CVE-2026-97610

Incorrect write result via uninitialized return value

Published Sep 25, 2026 · Updated Sep 25, 2026

Incorrect error propagation in Linux 7.0 allows local users to receive unrelated results from synchronous CIFS writes. In netfs_unbuffered_write(), preparation failure or an empty iterator exits the first subrequest loop before ret is initialized, so netfs_unbuffered_write_iter_locked() returns that stray value instead of wreq->error. The condition also affects Linux 6.18.17 through 6.18.52 and 6.19 releases from 6.19.7 before 6.20, and requires cifs_prepare_write() to fail while reopening the file or obtaining credits.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect error propagation in Linux 7.0 allows local users to receive unrelated results from synchronous CIFS writes. In netfs_unbuffered_write(), preparation failure or an empty iterator exits the first subrequest loop before ret is initialized, so netfs_unbuffered_write_iter_locked() returns that stray value instead of wreq->error. The condition also affects Linux 6.18.17 through 6.18.52 and 6.19 releases from 6.19.7 before 6.20, and requires cifs_prepare_write() to fail while reopening the file or obtaining credits.

The record

CVE
CVE-2026-97610
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0
  2. Affected versionversion=6.18.17 <6.18.53
  3. Affected versionversion=6.19.7 <6.20
  4. Affected versionversion=7.0
  5. Affected versionversion=72d08d2839649d1c5efbe375751f4473fa4486af <3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26
  6. Affected versionversion=a0b4c7a49137ed21279f354eb59f49ddae8dffc2 <2e38d500471d097cda87d7d374bbc1b13493075d
  7. Affected versionversion=a0b4c7a49137ed21279f354eb59f49ddae8dffc2 <f18e8774f4d3137fa0a5fb8ffa83d59a719666d8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0; version=6.18.17 <6.18.53; version=6.19.7 <6.20; version=7.0; version=72d08d2839649d1c5efbe375751f4473fa4486af <3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26; version=a0b4c7a49137ed21279f354eb59f49ddae8dffc2 <2e38d500471d097cda87d7d374bbc1b13493075d; version=a0b4c7a49137ed21279f354eb59f49ddae8dffc2 <f18e8774f4d3137fa0a5fb8ffa83d59a719666d8

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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