CVE-2025-22030

Kernel task hangs via zswap lock inversion

Published Apr 16, 2025 · Updated May 23, 2026

Improper locking in Linux 6.12.12 through 6.12.22 and 6.13 allows local users to hang kernel tasks during CPU hot-unplug. zswap_cpu_comp_dead() calls crypto_free_acomp() while holding acomp_ctx, reversing the scomp_lock-to-acomp_ctx order used during allocation and reclaim. Reachability requires concurrent zswap memory reclaim and CPU offlining; the resulting ABBA deadlock blocks kernel work and affects availability only.

CVSS severity5.5
Medium
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

Improper locking in Linux 6.12.12 through 6.12.22 and 6.13 allows local users to hang kernel tasks during CPU hot-unplug. zswap_cpu_comp_dead() calls crypto_free_acomp() while holding acomp_ctx, reversing the scomp_lock-to-acomp_ctx order used during allocation and reclaim. Reachability requires concurrent zswap memory reclaim and CPU offlining; the resulting ABBA deadlock blocks kernel work and affects availability only.

The record

CVE
CVE-2025-22030
Published
Apr 16, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=12dcb0ef540629a281533f9dedc1b6b8e14cfb65 <717d9c35deff6c33235693171bacbb03e9643fa4
  2. Affected versionversion=12dcb0ef540629a281533f9dedc1b6b8e14cfb65 <a8d18000e9d2d97aaf105f5f9b3b0e8a6fbf8b96
  3. Affected versionversion=12dcb0ef540629a281533f9dedc1b6b8e14cfb65 <c11bcbc0a517acf69282c8225059b2a8ac5fe628
  4. Affected versionversion=6.12.12 <6.12.23
  5. Affected versionversion=6.13
  6. Affected versionversion=8d29ff5d50304daa41dc3cfdda4a9d1e46cf5be1 <747e3eec1d7d124ea90ed3d7b85369df8b4e36d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=12dcb0ef540629a281533f9dedc1b6b8e14cfb65 <717d9c35deff6c33235693171bacbb03e9643fa4; version=12dcb0ef540629a281533f9dedc1b6b8e14cfb65 <a8d18000e9d2d97aaf105f5f9b3b0e8a6fbf8b96; version=12dcb0ef540629a281533f9dedc1b6b8e14cfb65 <c11bcbc0a517acf69282c8225059b2a8ac5fe628; version=6.12.12 <6.12.23; version=6.13; version=8d29ff5d50304daa41dc3cfdda4a9d1e46cf5be1 <747e3eec1d7d124ea90ed3d7b85369df8b4e36d2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS: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-833Deadlock
CWE-667Improper Locking
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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