CVE-2026-52958Network attack vector

Memory disclosure and service interruption via osdmap decoding

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds access in libceph in affected Linux Kernel releases allows remote attackers to expose memory or interrupt service. The osdmap_decode() bounds check reserves space for one osd_weight element but decodes osd_state and osd_weight map->max_osd times. Reachability requires a Linux Ceph client to accept a corrupted OSD map from a malicious or compromised Ceph cluster.

CVSS severity9.1
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in libceph in affected Linux Kernel releases allows remote attackers to expose memory or interrupt service. The osdmap_decode() bounds check reserves space for one osd_weight element but decodes osd_state and osd_weight map->max_osd times. Reachability requires a Linux Ceph client to accept a corrupted OSD map from a malicious or compromised Ceph cluster.

The record

CVE
CVE-2026-52958
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.3
  2. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <0d2dd7e6bb74fd7712aa73457a4a821906c6863a
  3. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <35d0ed82d03e5ee77ea4f31f20e29562a7721649
  4. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <36a79759a288961b1ff28a68ec2d1f56f6848098
  5. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <3f2575bb7f955d42569d96c3e04fa958a0dcf4b4
  6. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <48df98d12b15360cd56af5c1f460307b340c1197
  7. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <8713bbc4b2b9ad78f803978e54b7e49dd21bd9be
  8. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <e7187f33c02488697ec0d01d82bf7a3f8deaba8f
  9. Affected versionversion=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <ee933694645dac062d65fc2743f92bc06fa0db6b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.3; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <0d2dd7e6bb74fd7712aa73457a4a821906c6863a; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <35d0ed82d03e5ee77ea4f31f20e29562a7721649; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <36a79759a288961b1ff28a68ec2d1f56f6848098; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <3f2575bb7f955d42569d96c3e04fa958a0dcf4b4; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <48df98d12b15360cd56af5c1f460307b340c1197; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <8713bbc4b2b9ad78f803978e54b7e49dd21bd9be; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <e7187f33c02488697ec0d01d82bf7a3f8deaba8f; version=dcbc919a5dc8c2629684a113a90c0b6fe10c3462 <ee933694645dac062d65fc2743f92bc06fa0db6b

Published CVSS scores

9.1kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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