CVE-2024-46840

Local system crash via btrfs zero-reference assertions

Published Sep 27, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel btrfs subsystem allows local users to crash the system during snapshot deletion. The reada path calls BUG_ON when an unlocked extent-leaf lookup transiently reports zero references; walk_down_proc and walk_up_proc also assert on zero references instead of returning an error. Reachability requires local low-privileged access and the ability to delete a btrfs snapshot; a triggered assertion terminates the kernel without reported 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

Denial of service in the Linux kernel btrfs subsystem allows local users to crash the system during snapshot deletion. The reada path calls BUG_ON when an unlocked extent-leaf lookup transiently reports zero references; walk_down_proc and walk_up_proc also assert on zero references instead of returning an error. Reachability requires local low-privileged access and the ability to delete a btrfs snapshot; a triggered assertion terminates the kernel without reported data disclosure or modification.

The record

CVE
CVE-2024-46840
Published
Sep 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 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 <03804641ec2d0da4fa088ad21c88e703d151ce16
  3. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <71291aa7246645ef622621934d2067400380645e
  4. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <728d4d045b628e006b48a448f3326a7194c88d32
  5. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <7d1df13bf078ffebfedd361d714ff6cee1ff01b9
  6. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <9cc887ac24b7a0598f4042ae9af6b9a33072f75b
  7. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <b8ccef048354074a548f108e51d0557d6adfd3a3
  8. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <c60676b81fab456b672796830f6d8057058f029c
  9. Affected versionversion=2c47e605a91dde6b0514f689645e7ab336c8592a <c847b28a799733b04574060ab9d00f215970627d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=2c47e605a91dde6b0514f689645e7ab336c8592a <03804641ec2d0da4fa088ad21c88e703d151ce16; version=2c47e605a91dde6b0514f689645e7ab336c8592a <71291aa7246645ef622621934d2067400380645e; version=2c47e605a91dde6b0514f689645e7ab336c8592a <728d4d045b628e006b48a448f3326a7194c88d32; version=2c47e605a91dde6b0514f689645e7ab336c8592a <7d1df13bf078ffebfedd361d714ff6cee1ff01b9; version=2c47e605a91dde6b0514f689645e7ab336c8592a <9cc887ac24b7a0598f4042ae9af6b9a33072f75b; version=2c47e605a91dde6b0514f689645e7ab336c8592a <b8ccef048354074a548f108e51d0557d6adfd3a3; version=2c47e605a91dde6b0514f689645e7ab336c8592a <c60676b81fab456b672796830f6d8057058f029c; version=2c47e605a91dde6b0514f689645e7ab336c8592a <c847b28a799733b04574060ab9d00f215970627d

Published CVSS scores

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.

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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

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

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Your stack

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