CVE-2022-49288

Kernel memory corruption via unlocked PCM preallocation writes

Published Feb 26, 2025 · Updated May 11, 2026

Use-after-free in ALSA PCM preallocation in Linux allows local users with proc-write access to corrupt kernel memory through concurrent writes. The snd_pcm_lib_preallocate_proc_write function changes DMA-buffer allocation without taking open_mutex, allowing it to race with PCM stream opens and later operations. The proc entry is root-owned and mode 0644, so exploitation requires UID 0 or CAP_DAC_OVERRIDE; the published impact is memory corruption, not a demonstrated privilege gain.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in ALSA PCM preallocation in Linux allows local users with proc-write access to corrupt kernel memory through concurrent writes. The snd_pcm_lib_preallocate_proc_write function changes DMA-buffer allocation without taking open_mutex, allowing it to race with PCM stream opens and later operations. The proc entry is root-owned and mode 0644, so exploitation requires UID 0 or CAP_DAC_OVERRIDE; the published impact is memory corruption, not a demonstrated privilege gain.

The record

CVE
CVE-2022-49288
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
admin

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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37b12c16beb6f6c1c3c678c1aacbc46525c250f7
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51fce708ab8986a9879ee5da946a2cc120f1036d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ed8f8e3c4e59d0396b9ccf2e639711e24295bb6
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69534c48ba8ce552ce383b3dfdb271ffe51820c3
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a21d2f323b5a978dedf9ff1d50f101f85e39b3f2
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b560d670c87d7d40b3cf6949246fa4c7aa65a00a
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e14dca613e0a6ddc2bf6e360f16936a9f865205b
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7786c445bb67a9a6e64f66ebd6b7215b153ff7d
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37b12c16beb6f6c1c3c678c1aacbc46525c250f7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <51fce708ab8986a9879ee5da946a2cc120f1036d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ed8f8e3c4e59d0396b9ccf2e639711e24295bb6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69534c48ba8ce552ce383b3dfdb271ffe51820c3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a21d2f323b5a978dedf9ff1d50f101f85e39b3f2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b560d670c87d7d40b3cf6949246fa4c7aa65a00a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e14dca613e0a6ddc2bf6e360f16936a9f865205b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7786c445bb67a9a6e64f66ebd6b7215b153ff7d; version=2.6.12

Published CVSS scores

7.8CISA-ADPCVSS: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

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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