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CVE-2021-47617

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault The Power Fault Detected bit in the Slot Status register differs…

Published Jun 20, 2024CWE-835EPSS 0.21%

Overview

CVE-2021-47617 is a medium-severity vulnerability. It was published on June 20, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

PCI: pciehp: Fix infinite loop in IRQ handler upon power fault

The Power Fault Detected bit in the Slot Status register differs from

all other hotplug events in that it is sticky: It can only be cleared

after turning off slot power. Per PCIe r5.0, sec. 6.7.1.8:

If a power controller detects a main power fault on the hot-plug slot,

it must automatically set its internal main power fault latch [...].

The main power fault latch is cleared when software turns off power to

the hot-plug slot.

The stickiness used to cause interrupt storms and infinite loops which

were fixed in 2009 by commits 5651c48cfafe ("PCI pciehp: fix power fault

interrupt storm problem") and 99f0169c17f3 ("PCI: pciehp: enable

software notification on empty slots").

Unfortunately in 2020 the infinite loop issue was inadvertently

reintroduced by commit 8edf5332c393 ("PCI: pciehp: Fix MSI interrupt

race"): The hardirq handler pciehp_isr() c

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1db58c6584a72102e98af2e600ea184ddaf2b8afRefgit.kernel.org/stable/c/23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12Refgit.kernel.org/stable/c/3b4c966fb156ff3e70b2526d964952ff7c1574d9Refgit.kernel.org/stable/c/464da38ba827f670deac6500a1de9a4f0f44c41dRefgit.kernel.org/stable/c/6d6f1f0dac3e3441ecdb1103d4efb11b9ed24dd5Refgit.kernel.org/stable/c/ff27f7d0333cff89ec85c419f431aca1b38fb16aRefgit.kernel.org/stable/c/1db58c6584a72102e98af2e600ea184ddaf2b8afRefgit.kernel.org/stable/c/23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12Refgit.kernel.org/stable/c/3b4c966fb156ff3e70b2526d964952ff7c1574d9Refgit.kernel.org/stable/c/464da38ba827f670deac6500a1de9a4f0f44c41d

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47617?

CVE-2021-47617 is a medium-severity vulnerability. It was published on June 20, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47617?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47617?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47617?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47617 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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