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Vulnerability · Published Apr 20, 2021 · Assigned by mitre

CVE-2021-29155

Medium 5.5

In plain English

A medium-severity security flaw in the kernel-tools-libs-devel package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)1.1%top 35.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-tools-libs-devel4.18.0-348.el8ALSA-2021:4356
Debian:12linux5.10.38-1DEBIAN-CVE-2021-29155
Debian:13linux5.10.38-1DEBIAN-CVE-2021-29155
Debian:14linux5.10.38-1DEBIAN-CVE-2021-29155
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-29155
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-29155
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-29155

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References