CVE-2022-48994

Local kernel panic via mismatched sequencer callbacks

Published Oct 21, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel ALSA sequencer allows local users to trigger a kernel panic or thread termination. In snd_seq_expand_var_event, seq_copy_in_user and seq_copy_in_kernel are cast to snd_seq_dump_func_t despite incompatible callback prototypes, so kCFI rejects the indirect call target at runtime. Reaching the failure requires local access to an affected kernel built with CONFIG_CFI_CLANG; the result is limited to a killed thread or kernel panic.

CVSS severity5.5
Medium
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

Denial of service in the Linux kernel ALSA sequencer allows local users to trigger a kernel panic or thread termination. In snd_seq_expand_var_event, seq_copy_in_user and seq_copy_in_kernel are cast to snd_seq_dump_func_t despite incompatible callback prototypes, so kCFI rejects the indirect call target at runtime. Reaching the failure requires local access to an affected kernel built with CONFIG_CFI_CLANG; the result is limited to a killed thread or kernel panic.

The record

CVE
CVE-2022-48994
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <05530ef7cf7c7d700f6753f058999b1b5099a026
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <13ee8fb5410b740c8dd2867d3557c7662f7dda2d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15c42ab8d43acb73e2eba361ad05822c0af0ecfa
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f46e95bf344abc4e74f8158901d32a869e0adb6
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <63badfed200219ca656968725f1a43df293ac936
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b38486e82ecb9f3046e0184205f6b61408fc40c9
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e385360705a0b346bdb57ce938249175d0613b8a
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fccd454129f6a0739651f7f58307cdb631fd6e89
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <05530ef7cf7c7d700f6753f058999b1b5099a026; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <13ee8fb5410b740c8dd2867d3557c7662f7dda2d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15c42ab8d43acb73e2eba361ad05822c0af0ecfa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f46e95bf344abc4e74f8158901d32a869e0adb6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <63badfed200219ca656968725f1a43df293ac936; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b38486e82ecb9f3046e0184205f6b61408fc40c9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e385360705a0b346bdb57ce938249175d0613b8a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fccd454129f6a0739651f7f58307cdb631fd6e89; version=2.6.12

Published CVSS scores

5.5NIST NVDCVSS: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

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 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

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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