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Vulnerability · Published Aug 24, 2022 · Assigned by redhat

CVE-2021-4159

Medium 4.4

In plain English

A medium-severity security flaw in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.4Medium
Exploit odds (30 days)0.2%top 83.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.7.6-1DEBIAN-CVE-2021-4159
Debian:13linux5.7.6-1DEBIAN-CVE-2021-4159
Debian:14linux5.7.6-1DEBIAN-CVE-2021-4159
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-4159
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-4159
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-4159

Affected products (as reported)

VendorProductVersions
n/a kernel Fixed in v5.7-rc1

Weakness: CWE-202

References