CVE-2024-44963

Local kernel crash via unchecked btrfs error

Published Sep 4, 2024 · Updated May 11, 2026

Improper error handling in affected Linux kernel releases starting with 4.11 allows local users to crash the kernel through btrfs. btrfs_free_tree_block() invokes BUG_ON() rather than returning a delayed-reference error propagated from btrfs_qgroup_trace_extent_post(). Reachability requires btrfs qgroups and an error during delayed-reference creation, such as allocation failure; the assertion stops the running kernel.

CVSS severity5.5
Medium
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

Improper error handling in affected Linux kernel releases starting with 4.11 allows local users to crash the kernel through btrfs. btrfs_free_tree_block() invokes BUG_ON() rather than returning a delayed-reference error propagated from btrfs_qgroup_trace_extent_post(). Reachability requires btrfs qgroups and an error during delayed-reference creation, such as allocation failure; the assertion stops the running kernel.

The record

CVE
CVE-2024-44963
Published
Sep 4, 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 4, 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=4.11
  2. Affected versionversion=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <22d907bcd283d69d5e60497fc0d51969545c583b
  3. Affected versionversion=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <98251cd60b4d702a8a81de442ab621e83a3fb24f
  4. Affected versionversion=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <bb3868033a4cccff7be57e9145f2117cbdc91c11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <22d907bcd283d69d5e60497fc0d51969545c583b; version=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <98251cd60b4d702a8a81de442ab621e83a3fb24f; version=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <bb3868033a4cccff7be57e9145f2117cbdc91c11

Published CVSS scores

5.5NISTCVSS: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 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

T1499Endpoint Denial of Service

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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