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CVE-2026-52955— libceph: Fix potential out-of-bounds access 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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于libceph组件的crush_decode()函数在处理CEPH_MSG_OSD_MAP消息时，若crush map中至少包含一个bucket且两个算法字段值不一致，可能导致越界访问。

CVSS 9.8 · Critical EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f24e9980eb860d8600cbe5ef3d2fd9295320d229< 6e70ef53e818c53eab28d7b0026b7fd03dddaba5 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< ebe76d58a48a48031b98543d86c4cd30a825b622 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 3f42508191e129ee6b5ea96578d5cab14f2a013a affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< ea0d42137f0c06da71e37ffc647aab4c5309599a affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5 affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 0f3604cbe4df14c5e58288ac9f57511e726a222d affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< fb176a99e4c1a5a8448a83d83d3606203ba81faa affected
f24e9980eb860d8600cbe5ef3d2fd9295320d229< 4c79fc2d598694bda845b46229c9d48b65042970 affected
… +10 more rows
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I. Basic Information for CVE-2026-52955

Vulnerability Information
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Vulnerability Title
libceph: Fix potential out-of-bounds access in crush_decode()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in crush_decode() A message of type CEPH_MSG_OSD_MAP containing a crush map with at least one bucket has two fields holding the bucket algorithm. If the values in these two fields differ, an out-of-bounds access can occur. This is the case because the first algorithm field (alg) is used to allocate the correct amount of memory for a bucket of this type, while the second algorithm field inside the bucket (b->alg) is used in the subsequent processing. This patch fixes the issue by adding a check that compares alg and b->alg and aborts the processing in case they differ. Furthermore, b->alg is set to 0 in this case, because the destruction of the crush map also uses this field to determine the bucket type, which can again result in an out-of-bounds access when trying to free the memory pointed to by the fields of the bucket. To correctly free the memory allocated for the bucket in such a case, the corresponding call to kfree is moved from the algorithm-specific crush_destroy_bucket functions to the generic crush_destroy_bucket().
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于libceph组件的crush_decode()函数在处理CEPH_MSG_OSD_MAP消息时，若crush map中至少包含一个bucket且两个算法字段值不一致，可能导致越界访问。
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 ~ 6e70ef53e818c53eab28d7b0026b7fd03dddaba5 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-52955

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III. Intelligence Information for CVE-2026-52955

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Patches & Fixes for CVE-2026-52955 (6)

Other References for CVE-2026-52955 (1)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-52968 8.8 HIGH KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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