CVE-2026-98245

Kernel memory corruption via unprotected commit-root traversal

Published Oct 6, 2026 · Updated Oct 6, 2026

Use-after-free in Linux btrfs allows attackers to trigger kernel memory corruption during concurrent zoned device replacement. The mark_block_group_to_copy() path searches the commit root with locking skipped, so a concurrent transaction commit can free an extent buffer before it is accessed. The race requires zoned btrfs device replacement and a concurrent commit; the public patch does not establish a reliable crash or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux btrfs allows attackers to trigger kernel memory corruption during concurrent zoned device replacement. The mark_block_group_to_copy() path searches the commit root with locking skipped, so a concurrent transaction commit can free an extent buffer before it is accessed. The race requires zoned btrfs device replacement and a concurrent commit; the public patch does not establish a reliable crash or code execution.

The record

CVE
CVE-2026-98245
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=5.12
  2. Affected versionversion=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <0594e3423f4ba3137c734371169491f9a98e9af4
  3. Affected versionversion=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <709f6a5e986535005110c6c69b322f63631cb200
  4. Affected versionversion=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <8e2007b263ea250251ec3021a0a197da990ee1a8
  5. Affected versionversion=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <c32490c6d3f3a9f2d177d57c7eb8bbc347561d08

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <0594e3423f4ba3137c734371169491f9a98e9af4; version=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <709f6a5e986535005110c6c69b322f63631cb200; version=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <8e2007b263ea250251ec3021a0a197da990ee1a8; version=78ce9fc269af6e69c1399ab910ba6bc81c934f67 <c32490c6d3f3a9f2d177d57c7eb8bbc347561d08

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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