CVE-2022-49709 Details
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.
A vulnerability in the Linux kernel's handling of Read-Copy-Update (RCU) synchronization has been addressed. The issue arose in the cpuidle code path, where improper RCU state management during the __cfi_slowpath_diag function could lead to an invalid RCU state. This mismanagement triggered a warning in the kernel, indicating a problem with the RCU synchronization process. The vulnerability has been resolved by modifying the RCU usage to ensure proper synchronization, only waking up RCU when necessary and disabling interrupts during critical checks.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/57cd6d157eb479f0a8e820fd36b7240845c8a937 | kernel.org | Patch |
| https://git.kernel.org/stable/c/75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5ed | kernel.org | Patch |
| https://git.kernel.org/stable/c/ca3897f2ac02ceae5e6fa794f83c36f9885b93da | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.13, < 5.15.49 >= 5.16, < 5.18.6 5.19 rc1 5.19 rc2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Oct 24, 2025 | Initial Analysis | [email protected] |
| Feb 26, 2025 | New CVE Received | kernel.org |