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CVE-2026-52958— libceph: Fix potential out-of-bounds access in osdmap_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基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于libceph在osdmap_decode()中ceph_decode_need()检查不足，可能导致越界内存访问。

CVSS 9.1 · Critical EPSS 0.73% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux dcbc919a5dc8c2629684a113a90c0b6fe10c3462< 36a79759a288961b1ff28a68ec2d1f56f6848098 affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< 3f2575bb7f955d42569d96c3e04fa958a0dcf4b4 affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< 8713bbc4b2b9ad78f803978e54b7e49dd21bd9be affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< 0d2dd7e6bb74fd7712aa73457a4a821906c6863a affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< e7187f33c02488697ec0d01d82bf7a3f8deaba8f affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< 48df98d12b15360cd56af5c1f460307b340c1197 affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< ee933694645dac062d65fc2743f92bc06fa0db6b affected
dcbc919a5dc8c2629684a113a90c0b6fe10c3462< 35d0ed82d03e5ee77ea4f31f20e29562a7721649 affected
… +10 more rows
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I. Basic Information for CVE-2026-52958

Vulnerability Information
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Vulnerability Title
libceph: Fix potential out-of-bounds access in osdmap_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 osdmap_decode() When decoding osd_state and osd_weight from an incoming osdmap in osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This can potentially result in an out-of-bounds memory access if the incoming message is corrupted such that the max_osd value exceeds the actual content of the osdmap message. This patch fixes the issue by changing the corresponding part in the ceph_decode_need() check to account for map->max_osd*sizeof(*map->osd_weight).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.3版本存在安全漏洞，该漏洞源于libceph在osdmap_decode()中ceph_decode_need()检查不足，可能导致越界内存访问。
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 dcbc919a5dc8c2629684a113a90c0b6fe10c3462 ~ 36a79759a288961b1ff28a68ec2d1f56f6848098 -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-52958

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III. Intelligence Information for CVE-2026-52958

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Patches & Fixes for CVE-2026-52958 (8)

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-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
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-2026-52999 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-2026-52968 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

V. Comments for CVE-2026-52958

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