CVE-2022-49291: linux kernel Use-After-Free — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 4.14.279
linux	linux_kernel	4.15 — 4.19.243
linux	linux_kernel	4.20 — 5.4.193
linux	linux_kernel	5.5 — 5.10.109
linux	linux_kernel	5.11 — 5.15.32
linux	linux_kernel	5.16 — 5.16.18
linux	linux_kernel	5.17 — 5.17.1

References

Advisories & Patches

https://git.kernel.org/stable/c/0090c13cbbdffd7da079ac56f80373a9a1be0bf8 https://git.kernel.org/stable/c/0f6947f5f5208f6ebd4d76a82a4757e2839a23f8 https://git.kernel.org/stable/c/1bbf82d9f961414d6c76a08f7f843ea068e0ab7b https://git.kernel.org/stable/c/33061d0fba51d2bf70a2ef9645f703c33fe8e438 https://git.kernel.org/stable/c/92ee3c60ec9fe64404dc035e7c41277d74aa26cb https://git.kernel.org/stable/c/9cb6c40a6ebe4a0cfc9d6a181958211682cffea9 https://git.kernel.org/stable/c/a42aa926843acca96c0dfbde2e835b8137f2f092 https://git.kernel.org/stable/c/fbeb492694ce0441053de57699e1e2b7bc148a69

Frequently Asked Questions

What is CVE-2022-49291? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49291? +

CVE-2022-49291 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49291? +

CVE-2022-49291 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49291? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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