Log in Start free

Vulnerability · Published Aug 2, 2021 · Assigned by mitre

CVE-2021-34556

Medium 5.5

In plain English

A medium-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 63.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-4DEBIAN-CVE-2021-34556
Debian:13linux5.10.46-4DEBIAN-CVE-2021-34556
Debian:14linux5.10.46-4DEBIAN-CVE-2021-34556
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-34556
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-34556
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-34556

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References