CVE-2026-43408

Kernel crash via uninitialized Ceph path metadata

Published May 8, 2026 · Updated May 8, 2026

Memory corruption in the Linux Kernel CephFS client allows local users to crash the kernel during affected file operations. Several CephFS callers pass an uninitialized ceph_path_info to ceph_mdsc_build_path; after that call fails, ceph_mdsc_free_path_info frees garbage pointers. Reachability requires local access to an affected kernel with CephFS in use; the published record demonstrates a kernel crash, while privilege escalation remains speculative.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux Kernel CephFS client allows local users to crash the kernel during affected file operations. Several CephFS callers pass an uninitialized ceph_path_info to ceph_mdsc_build_path; after that call fails, ceph_mdsc_free_path_info frees garbage pointers. Reachability requires local access to an affected kernel with CephFS in use; the published record demonstrates a kernel crash, while privilege escalation remains speculative.

The record

CVE
CVE-2026-43408
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=15f519e9f883b316d86e2bb6b767a023aafd9d83 <43323a5934b660afae687e8e4e95ac328615a5c4
  2. Affected versionversion=15f519e9f883b316d86e2bb6b767a023aafd9d83 <453df1f4535842bf17ff1885a225e153d7ee3374
  3. Affected versionversion=15f519e9f883b316d86e2bb6b767a023aafd9d83 <8be8911f590813e6f90bc6407ced1b23e50bc5da
  4. Affected versionversion=2bfe45987eb346e299d9f763f9cd05f77011519f
  5. Affected versionversion=6.17
  6. Affected versionversion=db378e6f83ec705c6091c65d482d555edc2b0a72 <644b47f0574fd82aeb9d00317eca8d1f2a525c8c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15f519e9f883b316d86e2bb6b767a023aafd9d83 <43323a5934b660afae687e8e4e95ac328615a5c4; version=15f519e9f883b316d86e2bb6b767a023aafd9d83 <453df1f4535842bf17ff1885a225e153d7ee3374; version=15f519e9f883b316d86e2bb6b767a023aafd9d83 <8be8911f590813e6f90bc6407ced1b23e50bc5da; version=2bfe45987eb346e299d9f763f9cd05f77011519f; version=6.17; version=db378e6f83ec705c6091c65d482d555edc2b0a72 <644b47f0574fd82aeb9d00317eca8d1f2a525c8c

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
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.

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Technologies

Your stack

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Your stack

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