CVE-2026-98124Public exploit

Stale data exposure via valid FS-Cache cookie

Published Sep 25, 2026 · Updated Sep 25, 2026

Stale-data exposure in the Linux SMB client allows local users to read pre-operation file contents from FS-Cache after a range change. The smb3_zero_range(), smb3_punch_hole(), smb3_insert_range(), and smb3_collapse_range() paths discard affected page-cache pages but leave the FS-Cache cookie valid, so a later read returns data cached before the server-side change. Reproduction requires a CIFS mount with fsc enabled, an active CacheFiles backend, and root access to drop caches; the demonstrated consequence is stale file-content disclosure.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stale-data exposure in the Linux SMB client allows local users to read pre-operation file contents from FS-Cache after a range change. The smb3_zero_range(), smb3_punch_hole(), smb3_insert_range(), and smb3_collapse_range() paths discard affected page-cache pages but leave the FS-Cache cookie valid, so a later read returns data cached before the server-side change. Reproduction requires a CIFS mount with fsc enabled, an active CacheFiles backend, and root access to drop caches; the demonstrated consequence is stale file-content disclosure.

The record

CVE
CVE-2026-98124
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
admin

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=3.17
  2. Affected versionversion=31742c5a331766bc7df6b0d525df00c6cd20d5a6 <448ba0ae65ca61064183564d2983c9aa59bd6ba7
  3. Affected versionversion=31742c5a331766bc7df6b0d525df00c6cd20d5a6 <93c6e5a8d7c5071d586c1411596d5db5faad22b2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=31742c5a331766bc7df6b0d525df00c6cd20d5a6 <448ba0ae65ca61064183564d2983c9aa59bd6ba7; version=31742c5a331766bc7df6b0d525df00c6cd20d5a6 <93c6e5a8d7c5071d586c1411596d5db5faad22b2

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1005Data from Local System

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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