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NVD / CVE Program· CNA Linux

CVE-2026-68450: btrfs: free mapping node on duplicate reloc root insert

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: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 14a8be9428435ee17f17fae7991215c246b7fd43, 29d9746812d8b7c37d594f484e994fd552c3ec33, 6a8269b6459ed870a8156c106a0f597383907872; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.

Low priority for now. Upgrade to Linux Linux 14a8be9428435ee17f17fae7991215c246b7fd43, 29d9746812d8b7c37d594f484e994fd552c3ec33, 6a8269b6459ed870a8156c106a0f597383907872; 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: free mapping node on duplicate reloc root insert __add_reloc_root() allocates a mapping_node before inserting it into rc->reloc_root_tree. If rb_simple_insert() finds an existing entry, it returns the existing rb_node and leaves the newly allocated node unlinked. The error path then returns -EEXIST without freeing the new node. Since the node was never inserted into reloc_root_tree, the later cleanup in put_reloc_control() cannot find it either. Free the newly allocated node before returning -EEXIST. The callers currently assert that -EEXIST should not happen, so this is a defensive cleanup for an unexpected duplicate insert path. If the path is ever reached, the local allocation should still be released.

—No exploit Fix available
Published
Aug 12, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 5th 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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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 exploit code appears or is weaponized
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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
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before 29d9746812d8b7c37d594f484e994fd552c3ec33affected · git
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8affected · git
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before 92bedc0455552b42ada1a1f42b0e3a8593cdfcccaffected · git
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before 14a8be9428435ee17f17fae7991215c246b7fd43affected · git
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151affected · git
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before ae0629ff9ccb836416ada129f4edc7efea6eaaadaffected · git
    • 57a304cfd43b2b4a5b44b8f5dc026abb34183068 and later · before 6a8269b6459ed870a8156c106a0f597383907872affected · 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-2026-68448Aug 12, 2026 · ovl: check access to copy_file_range source with src mounter creds
    0Monitor
  • ← EarlierCVE-2026-68449Aug 12, 2026 · ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
    0Monitor
  • Later →CVE-2026-68451Aug 13, 2026 · s390/zcrypt: Validate length for CCA ECC private key requests
    31Monitor

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 Linux14a8be9428435ee17f17fae7991215c246b7fd43Vendor (CNA)
Linux Linux29d9746812d8b7c37d594f484e994fd552c3ec33Vendor (CNA)
Linux Linux6a8269b6459ed870a8156c106a0f597383907872Vendor (CNA)
Linux Linux797dc567146c7e3c4f8d9680e4fbc76e0a6d9151Vendor (CNA)
Linux Linux92bedc0455552b42ada1a1f42b0e3a8593cdfcccVendor (CNA)
Linux Linuxae0629ff9ccb836416ada129f4edc7efea6eaaadVendor (CNA)
Linux Linuxb7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8Vendor (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).

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. SSVC exploitation— → none
  2. 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