CVE-2021-34447.8HighCWE-681

CVE-2021-3444: Linux kernel bpf verifier incorrect mod32 truncation

Linux · kernel

Vendor fix available · Affected: Linux kernel · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.6%probability of exploitation in the next 30 days

49th percentile

050100

Higher than 49% of scored CVEs

7.8HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Linux · kernelfrom trunk before 5.12-rc1; from 5.11 before 5.11.2; from 5.10 before 5.10.19; from 5.4 before 5.4.101

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Incorrect Conversion between Numeric Types · Memory Corruption
Vendor: Linux
Published: March 2021
Band: Unlikely (under 1%), March 2021

CoverageNo articles yet

No CyberSIXT article names CVE-2021-3444 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.