VulnerabilityPublished 10 Aug 2026Updated 6 Nov 2026

CVE-2026-68422: Linux kernel · btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f89df93e8aefa4c1c813f835559f2ac727f79766 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in f89df93e8aefa4c1c813f835559f2ac727f79766, ce6050bafb4e33377dc17fcc357736bfc351180c, b3d39b03799600c76c33486e2d29b73a771023db +4

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700, < f89df93e8aefa4c1c813f835559f2ac727f79766	Fixed in f89df93e8aefa4c1c813f835559f2ac727f79766
LinuxLinux	Affected ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700, < ce6050bafb4e33377dc17fcc357736bfc351180c	Fixed in ce6050bafb4e33377dc17fcc357736bfc351180c
LinuxLinux	Affected ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700, < b3d39b03799600c76c33486e2d29b73a771023db	Fixed in b3d39b03799600c76c33486e2d29b73a771023db
LinuxLinux	Affected ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700, < 7591d1727067d6063247901ad25c4bdc4e5695c4	Fixed in 7591d1727067d6063247901ad25c4bdc4e5695c4
LinuxLinux	Affected ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700, < 72f673d1c1deb819554d3e7e154f6d84301eb735	Fixed in 72f673d1c1deb819554d3e7e154f6d84301eb735
LinuxLinux	Affected ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700, < 60a23d4ea169e27403f3bb023bb98036797c0206	Fixed in 60a23d4ea169e27403f3bb023bb98036797c0206

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots() If we have an unexpected reloc_root for our root, we jump to the out label but never drop the reference we obtained for root, resulting in a leak. Add a missing btrfs_put_root() call.

References

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