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CVE-2026-68154— libceph: reject zero bucket types in crush_decode

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 2.6.34版本存在安全漏洞，该漏洞源于crush_decode函数未拒绝零bucket类型，可能允许恶意CRUSH映射将负bucket ID当作设备，并以负值索引OSD权重数组。

CVSS 9.8 · Critical EPSS 0.71% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f24e9980eb860d8600cbe5ef3d2fd9295320d229< 952ca5dc99913d169263f59fd689f586729a13c1 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 146461f09565afe3665e65b0423d3d6b0fe806c5 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 80fc40e11cda1b5d990a3f69c6efa344fb5cd987 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< b8a9fb6bf806f9c4891e71ae1beab0c07c23a877 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 826cd1de5802fd392922785f9b64d76e65d2a100 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 70998f91030ee083ecb336a1dff0701c20a38081 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 05f90284223381005d6bcddab3fda4a97f9c3401 affected
… +10 more rows
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I. Basic Information for CVE-2026-68154

Vulnerability Information
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Vulnerability Title
libceph: reject zero bucket types in crush_decode
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: reject zero bucket types in crush_decode CRUSH bucket type 0 is reserved for devices. The mapper relies on that invariant and uses type 0 to identify leaf devices. If crush_decode() accepts a bucket with type 0, a malformed CRUSH map can make the mapper treat a negative bucket ID as a device and pass it to is_out(), which then indexes the OSD weight array with a negative value. Reject zero bucket types while decoding the CRUSH map so the invalid state never reaches the mapper.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 2.6.34版本存在安全漏洞，该漏洞源于crush_decode函数未拒绝零bucket类型，可能允许恶意CRUSH映射将负bucket ID当作设备，并以负值索引OSD权重数组。
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 f24e9980eb860d8600cbe5ef3d2fd9295320d229 ~ 952ca5dc99913d169263f59fd689f586729a13c1 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-68154

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III. Intelligence Information for CVE-2026-68154

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Patches & Fixes for CVE-2026-68154 (7)

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

CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow
CVE-2026-68083 9.1 CRITICAL ksmbd: fix path resolution in ksmbd_vfs_kern_path_create

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68154

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