CVE-2021-47006: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook The commit 1879445dfa7b ("perf/core: Set event's default ::overflow_handler()") set a default event->overflow_handler in perf_event_alloc(), and replace the check event->overflow_handler with is_default_overflow_handler(), but one is missing. Currently, the bp->overflow_handler can not be NULL. As a result, enable_single_step() is always not invoked. Comments from Zhen Lei: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210207105934.2001-1-thunder.leizhen@huawei.com/

Affected products

• Linux Linux Kernel: from 4.7, before 4.9.269 (fixed in 4.9.269); from 4.10, before 4.14.233 (fixed in 4.14.233); from 4.15, before 4.19.191 (fixed in 4.19.191); from 4.20, before 5.4.120 (fixed in 5.4.120); from 5.5, before 5.10.38 (fixed in 5.10.38); from 5.11, before 5.11.22 (fixed in 5.11.22); …

Published 2024-02-28. Last modified 2026-06-17.