CVE-2024-46753

Local crash via unchecked btrfs_dec_ref error

Published Sep 18, 2024 · Updated May 11, 2026

Reachable assertion in the btrfs extent-tree code in Linux 2.6.31 and later allows local users to crash the kernel during snapshot deletion. In walk_up_proc(), an error returned by btrfs_dec_ref() is passed to BUG_ON(ret) instead of the function's existing error-return path, forcing a kernel BUG when the reference update fails. Exploitation requires local low-privileged access and a mounted btrfs filesystem, and the reported consequence is a system crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the btrfs extent-tree code in Linux 2.6.31 and later allows local users to crash the kernel during snapshot deletion. In walk_up_proc(), an error returned by btrfs_dec_ref() is passed to BUG_ON(ret) instead of the function's existing error-return path, forcing a kernel BUG when the reference update fails. Exploitation requires local low-privileged access and a mounted btrfs filesystem, and the reported consequence is a system crash without data disclosure or modification.

The record

CVE
CVE-2024-46753
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.31
  2. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <0e4840ae09f375381167000ce47424818fcbcc7c
  3. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <2c4fe45351e544da4b8f10c74b277117a4fa7869
  4. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <5eb178f373b4f16f3b42d55ff88fc94dd95b93b1
  5. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <67e4ca7ddc67ef949326b4dc404a9678bbe67d72
  6. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <9c8237021b53d52357c0de07a768582fafb2791d
  7. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <a7f16a7a709845855cb5a0e080a52bda5873f9de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=2c47e605a91dde6b0514f689645e7ab336c8592a <0e4840ae09f375381167000ce47424818fcbcc7c; version=2c47e605a91dde6b0514f689645e7ab336c8592a <2c4fe45351e544da4b8f10c74b277117a4fa7869; version=2c47e605a91dde6b0514f689645e7ab336c8592a <5eb178f373b4f16f3b42d55ff88fc94dd95b93b1; version=2c47e605a91dde6b0514f689645e7ab336c8592a <67e4ca7ddc67ef949326b4dc404a9678bbe67d72; version=2c47e605a91dde6b0514f689645e7ab336c8592a <9c8237021b53d52357c0de07a768582fafb2791d; version=2c47e605a91dde6b0514f689645e7ab336c8592a <a7f16a7a709845855cb5a0e080a52bda5873f9de

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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