CVE-2022-49709

cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle

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.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5ed
https://git.kernel.org/stable/c/ca3897f2ac02ceae5e6fa794f83c36f9885b93da
https://git.kernel.org/stable/c/57cd6d157eb479f0a8e820fd36b7240845c8a937

Frequently Asked Questions

What is the severity of CVE-2022-49709?: CVE-2022-49709 has not yet been assigned a CVSS score.
How to fix CVE-2022-49709?: To fix CVE-2022-49709, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49709 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49709 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49709?: CVE-2022-49709 affects Linux Linux, Linux Linux.

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