CVE-2022-48636

Kernel crash via unlocked pavgroup race

Published Apr 28, 2024 · Updated Aug 5, 2026

NULL pointer dereference in the Linux kernel s390 DASD driver allows local users to crash the kernel through a device-update race. dasd_alias_get_start_dev() checks pavgroup without holding lcu->lock, allowing _lcu_update() to clear the pointer before it is dereferenced. Reaching the flaw requires local low-privileged access and use of the affected s390 DASD alias path; the bounded consequence is a kernel Oops and service interruption.

CVSS severity7.8
High
EPSS probability0.24%
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 the Linux kernel s390 DASD driver allows local users to crash the kernel through a device-update race. dasd_alias_get_start_dev() checks pavgroup without holding lcu->lock, allowing _lcu_update() to clear the pointer before it is dereferenced. Reaching the flaw requires local low-privileged access and use of the affected s390 DASD alias path; the bounded consequence is a kernel Oops and service interruption.

The record

CVE
CVE-2022-48636
Published
Apr 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2.6.25
  2. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <2e473351400e3dd66f0b71eddcef82ee45a584c1
  3. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <49f401a98b318761ca2e15d4c7869a20043fbed4
  4. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <650a2e79d176db753654d3dde88e53a2033036ac
  5. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <aaba5ff2742043705bc4c02fd0b2b246e2e16da1
  6. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <d3a67c21b18f33c79382084af556557c442f12a6
  7. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <d86b4267834e6d4af62e3073e48166e349ab1b70
  8. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <db7ba07108a48c0f95b74fabbfd5d63e924f992d
  9. Affected versionversion=8e09f21574ea3028d5629e5de759e0b196c690c5 <f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <2e473351400e3dd66f0b71eddcef82ee45a584c1; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <49f401a98b318761ca2e15d4c7869a20043fbed4; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <650a2e79d176db753654d3dde88e53a2033036ac; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <aaba5ff2742043705bc4c02fd0b2b246e2e16da1; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <d3a67c21b18f33c79382084af556557c442f12a6; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <d86b4267834e6d4af62e3073e48166e349ab1b70; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <db7ba07108a48c0f95b74fabbfd5d63e924f992d; version=8e09f21574ea3028d5629e5de759e0b196c690c5 <f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b

Published CVSS scores

5.5CISA ADP VulnrichmentCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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Technologies

Your stack

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Your stack

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