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CVE-2026-68155— libceph: Reject monmaps advertising zero monitors

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 6.6.148之前版本、6.12.101之前版本、6.18.42之前版本和7.1.6之前版本存在安全漏洞，该漏洞源于对monmap中监视器数量验证不足，零监视器的monmap会触发断言，可能导致客户端崩溃。

CVSS 7.5 · High EPSS 0.67% · P49

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux ba75bb98cfb93b62c54af25bf67ff90857264bbe< caf082ef8609a6ac26159ce115f55ab7d00231a3 affected
ba75bb98cfb93b62c54af25bf67ff90857264bbe< e3ccd4ecab09b22f507f49cb7ed9990c7158ceab affected
ba75bb98cfb93b62c54af25bf67ff90857264bbe< 0591a15815b498be628a937146e44487d599ba33 affected
ba75bb98cfb93b62c54af25bf67ff90857264bbe< cd0d41bc569632eaaeccde9d2a6bc919ec00c407 affected
ba75bb98cfb93b62c54af25bf67ff90857264bbe< e67e8b694872c9bc66996040f9de9242f6236ed9 affected
ba75bb98cfb93b62c54af25bf67ff90857264bbe< 3b249546f59c3d6d3592c10657f82bc3f1faa07c affected
ba75bb98cfb93b62c54af25bf67ff90857264bbe< 40480eee361ed9676b3f844d532ac28b47251634 affected
2.6.34 affected
… +8 more rows
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I. Basic Information for CVE-2026-68155

Vulnerability Information
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Vulnerability Title
libceph: Reject monmaps advertising zero monitors
Source: CVE Program / CVE List V5
Vulnerability 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 ]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 6.6.148之前版本、6.12.101之前版本、6.18.42之前版本和7.1.6之前版本存在安全漏洞，该漏洞源于对monmap中监视器数量验证不足，零监视器的monmap会触发断言，可能导致客户端崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ba75bb98cfb93b62c54af25bf67ff90857264bbe ~ caf082ef8609a6ac26159ce115f55ab7d00231a3 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-68155

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III. Intelligence Information for CVE-2026-68155

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Patches & Fixes for CVE-2026-68155 (7)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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