#VU90222 Use-after-free in Linux kernel - CVE-2021-47142

Vulnerability identifier: #VU90222

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47142

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the amdgpu_ttm_tt_unpopulate() function in drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://git.kernel.org/stable/c/0707c3fea8102d211631ba515ef2159707561b0d
https://git.kernel.org/stable/c/3293cf3513d69f00c14d43e2020826d45ea0e46a
https://git.kernel.org/stable/c/952ab3f9f48eb0e8050596d41951cf516be6b122
https://git.kernel.org/stable/c/a849e218556f932576c0fb1c5a88714b61709a17
https://git.kernel.org/stable/c/7398c2aab4da960761ec182d04d6d5abbb4a226e
https://git.kernel.org/stable/c/f98cdf084405333ee2f5be548a91b2d168e49276
https://git.kernel.org/stable/c/d4ea141fd4b40636a8326df5a377d9c5cf9b3faa
https://git.kernel.org/stable/c/1e5c37385097c35911b0f8a0c67ffd10ee1af9a2

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.