CVE-2022-49498

Kernel crash via premature ALSA substream dereference

Published Feb 26, 2025 · Updated May 11, 2026

NULL pointer dereference in ALSA PCM memory handling in affected Linux kernel versions allows local users to crash the kernel. In snd_pcm_lib_free_pages(), the code reads substream->pcm->card before PCM_RUNTIME_CHECK verifies that substream is nonnull. A local low-privileged user must reach the ALSA PCM page-release path; a null substream triggers BUG_ON and interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.26%
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 ALSA PCM memory handling in affected Linux kernel versions allows local users to crash the kernel. In snd_pcm_lib_free_pages(), the code reads substream->pcm->card before PCM_RUNTIME_CHECK verifies that substream is nonnull. A local low-privileged user must reach the ALSA PCM page-release path; a null substream triggers BUG_ON and interrupts the host.

The record

CVE
CVE-2022-49498
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.6
  2. Affected versionversion=95b30a4312545f2dde9db12bf6a425f35d5a0d77 <b2421a196cb0911ea95aec1050a0b830464c8fa6
  3. Affected versionversion=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <011b559be832194f992f73d6c0d5485f5925a10b
  4. Affected versionversion=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <1f2e28857be1e5c7db39bbc221332215fc5467e3
  5. Affected versionversion=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <7784d22f81a29df2ec57ca90d54f93a35cbcd1a2
  6. Affected versionversion=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <b41ef7ad9238c22aa2e142f5ce4ce1a1a0d48123
  7. Affected versionversion=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <f2c68c52898f623fe84518da4606538d193b0cca

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=95b30a4312545f2dde9db12bf6a425f35d5a0d77 <b2421a196cb0911ea95aec1050a0b830464c8fa6; version=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <011b559be832194f992f73d6c0d5485f5925a10b; version=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <1f2e28857be1e5c7db39bbc221332215fc5467e3; version=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <7784d22f81a29df2ec57ca90d54f93a35cbcd1a2; version=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <b41ef7ad9238c22aa2e142f5ce4ce1a1a0d48123; version=d4cfb30fce03093ad944e0b44bd8f40bdad5330e <f2c68c52898f623fe84518da4606538d193b0cca

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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

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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-476NULL Pointer Dereference
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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