drop "log output for unusual values of num_mon" part ]
CVE-2026-68155
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-2026-68155
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": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "ba5f0015bfd376d764163045a61c17be75f44dae",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "caf082ef8609a6ac26159ce115f55ab7d00231a3",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "e3ccd4ecab09b22f507f49cb7ed9990c7158ceab",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "0591a15815b498be628a937146e44487d599ba33",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "cd0d41bc569632eaaeccde9d2a6bc919ec00c407",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "e67e8b694872c9bc66996040f9de9242f6236ed9",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "3b249546f59c3d6d3592c10657f82bc3f1faa07c",
"versionType": "git"
},
{
"status": "affected",
"version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
"lessThan": "40480eee361ed9676b3f844d532ac28b47251634",
"versionType": "git"
}
],
"programFiles": [
"net/ceph/mon_client.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.34",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ceph/mon_client.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68155
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41141 · Revision 1
- Added to Heist Feed
- Publisher date