CVE-2024-56772

Kernel crash via stale KUnit log pointer

Published Jan 8, 2025 · Updated May 11, 2026

Use-after-free in KUnit string-stream setup in Linux 6.7 through 6.12.3 allows local users to crash the kernel during test-suite initialization. When alloc_string_stream() fails in kunit_debugfs_create_suite(), the error path frees suite->log without clearing it, and kunit_init_suite() later passes the dangling pointer to string_stream_clear(). Reachability requires local KUnit test-suite initialization and an allocation failure; the demonstrated result is an Oops followed by a fatal kernel panic.

CVSS severity7.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in KUnit string-stream setup in Linux 6.7 through 6.12.3 allows local users to crash the kernel during test-suite initialization. When alloc_string_stream() fails in kunit_debugfs_create_suite(), the error path frees suite->log without clearing it, and kunit_init_suite() later passes the dangling pointer to string_stream_clear(). Reachability requires local KUnit test-suite initialization and an allocation failure; the demonstrated result is an Oops followed by a fatal kernel panic.

The record

CVE
CVE-2024-56772
Published
Jan 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 8, 2025CVE 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=6.7
  2. Affected versionversion=a3fdf784780ccb0008d630e8722d1389c49c7499 <3213b92754b94dec6836e8b4d6ec7d224a805b61
  3. Affected versionversion=a3fdf784780ccb0008d630e8722d1389c49c7499 <39e21403c978862846fa68b7f6d06f9cca235194

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=a3fdf784780ccb0008d630e8722d1389c49c7499 <3213b92754b94dec6836e8b4d6ec7d224a805b61; version=a3fdf784780ccb0008d630e8722d1389c49c7499 <39e21403c978862846fa68b7f6d06f9cca235194

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS: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-416Use After Free
T1499.004Application or System Exploitation

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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