Vulnerability · Published May 28, 2021 · Assigned by redhat
CVE-2021-20239
Low 3.3
In plain English
A low-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 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)3.3Low
Exploit odds (30 days)0.3%top 82.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-348.el8 | ALSA-2021:4356 |
| Debian:12 | linux | 5.10.4-1 | DEBIAN-CVE-2021-20239 |
| Debian:13 | linux | 5.10.4-1 | DEBIAN-CVE-2021-20239 |
| Debian:14 | linux | 5.10.4-1 | DEBIAN-CVE-2021-20239 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2021-20239 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2021-20239 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2021-20239 |
Affected products (as reported)
Weakness: CWE-822
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1923636 x_refsource_MISC