CVE-2024-42252

Kernel panic via reachable closure assertion

Published Aug 8, 2024 · Updated May 11, 2026

Reachable assertion in the Linux kernel from 3.10 through 6.10-rc4 allows local users to trigger a kernel panic through closure handling. In closure_put at lib/closure.c:21, a BUG_ON evaluates closure guard flags during bcachefs deadlock handling and turns the observed state into a fatal kernel exception rather than a warning. Low-privileged local access is required; the demonstrated bcachefs btree-update path terminates the host, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.21%
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 Linux kernel from 3.10 through 6.10-rc4 allows local users to trigger a kernel panic through closure handling. In closure_put at lib/closure.c:21, a BUG_ON evaluates closure guard flags during bcachefs deadlock handling and turns the observed state into a fatal kernel exception rather than a warning. Low-privileged local access is required; the demonstrated bcachefs btree-update path terminates the host, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2024-42252
Published
Aug 8, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 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=3.10
  2. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <339b84ab6b1d66900c27bd999271cb2ae40ce812
  3. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <5d85f2ab79d5918a66539ebf046c099f7448db8d
  4. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <c894a74756478bb7aec894bcc513add3d554c0cf
  5. Affected versionversion=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <ecb4aaa658da760fb83afd79cc5fd4360aa60635

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.10; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <339b84ab6b1d66900c27bd999271cb2ae40ce812; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <5d85f2ab79d5918a66539ebf046c099f7448db8d; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <c894a74756478bb7aec894bcc513add3d554c0cf; version=cafe563591446cf80bfbc2fe3bc72a2e36cf1060 <ecb4aaa658da760fb83afd79cc5fd4360aa60635

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

CWE-617Reachable Assertion
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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