CVE-2022-49292: linux kernel Memory Corruption — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: oss: Fix PCM OSS buffer allocation overflow We've got syzbot reports hitting INT_MAX overflow at vmalloc() allocation that is called from snd_pcm_plug_alloc(). Although we apply the restrictions to input parameters, it's based only on the hw_params of the underlying PCM device. Since the PCM OSS layer allocates a temporary buffer for the data conversion, the size may become unexpectedly large when more channels or higher rates is given; in the reported case, it went over INT_MAX, hence it hits WARN_ON(). This patch is an attempt to avoid such an overflow and an allocation for too large buffers. First off, it adds the limit of 1MB as the upper bound for period bytes. This must be large enough for all use cases, and we really don't want to handle a larger temporary buffer than this size. The size check is performed at two places, where the original period bytes is calculated and where the plugin buffer size is calculated. In addition, the driver uses array_size() and array3_size() for multiplications to catch overflows for the converted period size and buffer bytes.

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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-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 4.19.237
linux	linux_kernel	4.20 — 5.4.188
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	All

References

Advisories & Patches

https://git.kernel.org/stable/c/0c4190b41a69990666b4000999e27f8f1b2a426b https://git.kernel.org/stable/c/5ce74ff7059341d8b2f4d01c3383491df63d1898 https://git.kernel.org/stable/c/7a40cbf3579a8e14849ba7ce46309c1992658d2b https://git.kernel.org/stable/c/a63af1baf0a5e11827db60e3127f87e437cab6e5 https://git.kernel.org/stable/c/e74a069c6a7bb505f3ade141dddf85f4b0b5145a https://git.kernel.org/stable/c/efb6402c3c4a7c26d97c92d70186424097b6e366 https://git.kernel.org/stable/c/fb08bf99195a87c798bc8ae1357337a981faeade

Frequently Asked Questions

What is CVE-2022-49292? +

In the Linux kernel, the following vulnerability has been resolved: ALSA: oss: Fix PCM OSS buffer allocation overflow We've got syzbot reports hitting INT_MAX overflow at vmalloc() allocation that is called from snd_pcm_plug_alloc(). Although we apply the restrictions to input parameters, it's based only on the hw_params of the underlying PCM device. Since the PCM OSS layer allocates a temporary buffer for the data conversion, the size may become unexpectedly large when more channels or higher rates is given; in the reported case, it went over INT_MAX, hence it hits WARN_ON(). This patch is an attempt to avoid such an overflow and an allocation for too large buffers. First off, it adds the limit of 1MB as the upper bound for period bytes. This must be large enough for all use cases, and we really don't want to handle a larger temporary buffer than this size. The size check is performed at two places, where the original period bytes is calculated and where the plugin buffer size is calculated. In addition, the driver uses array_size() and array3_size() for multiplications to catch overflows for the converted period size and buffer bytes. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49292? +

CVE-2022-49292 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-2022-49292? +

CVE-2022-49292 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-2022-49292? +

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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