CVE-2020-36788: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: avoid a use-after-free when BO init fails nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code back to the caller. On failures, ttm_bo_init() invokes the provided destructor which should de-initialize and free the memory. Thus, when nouveau_bo_init() returns an error the gem object has already been released and the memory freed by nouveau_bo_del_ttm().

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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	5.4 — 5.10.73
linux	linux_kernel	5.11 — 5.14.12
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54 https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96 https://git.kernel.org/stable/c/548f2ff8ea5e0ce767ae3418d1ec5308990be87d https://git.kernel.org/stable/c/bcf34aa5082ee2343574bc3f4d1c126030913e54 https://git.kernel.org/stable/c/f86e19d918a85492ad1a01fcdc0ad5ecbdac6f96

Frequently Asked Questions

What is CVE-2020-36788? +

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: avoid a use-after-free when BO init fails nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code back to the caller. On failures, ttm_bo_init() invokes the provided destructor which should de-initialize and free the memory. Thus, when nouveau_bo_init() returns an error the gem object has already been released and the memory freed by nouveau_bo_del_ttm(). It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2020-36788? +

CVE-2020-36788 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-2020-36788? +

CVE-2020-36788 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-2020-36788? +

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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CVE-2020-36788