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Vulnerability · Published Aug 2, 2021 · Assigned by mitre

CVE-2021-35477

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 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.5%top 60.0% 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 a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-4DEBIAN-CVE-2021-35477
Debian:13linux5.10.46-4DEBIAN-CVE-2021-35477
Debian:14linux5.10.46-4DEBIAN-CVE-2021-35477
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-35477
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-35477
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-35477

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References