CVE-2022-48921

Kernel crash via scheduler priority race

Published Aug 22, 2024 · Updated May 23, 2026

Race condition in the Linux kernel scheduler allows local users to crash the system by changing thread-group priorities during fork. setpriority(PRIO_PGRP) can reach a TASK_NEW thread before sched_post_fork initializes its CFS run-queue pointer, causing reweight_entity to dereference null. Triggering the race requires local low-privileged execution and concurrent thread creation and priority changes; the bounded consequence is a kernel crash and service interruption.

CVSS severity4.7
Medium
EPSS probability0.17%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel scheduler allows local users to crash the system by changing thread-group priorities during fork. setpriority(PRIO_PGRP) can reach a TASK_NEW thread before sched_post_fork initializes its CFS run-queue pointer, causing reweight_entity to dereference null. Triggering the race requires local low-privileged execution and concurrent thread creation and priority changes; the bounded consequence is a kernel crash and service interruption.

The record

CVE
CVE-2022-48921
Published
Aug 22, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE 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=25d40b828fb855ee62e1039c65a666c9afd60786
  2. Affected versionversion=3869eecf050416a1d19bac60926f6b5d64b0aa58 <e0bcd6b5779352aed88f2e538a82a39f1a7715bb
  3. Affected versionversion=4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a <13765de8148f71fa795e0a6607de37c49ea5915a
  4. Affected versionversion=4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a <589a954daab5e18399860b6c8ffaeaf79844eb20
  5. Affected versionversion=5.10.80 <5.10.137
  6. Affected versionversion=5.14.19 <5.15
  7. Affected versionversion=5.15.3 <5.15.27
  8. Affected versionversion=5.16
  9. Affected versionversion=c85c6fadbef0a3eab41540ea628fa8fe8928c820 <8f317cd888059c59e2fa924bf4b0957cfa53f78e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=25d40b828fb855ee62e1039c65a666c9afd60786; version=3869eecf050416a1d19bac60926f6b5d64b0aa58 <e0bcd6b5779352aed88f2e538a82a39f1a7715bb; version=4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a <13765de8148f71fa795e0a6607de37c49ea5915a; version=4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a <589a954daab5e18399860b6c8ffaeaf79844eb20; version=5.10.80 <5.10.137; version=5.14.19 <5.15; version=5.15.3 <5.15.27; version=5.16; version=c85c6fadbef0a3eab41540ea628fa8fe8928c820 <8f317cd888059c59e2fa924bf4b0957cfa53f78e

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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