CVE-2026-52957Network attack vector

Kernel crash via unchecked null CRUSH bucket

Published Jun 24, 2026 · Updated Jun 24, 2026

Null pointer dereference in Linux Kernel 4.13 and later affected branches allows remote attackers to crash systems via a crafted Ceph OSD map. decode_choose_args() checks that an incoming bucket_index is below max_buckets but does not verify that the indexed CRUSH bucket is non-NULL before dereferencing it. Exploitation requires a system using libceph to decode an attacker-controlled or corrupted CEPH_MSG_OSD_MAP; the resulting null dereference crashes the kernel and interrupts system availability.

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

Null pointer dereference in Linux Kernel 4.13 and later affected branches allows remote attackers to crash systems via a crafted Ceph OSD map. decode_choose_args() checks that an incoming bucket_index is below max_buckets but does not verify that the indexed CRUSH bucket is non-NULL before dereferencing it. Exploitation requires a system using libceph to decode an attacker-controlled or corrupted CEPH_MSG_OSD_MAP; the resulting null dereference crashes the kernel and interrupts system availability.

The record

CVE
CVE-2026-52957
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, 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=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 <28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <301286c0ccd37d66b0e40786fd35a4f19cdbd88a
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <312ec973efac0efb9b9ed64214235910e9ecbaa8
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7169f326a23d0f547fcd90e68b72fd387622e126
  12. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c
  13. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f
  14. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7a65a34d2453f8cd3e0cc0e1319740af7e24276
  15. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f2f95e6d4b97e70bb876139b0583fc8079983f85

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 <28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <301286c0ccd37d66b0e40786fd35a4f19cdbd88a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <312ec973efac0efb9b9ed64214235910e9ecbaa8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7169f326a23d0f547fcd90e68b72fd387622e126; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7a65a34d2453f8cd3e0cc0e1319740af7e24276; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f2f95e6d4b97e70bb876139b0583fc8079983f85

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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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