CVE-2022-49733

Host crash via unlocked OSS stream setup

Published Mar 2, 2025 · Updated Aug 5, 2026

NULL pointer dereference in the Linux kernel allows local users to crash the host via concurrent ALSA OSS PCM ioctl calls. snd_pcm_oss_sync() calls snd_pcm_oss_make_ready() before acquiring params_lock, allowing another thread to reconfigure the stream and leave OSS buffer state inconsistent. Access to an OSS PCM device such as /dev/dsp and concurrent ioctl calls are required; a successful race can dereference a NULL buffer and interrupt the host.

CVSS severity7.8
High
EPSS probability0.15%
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 allows local users to crash the host via concurrent ALSA OSS PCM ioctl calls. snd_pcm_oss_sync() calls snd_pcm_oss_make_ready() before acquiring params_lock, allowing another thread to reconfigure the stream and leave OSS buffer state inconsistent. Access to an OSS PCM device such as /dev/dsp and concurrent ioctl calls are required; a successful race can dereference a NULL buffer and interrupt the host.

The record

CVE
CVE-2022-49733
Published
Mar 2, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 2025CVE 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=2.6.20
  2. Affected versionversion=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <4051324a6dafd7053c74c475e80b3ba10ae672b0
  3. Affected versionversion=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <723ac5ab2891b6c10dd6cc78ef5456af593490eb
  4. Affected versionversion=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <8015ef9e8a0ee5cecfd0cb6805834d007ab26f86
  5. Affected versionversion=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <8423f0b6d513b259fdab9c9bf4aaa6188d054c2d
  6. Affected versionversion=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <fce793a056c604b41a298317cf704dae255f1b36

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.20; version=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <4051324a6dafd7053c74c475e80b3ba10ae672b0; version=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <723ac5ab2891b6c10dd6cc78ef5456af593490eb; version=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <8015ef9e8a0ee5cecfd0cb6805834d007ab26f86; version=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <8423f0b6d513b259fdab9c9bf4aaa6188d054c2d; version=e3a5d59a17e9a42e3f3e0e37342b2679bab2ff43 <fce793a056c604b41a298317cf704dae255f1b36

Published CVSS scores

4.7CISA ADP VulnrichmentCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CVE TeamCVSS: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
T1499.004Endpoint Denial of Service: Application 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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