CVE-2026-23147

Local service interruption via unreleased compression folios

Published Feb 14, 2026 · Updated Feb 14, 2026

Memory leak in Linux Kernel 6.15 through 6.18.8 allows local users to interrupt service through S390-accelerated Btrfs zlib compression. The S390 hardware-acceleration path in copy_data_into_buffer() obtains page-cache folios through btrfs_compress_filemap_get_folio() but omits the corresponding folio_put(), retaining a reference after each handled folio. Reachability requires an S390 system using Btrfs zlib hardware acceleration and local activity that invokes compression; repeated leaks consume memory and interrupt availability.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in Linux Kernel 6.15 through 6.18.8 allows local users to interrupt service through S390-accelerated Btrfs zlib compression. The S390 hardware-acceleration path in copy_data_into_buffer() obtains page-cache folios through btrfs_compress_filemap_get_folio() but omits the corresponding folio_put(), retaining a reference after each handled folio. Reachability requires an S390 system using Btrfs zlib hardware acceleration and local activity that invokes compression; repeated leaks consume memory and interrupt availability.

The record

CVE
CVE-2026-23147
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=6.15
  2. Affected versionversion=aa60fe12b4f49f49fc73e5023f8675e2df1f7805 <0d0f1314e8f86f5205f71f9e31e272a1d008e40b
  3. Affected versionversion=aa60fe12b4f49f49fc73e5023f8675e2df1f7805 <e80617a5e1c246da2f112a1a072cdd535046adfe

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.15; version=aa60fe12b4f49f49fc73e5023f8675e2df1f7805 <0d0f1314e8f86f5205f71f9e31e272a1d008e40b; version=aa60fe12b4f49f49fc73e5023f8675e2df1f7805 <e80617a5e1c246da2f112a1a072cdd535046adfe

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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