PT-2021-4417 · Amd · Amd Cpus

Daniel Gruss + 2 · Published 2021-10-13 · Updated 2021-10-20 · CVE-2021-26318

Positive Technologies (AI Summary)

CVSS v2.0

4.9

Medium

Base vector

AV:L/AC:L/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions AMD CPUs (affected versions not specified)

Description A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information. This issue is related to a Meltdown-type attack, which was initially thought not to affect AMD processors. The attack may allow an attacker to disclose kernel address space information using a side channel.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Side Channel Attack

Information Disclosure

Weakness Enumeration

CWE-203

CWE-208

CWE-200

Related Identifiers

BDU:2021-05047

CVE-2021-26318

Affected Products

Amd Cpus

References · 15

• https://nvd.nist.gov/vuln/detail/CVE-2021-26318 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-26318 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-26318 · Security Note
• https://amd.com/en/corporate/product-security/bulletin/amd-sb-1017 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-26318 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05047 · Security Note
• https://t.me/tmfeed/124208 · Telegram Post
• https://xakep.ru/2021/10/14/amd-meltdown · Note
• https://t.me/cibsecurity/30532 · Telegram Post
• https://arxiv.org/abs/2108.10771 · Note
• https://cispa.de/en/research/publications/3507-amd-prefetch-attacks-through-power-and-time · Note
• https://securitylab.ru/news/525605.php · Note
• https://t.me/isacarusec/4548 · Telegram Post
• https://t.me/opennews/9197 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2021101403 · Note