Riskcovery

CVE-2022-49709

cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle

State
Published
Severity
Not scored
Published
Feb 26, 2025
Updated
May 11, 2026
Reserved
Feb 26, 2025

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • cf68fffb66d60d96209446bfc4a15291dc5a5d41 to before 75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5edAffected
  • cf68fffb66d60d96209446bfc4a15291dc5a5d41 to before ca3897f2ac02ceae5e6fa794f83c36f9885b93daAffected
  • cf68fffb66d60d96209446bfc4a15291dc5a5d41 to before 57cd6d157eb479f0a8e820fd36b7240845c8a937Affected
LinuxLinux
  • 5.13Affected
  • before 5.13Not affected
  • 5.15.49 through 5.15.*Not affected
  • 5.18.6 through 5.18.*Not affected
  • 5.19 and laterNot affected

References

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