CVE-2026-68155
Detail
Received This CVE record has recently been published to the CVE List and has been included within the NVD dataset.
Description
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 ]
Metrics
CVSS Version 4.0
CVSS Version 3.x
CVSS Version 2.0
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
NVD assessment
not yet provided.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
NVD assessment
not yet provided.
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Change History
5 change records found show changes
CVE Modified by kernel.org
8/19/2026 1:20:32 PM
Action
Type
Old Value
New Value
Added
Reference
https://git.kernel.org/stable/c/caf082ef8609a6ac26159ce115f55ab7d00231a3
Added
Reference
https://git.kernel.org/stable/c/e3ccd4ecab09b22f507f49cb7ed9990c7158ceab
Changed
Affected
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"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","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","lessThan":"2.6.34","versionType":"semver","status":"unaffected"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
Record truncated, showing 2048 of 2215 characters.
View Entire Change Record [{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"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","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","lessThan":"2.6.34","versionType":"semver","status":"unaffected"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThan
CVE Modified by kernel.org
8/18/2026 3:16:50 AM
Action
Type
Old Value
New Value
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Affected
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"0591a15815b498be628a937146e44487d599ba33","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cd0d41bc569632eaaeccde9d2a6bc919ec00c407","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e67e8b694872c9bc66996040f9de9242f6236ed9","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3b249546f59c3d6d3592c10657f82bc3f1faa07c","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"40480eee361ed9676b3f844d532ac28b47251634","versionType":"git","status":"affected"},{"version":"0","lessThan":"6.6.148","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.12.101","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.18.42","versionType":"semver","status":"affected"},{"version":"0","lessThan":"7.1.6","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"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","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","lessThan":"2.6.34","versionType":"semver","status":"unaffected"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
CVE Modified by kernel.org
8/17/2026 1:18:15 AM
Action
Type
Old Value
New Value
Changed
Affected
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"0591a15815b498be628a937146e44487d599ba33","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cd0d41bc569632eaaeccde9d2a6bc919ec00c407","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e67e8b694872c9bc66996040f9de9242f6236ed9","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3b249546f59c3d6d3592c10657f82bc3f1faa07c","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"40480eee361ed9676b3f844d532ac28b47251634","versionType":"git","status":"affected"},{"version":"0","lessThan":"6.6.148","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.12.101","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.18.42","versionType":"semver","status":"affected"},{"version":"0","lessThan":"7.1.6","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc5","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"0591a15815b498be628a937146e44487d599ba33","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cd0d41bc569632eaaeccde9d2a6bc919ec00c407","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e67e8b694872c9bc66996040f9de9242f6236ed9","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3b249546f59c3d6d3592c10657f82bc3f1faa07c","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"40480eee361ed9676b3f844d532ac28b47251634","versionType":"git","status":"affected"},{"version":"0","lessThan":"6.6.148","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.12.101","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.18.42","versionType":"semver","status":"affected"},{"version":"0","lessThan":"7.1.6","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
CVE Modified by kernel.org
8/13/2026 7:17:20 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
New CVE Received from kernel.org
8/10/2026 9:20:01 AM
Action
Type
Old Value
New Value
Added
Description
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 ]
Added
Reference
https://git.kernel.org/stable/c/0591a15815b498be628a937146e44487d599ba33
Added
Reference
https://git.kernel.org/stable/c/3b249546f59c3d6d3592c10657f82bc3f1faa07c
Added
Reference
https://git.kernel.org/stable/c/40480eee361ed9676b3f844d532ac28b47251634
Added
Reference
https://git.kernel.org/stable/c/cd0d41bc569632eaaeccde9d2a6bc919ec00c407
Added
Reference
https://git.kernel.org/stable/c/e67e8b694872c9bc66996040f9de9242f6236ed9
Added
Affected
[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"0591a15815b498be628a937146e44487d599ba33","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cd0d41bc569632eaaeccde9d2a6bc919ec00c407","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e67e8b694872c9bc66996040f9de9242f6236ed9","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3b249546f59c3d6d3592c10657f82bc3f1faa07c","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"40480eee361ed9676b3f844d532ac28b47251634","versionType":"git","status":"affected"},{"version":"0","lessThan":"6.6.148","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.12.101","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.18.42","versionType":"semver","status":"affected"},{"version":"0","lessThan":"7.1.6","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"6.6.148","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc5","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]
Quick Info
CVE Dictionary Entry: CVE-2026-68155 NVD
Published Date: 08/10/2026 NVD
Last Modified: 08/19/2026
Source: kernel.org
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