CVE-2021-47006

MEDIUM
Published Feb 28, 2024 Modified Mar 19, 2025

Description

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/[email protected]/

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/3ed8832aeaa9a37b0fc386bb72ff604352567c80 https://git.kernel.org/stable/c/555a70f7fff03bd669123487905c47ae27dbdaac https://git.kernel.org/stable/c/630146203108bf6b8934eec0dfdb3e46dcb917de https://git.kernel.org/stable/c/7eeacc6728c5478e3c01bc82a1f08958eaa12366 https://git.kernel.org/stable/c/a506bd5756290821a4314f502b4bafc2afcf5260 https://git.kernel.org/stable/c/a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb https://git.kernel.org/stable/c/dabe299425b1a53a69461fed7ac8922ea6733a25 https://git.kernel.org/stable/c/ed1f67465327cec4457bb988775245b199da86e6 https://git.kernel.org/stable/c/3ed8832aeaa9a37b0fc386bb72ff604352567c80 https://git.kernel.org/stable/c/555a70f7fff03bd669123487905c47ae27dbdaac https://git.kernel.org/stable/c/630146203108bf6b8934eec0dfdb3e46dcb917de https://git.kernel.org/stable/c/7eeacc6728c5478e3c01bc82a1f08958eaa12366 https://git.kernel.org/stable/c/a506bd5756290821a4314f502b4bafc2afcf5260 https://git.kernel.org/stable/c/a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb https://git.kernel.org/stable/c/dabe299425b1a53a69461fed7ac8922ea6733a25 https://git.kernel.org/stable/c/ed1f67465327cec4457bb988775245b199da86e6

Frequently Asked Questions

What is CVE-2021-47006? +
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/[email protected]/ It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47006? +
CVE-2021-47006 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47006? +
CVE-2021-47006 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47006? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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