CVE-2023-52740 powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch
A race condition in the Linux kernel powerpc interrupt exit code can corrupt MSR state, leading to system crashes and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52740?
CVE-2023-52740 is a medium-severity vulnerability in Linux kernel, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch
The RFI and STF security mitigation options can flip the interrupt_exit_not_reentrant static branch condition concurrently with the interrupt exit code which tests that branch.
Interrupt exit tests this condition to set MSR[EE|RI] for exit, then again in the case a soft-masked interrupt is found pending, to recover the MSR so the interrupt can be replayed before attempting to exit again. If the condition changes between these two tests, the MSR and irq soft-mask state will become corrupted, leading to warnings and possible crashes. For example, if the branch is initially true then false, MSR[EE] will be 0 but PACA_IRQ_HARD_DIS clear and EE may not get enabled, leading to warnings in irq_64.c.
Weakness: CWE-362
Which versions are affected by CVE-2023-52740?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52740?
Apply the vendor's patch.
Is CVE-2023-52740 being exploited?
There is no known exploitation of CVE-2023-52740 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52740, DEBIAN-CVE-2023-52740, GHSA-qgwv-qgmf-mmf4, UBUNTU-CVE-2023-52740.