CVE-2026-68422

Service interruption via unreleased btrfs root reference

Published Aug 10, 2026 · Updated Aug 10, 2026

Resource leakage in the Linux kernel btrfs filesystem allows local users to interrupt service during balance or relocation operations. In fs/btrfs/relocation.c, merge_reloc_roots() obtains a root reference but takes its exit path for an unexpected reloc_root without calling btrfs_put_root(). Local access is required, and repeated encounters can exhaust resources and destabilize the system.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leakage in the Linux kernel btrfs filesystem allows local users to interrupt service during balance or relocation operations. In fs/btrfs/relocation.c, merge_reloc_roots() obtains a root reference but takes its exit path for an unexpected reloc_root without calling btrfs_put_root(). Local access is required, and repeated encounters can exhaust resources and destabilize the system.

The record

CVE
CVE-2026-68422
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <60a23d4ea169e27403f3bb023bb98036797c0206
  2. Affected versionversion=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <72f673d1c1deb819554d3e7e154f6d84301eb735
  3. Affected versionversion=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <7591d1727067d6063247901ad25c4bdc4e5695c4
  4. Affected versionversion=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <b3d39b03799600c76c33486e2d29b73a771023db
  5. Affected versionversion=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <ce6050bafb4e33377dc17fcc357736bfc351180c
  6. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <60a23d4ea169e27403f3bb023bb98036797c0206; version=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <72f673d1c1deb819554d3e7e154f6d84301eb735; version=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <7591d1727067d6063247901ad25c4bdc4e5695c4; version=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <b3d39b03799600c76c33486e2d29b73a771023db; version=24213fa46c7080c31d79aa2e3e2f0d9480cab700 <ce6050bafb4e33377dc17fcc357736bfc351180c; version=5.13

Published CVSS scores

5.5Red HatCVSS: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-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial of Service

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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