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CVE-2026-52957— libceph: Fix potential null-ptr-deref in decode_choose_args()

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中decode_choose_args()函数在对CRUSH地图中的bucket_index进行解码时缺少对空bucket的检查，可能因处理损坏消息导致空指针取消引用。

CVSS 7.5 · High EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< 301286c0ccd37d66b0e40786fd35a4f19cdbd88a affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< 7169f326a23d0f547fcd90e68b72fd387622e126 affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< d7a65a34d2453f8cd3e0cc0e1319740af7e24276 affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< 312ec973efac0efb9b9ed64214235910e9ecbaa8 affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< f2f95e6d4b97e70bb876139b0583fc8079983f85 affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c affected
c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5< 28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf affected
… +10 more rows
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I. Basic Information for CVE-2026-52957

Vulnerability Information
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Vulnerability Title
libceph: Fix potential null-ptr-deref in decode_choose_args()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential null-ptr-deref in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. When decoding this CRUSH map in crush_decode(), an array of max_buckets CRUSH buckets is decoded, where some indices may not refer to actual buckets and are therefore set to NULL. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). When decoding a crush_choose_arg_map, a series of choose_args for different buckets is decoded, with the bucket_index being read from the incoming message. It is only checked that the bucket index does not exceed max_buckets, but not that it doesn't point to an index with a NULL bucket. If a (potentially corrupted) message contains a crush_choose_arg_map including such a bucket_index, a null pointer dereference may occur in the subsequent processing when attempting to access the bucket with the given index. This patch fixes the issue by extending the affected check. Now, it is only attempted to access the bucket if it is not NULL.
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于libceph中decode_choose_args()函数在对CRUSH地图中的bucket_index进行解码时缺少对空bucket的检查，可能因处理损坏消息导致空指针取消引用。
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 c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 ~ d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f -
Linux Linux 4.13 -

II. Public POCs for CVE-2026-52957

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III. Intelligence Information for CVE-2026-52957

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Patches & Fixes for CVE-2026-52957 (8)

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

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
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-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
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-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52957

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