CVE-2024-36966

Kernel warning via unallocated anonymous-device identifier free

Published Jun 8, 2024 · Updated May 11, 2026

Access of uninitialized pointer in Linux EROFS allows local users to trigger a kernel warning during filesystem teardown. In block-device mode, erofs_kill_sb() mistakes an uninitialized s_bdev for fscache mode and passes an anonymous-device identifier that was never allocated to ida_free(). The path requires CONFIG_EROFS_FS_ONDEMAND and incomplete superblock initialization; the published trace demonstrates a warning rather than a confirmed crash or reboot.

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

Access of uninitialized pointer in Linux EROFS allows local users to trigger a kernel warning during filesystem teardown. In block-device mode, erofs_kill_sb() mistakes an uninitialized s_bdev for fscache mode and passes an anonymous-device identifier that was never allocated to ida_free(). The path requires CONFIG_EROFS_FS_ONDEMAND and incomplete superblock initialization; the published trace demonstrates a warning rather than a confirmed crash or reboot.

The record

CVE
CVE-2024-36966
Published
Jun 8, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-824, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.6
  2. Affected versionversion=aca740cecbe57b12bd9c1fc632092af5ebacda0c <7af2ae1b1531feab5d38ec9c8f472dc6cceb4606
  3. Affected versionversion=aca740cecbe57b12bd9c1fc632092af5ebacda0c <dcdd49701e429c55b3644fd70fc58d85745f8cfe
  4. Affected versionversion=aca740cecbe57b12bd9c1fc632092af5ebacda0c <f9b877a7ee312ec8ce17598a7ef85cb820d7c371

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=aca740cecbe57b12bd9c1fc632092af5ebacda0c <7af2ae1b1531feab5d38ec9c8f472dc6cceb4606; version=aca740cecbe57b12bd9c1fc632092af5ebacda0c <dcdd49701e429c55b3644fd70fc58d85745f8cfe; version=aca740cecbe57b12bd9c1fc632092af5ebacda0c <f9b877a7ee312ec8ce17598a7ef85cb820d7c371

Published CVSS scores

5.5Canonical Ubuntu SecurityCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-824Access of Uninitialized Pointer
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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