CVE-2022-49291

ALSA: pcm: Fix races among concurrent hw_params and hw_free calls

State: Published
Severity: 7.8 High
Published: Feb 26, 2025
Updated: Aug 5, 2026
Reserved: Feb 26, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: Fix races among concurrent hw_params and hw_free calls

Currently we have neither proper check nor protection against the concurrent calls of PCM hw_params and hw_free ioctls, which may result in a UAF. Since the existing PCM stream lock can't be used for protecting the whole ioctl operations, we need a new mutex to protect those racy calls.

This patch introduced a new mutex, runtime->buffer_mutex, and applies it to both hw_params and hw_free ioctl code paths. Along with it, the both functions are slightly modified (the mmap_count check is moved into the state-check block) for code simplicity.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a42aa926843acca96c0dfbde2e835b8137f2f092Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9cb6c40a6ebe4a0cfc9d6a181958211682cffea9Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fbeb492694ce0441053de57699e1e2b7bc148a69Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0f6947f5f5208f6ebd4d76a82a4757e2839a23f8Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 33061d0fba51d2bf70a2ef9645f703c33fe8e438Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0090c13cbbdffd7da079ac56f80373a9a1be0bf8Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1bbf82d9f961414d6c76a08f7f843ea068e0ab7bAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 92ee3c60ec9fe64404dc035e7c41277d74aa26cbAffected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 4.14.279 through 4.14.Not affected 4.19.243 through 4.19.Not affected 5.4.193 through 5.4.Not affected 5.10.109 through 5.10.Not affected 5.15.32 through 5.15.Not affected 5.16.18 through 5.16.Not affected 5.17.1 through 5.17.*Not affected 5.18 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a42aa926843acca96c0dfbde2e835b8137f2f092Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9cb6c40a6ebe4a0cfc9d6a181958211682cffea9Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fbeb492694ce0441053de57699e1e2b7bc148a69Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0f6947f5f5208f6ebd4d76a82a4757e2839a23f8Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 33061d0fba51d2bf70a2ef9645f703c33fe8e438Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0090c13cbbdffd7da079ac56f80373a9a1be0bf8Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1bbf82d9f961414d6c76a08f7f843ea068e0ab7bAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 92ee3c60ec9fe64404dc035e7c41277d74aa26cbAffected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
4.14.279 through 4.14.*Not affected
4.19.243 through 4.19.*Not affected
5.4.193 through 5.4.*Not affected
5.10.109 through 5.10.*Not affected
5.15.32 through 5.15.*Not affected
5.16.18 through 5.16.*Not affected
5.17.1 through 5.17.*Not affected
5.18 and laterNot affected

References

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