CVE-2026-98267Public exploitHinoki check available

Silent file corruption via stale 9p size metadata

Published Oct 6, 2026 · Updated Oct 6, 2026

File corruption in the Linux 9p client allows local users to replace server data with NULs through writes to a cached 9p mount. After p9_client_write extends a server file, v9fs_issue_write() fails to advance i_size and remote_i_size, leaving netfs to zero-fill ranges that contain valid data. Exposure requires a writable 9p mount using mmap, loose, or fscache writeback caching; reads can return silent NULs, and partial writes can overwrite the server copy.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

File corruption in the Linux 9p client allows local users to replace server data with NULs through writes to a cached 9p mount. After p9_client_write extends a server file, v9fs_issue_write() fails to advance i_size and remote_i_size, leaving netfs to zero-fill ranges that contain valid data. Exposure requires a writable 9p mount using mmap, loose, or fscache writeback caching; reads can return silent NULs, and partial writes can overwrite the server copy.

The record

CVE
CVE-2026-98267
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1565.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 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=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <88871ab548c1d7b11cde9b04063f3c1c6fbd7039
  2. Affected versionversion=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <9cd92e3392bdd14568e9e44aec1ac05e1fcd62e5
  3. Affected versionversion=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <aeb1fe55583836744aef11fbfa2a09122aa9816c
  4. Affected versionversion=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <c60ae98c5aa64021751b38ab1313b19d620bf640
  5. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <88871ab548c1d7b11cde9b04063f3c1c6fbd7039; version=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <9cd92e3392bdd14568e9e44aec1ac05e1fcd62e5; version=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <aeb1fe55583836744aef11fbfa2a09122aa9816c; version=5fb70e7275a61dd404f684370e1add7fe0ebe9c5 <c60ae98c5aa64021751b38ab1313b19d620bf640; version=6.10

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1565.001Stored Data Manipulation

Public exploit references

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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