CVE-2026-23199

Local system hang via procfs lock inversion

Published Feb 14, 2026 · Updated Feb 14, 2026

Improper locking in Linux Kernel 6.11 through 6.12.69 and 6.13 through 6.18.9 allows local users to hang the system via PROCMAP_QUERY. do_procmap_query fetches an optional file build ID while retaining mmap_lock or a per-VMA lock, permitting inverse acquisition with the block-device inode lock. A low-privileged local process must issue the procfs maps ioctl against a suitable file-backed VMA; successful triggering deadlocks the kernel and interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux Kernel 6.11 through 6.12.69 and 6.13 through 6.18.9 allows local users to hang the system via PROCMAP_QUERY. do_procmap_query fetches an optional file build ID while retaining mmap_lock or a per-VMA lock, permitting inverse acquisition with the block-device inode lock. A low-privileged local process must issue the procfs maps ioctl against a suitable file-backed VMA; successful triggering deadlocks the kernel and interrupts the host.

The record

CVE
CVE-2026-23199
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=6.11
  2. Affected versionversion=ed5d583a88a9207b866c14ba834984c6f3c51d23 <b5cbacd7f86f4f62b8813688c8e73be94e8e1951
  3. Affected versionversion=ed5d583a88a9207b866c14ba834984c6f3c51d23 <b9b97e6aeb534315f9646b2090d1a5024c6a4e82
  4. Affected versionversion=ed5d583a88a9207b866c14ba834984c6f3c51d23 <cbc03ce3e6ce7e21214c3f02218213574c1a2d08

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=ed5d583a88a9207b866c14ba834984c6f3c51d23 <b5cbacd7f86f4f62b8813688c8e73be94e8e1951; version=ed5d583a88a9207b866c14ba834984c6f3c51d23 <b9b97e6aeb534315f9646b2090d1a5024c6a4e82; version=ed5d583a88a9207b866c14ba834984c6f3c51d23 <cbc03ce3e6ce7e21214c3f02218213574c1a2d08

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.

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

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-667Improper Locking
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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