Answer in brief
CVE-2026-68155 records a High severity (CVSS 7.5) vulnerability in libceph: Reject monmaps advertising zero monitors. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0591a15815b498be628a937146e44487d599ba33 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cd0d41bc569632eaaeccde9d2a6bc919ec00c407 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e67e8b694872c9bc66996040f9de9242f6236ed9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3b249546f59c3d6d3592c10657f82bc3f1faa07c || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40480eee361ed9676b3f844d532ac28b47251634 || >=0 <6.6.148 || >=0 <6.12.101 || >=0 <6.18.42 || >=0 <7.1.6 | 0591a15815b498be628a937146e44487d599ba33, cd0d41bc569632eaaeccde9d2a6bc919ec00c407, e67e8b694872c9bc66996040f9de9242f6236ed9, 3b249546f59c3d6d3592c10657f82bc3f1faa07c, 40480eee361ed9676b3f844d532ac28b47251634, 6.6.148, 6.12.101, 6.18.42, 7.1.6 |
| Linux/Linuxgeneric | >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <0591a15815b498be628a937146e44487d599ba33 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <cd0d41bc569632eaaeccde9d2a6bc919ec00c407 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <e67e8b694872c9bc66996040f9de9242f6236ed9 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <3b249546f59c3d6d3592c10657f82bc3f1faa07c || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <40480eee361ed9676b3f844d532ac28b47251634 | 0591a15815b498be628a937146e44487d599ba33, cd0d41bc569632eaaeccde9d2a6bc919ec00c407, e67e8b694872c9bc66996040f9de9242f6236ed9, 3b249546f59c3d6d3592c10657f82bc3f1faa07c, 40480eee361ed9676b3f844d532ac28b47251634 |
| Linux/Linuxgeneric | 2.6.34 | Not reported |
| Linux/Linuxgeneric | >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <caf082ef8609a6ac26159ce115f55ab7d00231a3 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <e3ccd4ecab09b22f507f49cb7ed9990c7158ceab || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <0591a15815b498be628a937146e44487d599ba33 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <cd0d41bc569632eaaeccde9d2a6bc919ec00c407 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <e67e8b694872c9bc66996040f9de9242f6236ed9 || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <3b249546f59c3d6d3592c10657f82bc3f1faa07c || >=ba75bb98cfb93b62c54af25bf67ff90857264bbe <40480eee361ed9676b3f844d532ac28b47251634 | caf082ef8609a6ac26159ce115f55ab7d00231a3, e3ccd4ecab09b22f507f49cb7ed9990c7158ceab, 0591a15815b498be628a937146e44487d599ba33, cd0d41bc569632eaaeccde9d2a6bc919ec00c407, e67e8b694872c9bc66996040f9de9242f6236ed9, 3b249546f59c3d6d3592c10657f82bc3f1faa07c, 40480eee361ed9676b3f844d532ac28b47251634 |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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 ]
Quoted source text, attributed separately from HOL analysis.