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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98245: btrfs: take commit root semaphore when iterating in mark_block_group_to_copy()

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0594e3423f4ba3137c734371169491f9a98e9af4, 709f6a5e986535005110c6c69b322f63631cb200, 8e2007b263ea250251ec3021a0a197da990ee1a8; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 0594e3423f4ba3137c734371169491f9a98e9af4, 709f6a5e986535005110c6c69b322f63631cb200, 8e2007b263ea250251ec3021a0a197da990ee1a8; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes 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: take commit root semaphore when iterating in mark_block_group_to_copy() mark_block_group_to_copy() iterates over the commit root with skip_locking=true. A concurrent transaction commit can swap and free the commit root during iteration, causing use-after-free when accessing extent buffers. Fix it by using path->need_commit_sem to protect the commit root search.

—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 6th 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%

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

    • 5.12affected
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before 90242b776df83f8b1ea901f80b568b4fc2318c61affected · git
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before bffe773f92885603db14047bba0f12089105929eaffected · git
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before 93a025166495c63ba5b8ac721c7040d5312e8335affected · git
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before 8e2007b263ea250251ec3021a0a197da990ee1a8affected · git
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before 709f6a5e986535005110c6c69b322f63631cb200affected · git
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before c32490c6d3f3a9f2d177d57c7eb8bbc347561d08affected · git
    • 78ce9fc269af6e69c1399ab910ba6bc81c934f67 and later · before 0594e3423f4ba3137c734371169491f9a98e9af4affected · git
    • before 5.12not affected · semver
    • 5.15.224 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:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

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-2026-98243Oct 6, 2026 · dma-buf/dma-fence: fix checking signaling bit for timeline and driver name v3
    28Monitor
  • ← EarlierCVE-2026-98244Oct 6, 2026 · btrfs: clear free space tree creation state on rebuild failure
    0Monitor
  • Later →CVE-2026-98246Oct 6, 2026 · Bluetooth: hci_sync: Serialize local codec list cleanup
    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 Linux0594e3423f4ba3137c734371169491f9a98e9af4Vendor (CNA)
Linux Linux709f6a5e986535005110c6c69b322f63631cb200Vendor (CNA)
Linux Linux8e2007b263ea250251ec3021a0a197da990ee1a8Vendor (CNA)
Linux Linux90242b776df83f8b1ea901f80b568b4fc2318c61Vendor (CNA)
Linux Linux93a025166495c63ba5b8ac721c7040d5312e8335Vendor (CNA)
Linux Linuxbffe773f92885603db14047bba0f12089105929eVendor (CNA)
Linux Linuxc32490c6d3f3a9f2d177d57c7eb8bbc347561d08Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 4, 2026+29 d
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. Exploit maturity— → 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