CVE-2022-49556: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.

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CVSS v3.1 Score

7.1

HIGH

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.7 — 5.10.124
linux	linux_kernel	5.11 — 5.15.45
linux	linux_kernel	5.16 — 5.17.13
linux	linux_kernel	5.18 — 5.18.2

References

Advisories & Patches

https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93 https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0 https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403 https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418

Frequently Asked Questions

What is CVE-2022-49556? +

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2022-49556? +

CVE-2022-49556 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49556? +

CVE-2022-49556 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-2022-49556? +

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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