Vulnerability · Published Jun 9, 2021 · Assigned by AMD
CVE-2021-26313AMD Speculative Code Store Bypass
Medium 5.5
In plain English
A medium-severity security flaw in All supported processors from AMD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.3%top 73.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Potential speculative code store bypass in all supported CPU products, in conjunction with software vulnerabilities relating to speculative execution of overwritten instructions, may cause an incorrect speculation and could result in data leakage.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | xen | 4.14.2+25-gb6a8c4f72d-1 | DEBIAN-CVE-2021-26313 |
| Debian:13 | xen | 4.14.2+25-gb6a8c4f72d-1 | DEBIAN-CVE-2021-26313 |
| Debian:14 | xen | 4.14.2+25-gb6a8c4f72d-1 | DEBIAN-CVE-2021-26313 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-26313 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-26313 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2021-26313 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-26313 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2021-26313 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AMD | All supported processors | unspecified – before undefined |
Weakness: CWE-208