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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 3f586b4c92e4272fcd01bf0db0590b63acf3e85b, 60a23d4ea169e27403f3bb023bb98036797c0206, 72f673d1c1deb819554d3e7e154f6d84301eb735; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3f586b4c92e4272fcd01bf0db0590b63acf3e85b, 60a23d4ea169e27403f3bb023bb98036797c0206, 72f673d1c1deb819554d3e7e154f6d84301eb735; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Aug 10, 2026
Updated
Aug 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.13affected
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before f89df93e8aefa4c1c813f835559f2ac727f79766affected · git
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before 3f586b4c92e4272fcd01bf0db0590b63acf3e85baffected · git
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before b3d39b03799600c76c33486e2d29b73a771023dbaffected · git
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before 72f673d1c1deb819554d3e7e154f6d84301eb735affected · git
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before 60a23d4ea169e27403f3bb023bb98036797c0206affected · git
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before 7591d1727067d6063247901ad25c4bdc4e5695c4affected · git
    • 24213fa46c7080c31d79aa2e3e2f0d9480cab700 and later · before ce6050bafb4e33377dc17fcc357736bfc351180caffected · git
    • before 5.13not affected · semver
    • 5.15.216 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68416Aug 10, 2026 · mtd: fix double free and WARN_ON in add_mtd_device() error paths
    0Monitor
  • ← EarlierCVE-2026-68420Aug 10, 2026 · xfrm: reject optional IPTFS templates in outbound policies
    28Monitor
  • Later →CVE-2026-68423Aug 10, 2026 · mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3f586b4c92e4272fcd01bf0db0590b63acf3e85bVendor (CNA)
Linux Linux60a23d4ea169e27403f3bb023bb98036797c0206Vendor (CNA)
Linux Linux72f673d1c1deb819554d3e7e154f6d84301eb735Vendor (CNA)
Linux Linux7591d1727067d6063247901ad25c4bdc4e5695c4Vendor (CNA)
Linux Linuxb3d39b03799600c76c33486e2d29b73a771023dbVendor (CNA)
Linux Linuxce6050bafb4e33377dc17fcc357736bfc351180cVendor (CNA)
Linux Linuxf89df93e8aefa4c1c813f835559f2ac727f79766Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records