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Vulnerability · Published Mar 2, 2022 · Assigned by redhat

CVE-2021-3715

High 7.8

In plain English

A high-severity use-after-free in kernel. 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 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.4%top 70.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.5.17-1DEBIAN-CVE-2021-3715
Debian:13linux5.5.17-1DEBIAN-CVE-2021-3715
Debian:14linux5.5.17-1DEBIAN-CVE-2021-3715
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-3715
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-3715
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3715

Affected products (as reported)

VendorProductVersions
n/a kernel Linux kernel 5.10

Weakness: CWE-416

References