CVE-2021-47006

low-risk
Published 2024-02-28

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/

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (16)

Patch https://git.kernel.org/stable/c/3ed8832aeaa9a37b0fc386bb72ff604352567c80
Patch https://git.kernel.org/stable/c/555a70f7fff03bd669123487905c47ae27dbdaac
Patch https://git.kernel.org/stable/c/630146203108bf6b8934eec0dfdb3e46dcb917de
Patch https://git.kernel.org/stable/c/7eeacc6728c5478e3c01bc82a1f08958eaa12366
Patch https://git.kernel.org/stable/c/a506bd5756290821a4314f502b4bafc2afcf5260
Patch https://git.kernel.org/stable/c/a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb
Patch https://git.kernel.org/stable/c/dabe299425b1a53a69461fed7ac8922ea6733a25
Patch https://git.kernel.org/stable/c/ed1f67465327cec4457bb988775245b199da86e6
Patch https://git.kernel.org/stable/c/3ed8832aeaa9a37b0fc386bb72ff604352567c80
Patch https://git.kernel.org/stable/c/555a70f7fff03bd669123487905c47ae27dbdaac
Patch https://git.kernel.org/stable/c/630146203108bf6b8934eec0dfdb3e46dcb917de
Patch https://git.kernel.org/stable/c/7eeacc6728c5478e3c01bc82a1f08958eaa12366
Patch https://git.kernel.org/stable/c/a506bd5756290821a4314f502b4bafc2afcf5260
Patch https://git.kernel.org/stable/c/a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb
Patch https://git.kernel.org/stable/c/dabe299425b1a53a69461fed7ac8922ea6733a25
Patch https://git.kernel.org/stable/c/ed1f67465327cec4457bb988775245b199da86e6
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal