CVE-2025-38049

Kernel crash via resctrl CLOSID allocation

Published Apr 18, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux x86 resctrl allows local users to crash the kernel by creating a resource control group. The CLOSID selection path reads closid_num_dirty_rmid even when dom_data_init has not allocated that array on systems without LLC occupancy counters. Reachability requires an x86 platform without cache-occupancy monitors and permission to create a resctrl control group.

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

NULL pointer dereference in Linux x86 resctrl allows local users to crash the kernel by creating a resource control group. The CLOSID selection path reads closid_num_dirty_rmid even when dom_data_init has not allocated that array on systems without LLC occupancy counters. Reachability requires an x86 platform without cache-occupancy monitors and permission to create a resctrl control group.

The record

CVE
CVE-2025-38049
Published
Apr 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 18, 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=6.9
  2. Affected versionversion=6eac36bb9eb0349c983313c71692c19d50b56878 <93a418fc61da13d1ee4047d4d1327990f7a2816a
  3. Affected versionversion=6eac36bb9eb0349c983313c71692c19d50b56878 <a121798ae669351ec0697c94f71c3a692b2a755b
  4. Affected versionversion=6eac36bb9eb0349c983313c71692c19d50b56878 <a8a1bcc27d4607227088d80483164289b5348293
  5. Affected versionversion=6eac36bb9eb0349c983313c71692c19d50b56878 <ed5addb55e403ad6598102bcf546e068ae01fef6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=6eac36bb9eb0349c983313c71692c19d50b56878 <93a418fc61da13d1ee4047d4d1327990f7a2816a; version=6eac36bb9eb0349c983313c71692c19d50b56878 <a121798ae669351ec0697c94f71c3a692b2a755b; version=6eac36bb9eb0349c983313c71692c19d50b56878 <a8a1bcc27d4607227088d80483164289b5348293; version=6eac36bb9eb0349c983313c71692c19d50b56878 <ed5addb55e403ad6598102bcf546e068ae01fef6

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 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-476NULL Pointer Dereference
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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