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CVE-2022-49709

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle RCU_NONIDLE usage during __cfi_slowpath_diag can result in an invalid RCU s…

Published Feb 26, 2025EPSS 0.26%

Overview

CVE-2022-49709 is a medium-severity vulnerability. It was published on February 26, 2025 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:

cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle

RCU_NONIDLE usage during __cfi_slowpath_diag can result in an invalid

RCU state in the cpuidle code path:

WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:613 rcu_eqs_enter+0xe4/0x138

...

Call trace:

rcu_eqs_enter+0xe4/0x138

rcu_idle_enter+0xa8/0x100

cpuidle_enter_state+0x154/0x3a8

cpuidle_enter+0x3c/0x58

do_idle.llvm.6590768638138871020+0x1f4/0x2ec

cpu_startup_entry+0x28/0x2c

secondary_start_kernel+0x1b8/0x220

__secondary_switched+0x94/0x98

Instead, call rcu_irq_enter/exit to wake up RCU only when needed and

disable interrupts for the entire CFI shadow/module check when we do.

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/57cd6d157eb479f0a8e820fd36b7240845c8a937Refgit.kernel.org/stable/c/75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5edRefgit.kernel.org/stable/c/ca3897f2ac02ceae5e6fa794f83c36f9885b93da

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49709?

CVE-2022-49709 is a medium-severity vulnerability. It was published on February 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49709?

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-2022-49709?

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-2022-49709?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49709 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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