CVE-2026-43273

Snapshot data corruption via missing OSD context

Published May 6, 2026 · Updated May 6, 2026

Snapshot integrity failure in affected Linux Kernel releases allows local users to corrupt CephFS snapshot data through hole punching. In fs/ceph/file.c, ceph_zero_partial_object() sends its zeroing OSD write without the inode snapshot context, so a live-file operation also changes data preserved by an existing snapshot. Reachability requires a mounted CephFS client with write and snapshot permissions; the demonstrated consequence is silent snapshot-content modification rather than code execution or a service crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Snapshot integrity failure in affected Linux Kernel releases allows local users to corrupt CephFS snapshot data through hole punching. In fs/ceph/file.c, ceph_zero_partial_object() sends its zeroing OSD write without the inode snapshot context, so a live-file operation also changes data preserved by an existing snapshot. Reachability requires a mounted CephFS client with write and snapshot permissions; the demonstrated consequence is silent snapshot-content modification rather than code execution or a service crash.

The record

CVE
CVE-2026-43273
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=3.12
  2. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <36673344b41c31fb502dd0d0113cec1aa96f581e
  3. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <4097e70fc543cca72982854108a32f6ae924e727
  4. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <531a76c5a2e44264cee8a70121e63eb28c1ba728
  5. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <5788b742007f53406049bef917833a71ddd43f60
  6. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <69e59a87bab0ea31ab2a584fc65e12dafacf8953
  7. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <757873abfc8ea38592582180aed0f57f0f0cb07a
  8. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <9efa154609cdb658f51c7d76b30a09f7e6485250
  9. Affected versionversion=ad7a60de882aca31afb58721db166f7e77afcd92 <f16bd3fa74a2084ee7e16a8a2be7e7399b970907

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.12; version=ad7a60de882aca31afb58721db166f7e77afcd92 <36673344b41c31fb502dd0d0113cec1aa96f581e; version=ad7a60de882aca31afb58721db166f7e77afcd92 <4097e70fc543cca72982854108a32f6ae924e727; version=ad7a60de882aca31afb58721db166f7e77afcd92 <531a76c5a2e44264cee8a70121e63eb28c1ba728; version=ad7a60de882aca31afb58721db166f7e77afcd92 <5788b742007f53406049bef917833a71ddd43f60; version=ad7a60de882aca31afb58721db166f7e77afcd92 <69e59a87bab0ea31ab2a584fc65e12dafacf8953; version=ad7a60de882aca31afb58721db166f7e77afcd92 <757873abfc8ea38592582180aed0f57f0f0cb07a; version=ad7a60de882aca31afb58721db166f7e77afcd92 <9efa154609cdb658f51c7d76b30a09f7e6485250; version=ad7a60de882aca31afb58721db166f7e77afcd92 <f16bd3fa74a2084ee7e16a8a2be7e7399b970907

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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

T1565.001Stored Data Manipulation

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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