CVE-2024-42266

Kernel memory corruption via Btrfs folio double-unlock

Published Aug 17, 2024 · Updated Aug 5, 2026

Memory corruption in Linux kernel 6.10 allows local users to read page-cache data or interrupt the host via writes to mounted Btrfs. The cow_file_range_inline() error path ignores locked_page and unlocks a folio before __extent_writepage() calls btrfs_folio_end_all_writers(). Write access to any mounted Btrfs filesystem is sufficient; the broken lock can cause stale-page reads, memory corruption, a panic, or a persistent hang.

CVSS severity7.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in Linux kernel 6.10 allows local users to read page-cache data or interrupt the host via writes to mounted Btrfs. The cow_file_range_inline() error path ignores locked_page and unlocks a folio before __extent_writepage() calls btrfs_folio_end_all_writers(). Write access to any mounted Btrfs filesystem is sufficient; the broken lock can cause stale-page reads, memory corruption, a panic, or a persistent hang.

The record

CVE
CVE-2024-42266
Published
Aug 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0586d0a89e77d717da14df42648ace4a9fd67981 <061e41581606000a83ce0f0f01d6ad338f3704e9
  2. Affected versionversion=0586d0a89e77d717da14df42648ace4a9fd67981 <478574370bef7951fbd9ef5155537d6cbed49472
  3. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0586d0a89e77d717da14df42648ace4a9fd67981 <061e41581606000a83ce0f0f01d6ad338f3704e9; version=0586d0a89e77d717da14df42648ace4a9fd67981 <478574370bef7951fbd9ef5155537d6cbed49472; version=6.10

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo