Use-after-free in AMD Zen2 processors

1) Use-after-free

EUVDB-ID: #VU78572

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-2023-20593

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error in AMD Zen2 processors. A local user can trigger a use-after-free error and execute arbitrary code on the system.

Note, the vulnerability was dubbed Zenbleed.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

AMD Ryzen 3000 Series Desktop processor: All versions

3rd Gen AMD Ryzen Threadripper processors: All versions

AMD Ryzen 4000 Series Desktop processors with Radeon graphics: All versions

AMD Ryzen 5000 Series Mobile processor with Radeon graphics: All versions

AMD Ryzen 4000 Series Mobile processors with Radeon graphics: All versions

AMD Ryzen 7020 Series Processor: All versions

AMD Generic Encapsulated Software Architecture: All versions

CPE2.3

• cpe:2.3:h:amd:amd_ryzen_3000_series_desktop_processor:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:3rd_gen_amd_ryzen_threadripper_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_4000_series_desktop_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_mobile_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_4000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:a:amd:amd_ryzen_7020_series_processor:*:*:*:*:*:*:*:*
• cpe:2.3:a:amd:agesa:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=b250b32ab1d044953af2dc5e790819a7703b7ee6
https://lock.cmpxchg8b.com/zenbleed.html
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7008.html

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.