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Vulnerability · Published Apr 2, 2020 · Assigned by canonical

CVE-2020-8835Linux kernel bpf verifier vulnerability

High 7.8

In plain English

A high-severity security flaw in Linux kernel from Linux kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.0% (higher than 93% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)6.0%top 6.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.5.13-2DEBIAN-CVE-2020-8835
Debian:13linux5.5.13-2DEBIAN-CVE-2020-8835
Debian:14linux5.5.13-2DEBIAN-CVE-2020-8835

Affected products (as reported)

VendorProductVersions
Linux kernel Linux kernel 5.6-stable – before 5.6.15.5-stable – before 5.5.145.4.7 – before 5.4-stable*

References