CVE-2026-52954Network attack vector

Remote kernel crash via duplicate CRUSH map index

Published Jun 24, 2026 · Updated Jun 24, 2026

Reachable assertion in Linux Kernel libceph allows remote attackers to crash the kernel by supplying a crafted Ceph OSD map. decode_choose_args() inserts attacker-controlled choose_args_index values into the CRUSH map rbtree, and a duplicate key reaches an assertion in insert_choose_arg_map(). The vulnerable host must process a CEPH_MSG_OSD_MAP containing a CRUSH map with duplicate choose_args indices; the bounded consequence is a kernel crash.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in Linux Kernel libceph allows remote attackers to crash the kernel by supplying a crafted Ceph OSD map. decode_choose_args() inserts attacker-controlled choose_args_index values into the CRUSH map rbtree, and a duplicate key reaches an assertion in insert_choose_arg_map(). The vulnerable host must process a CEPH_MSG_OSD_MAP containing a CRUSH map with duplicate choose_args indices; the bounded consequence is a kernel crash.

The record

CVE
CVE-2026-52954
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499
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=0 <5.10.258
  2. Affected versionversion=0 <5.15.209
  3. Affected versionversion=0 <6.1.175
  4. Affected versionversion=0 <6.12.91
  5. Affected versionversion=0 <6.18.33
  6. Affected versionversion=0 <6.6.141
  7. Affected versionversion=0 <7.0.10
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0a1265a9ab875f92b6a3ffb497404f46cf9d76a3
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d2b37abda9536808655830d683dc491d31741a8
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <534ebc08df97c47d4c7596f336fa31ecbf91519c
  12. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80c73bd1b2b04355d1d0c29be8ccbd25a380905d
  13. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7bf7864e2924fa5508ac270b0e9364bc13d5a6c
  14. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d289478cfc0bcf81c7914200d6abdcb78bd04ded
  15. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f47430fc1f815e87406e2d3b4e476eff1bc7fd9b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <5.10.258; version=0 <5.15.209; version=0 <6.1.175; version=0 <6.12.91; version=0 <6.18.33; version=0 <6.6.141; version=0 <7.0.10; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0a1265a9ab875f92b6a3ffb497404f46cf9d76a3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d2b37abda9536808655830d683dc491d31741a8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <534ebc08df97c47d4c7596f336fa31ecbf91519c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80c73bd1b2b04355d1d0c29be8ccbd25a380905d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7bf7864e2924fa5508ac270b0e9364bc13d5a6c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d289478cfc0bcf81c7914200d6abdcb78bd04ded; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f47430fc1f815e87406e2d3b4e476eff1bc7fd9b

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-617Reachable Assertion
T1499Endpoint Denial of Service

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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