CVE-2024-35949

Kernel crash via unchecked malformed filesystem metadata

Published May 20, 2024 · Updated Aug 5, 2026

Out-of-bounds access in the Btrfs tree checker in Linux 6.5 allows local users to crash the kernel with a crafted filesystem image. __btrfs_check_leaf() skipped item-pointer validation when a metadata leaf lacked the WRITTEN flag, so accessors reached beyond the extent buffer. Triggering requires local access and the ability to make the affected kernel mount attacker-controlled Btrfs media.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Btrfs tree checker in Linux 6.5 allows local users to crash the kernel with a crafted filesystem image. __btrfs_check_leaf() skipped item-pointer validation when a metadata leaf lacked the WRITTEN flag, so accessors reached beyond the extent buffer. Triggering requires local access and the ability to make the affected kernel mount attacker-controlled Btrfs media.

The record

CVE
CVE-2024-35949
Published
May 20, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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=6.5
  2. Affected versionversion=85d8a826c7cde17f9cca9c4debecb4538bdb6573 <9dff3e36ea89e8003516841c27c45af562b6ef44
  3. Affected versionversion=85d8a826c7cde17f9cca9c4debecb4538bdb6573 <e03418abde871314e1a3a550f4c8afb7b89cb273
  4. Affected versionversion=85d8a826c7cde17f9cca9c4debecb4538bdb6573 <ef3ba8ce8cf7075b716aa4afcefc3034215878ee

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=85d8a826c7cde17f9cca9c4debecb4538bdb6573 <9dff3e36ea89e8003516841c27c45af562b6ef44; version=85d8a826c7cde17f9cca9c4debecb4538bdb6573 <e03418abde871314e1a3a550f4c8afb7b89cb273; version=85d8a826c7cde17f9cca9c4debecb4538bdb6573 <ef3ba8ce8cf7075b716aa4afcefc3034215878ee

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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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-787Out-of-bounds Write

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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