In the Linux kernel, the following vulnerability has been resolved: KVM: s390: fix setting of fpc register kvm_arch_vcpu_ioctl_set_fpu() allows to set the floating point control (fpc) register of a guest cpu. The new value is tested for validity by temporarily loading it into the fpc register. This may lead to corruption of the fpc register of the host process: if an interrupt happens while the value is temporarily loaded into the fpc register, and within interrupt context floating point or vector registers are used, the current fp/vx registers are saved with save_fpu_regs() assuming they belong to user space and will be loaded into fp/vx registers when returning to user space. test_fp_ctl() restores the original user space / host process fpc register value, however it will be discarded, when returning to user space. In result the host process will incorrectly continue to run with the value that was supposed to be used for a guest cpu. Fix this by simply removing the test. There is another test right before the SIE context is entered which will handles invalid values. This results in a change of behaviour: invalid values will now be accepted instead of that the ioctl fails with -EINVAL. This seems to be acceptable, given that this interface is most likely not used anymore, and this is in addition the same behaviour implemented with the memory mapped interface (replace invalid values with zero) - see sync_regs() in kvm-s390.c.
History

Mon, 04 Nov 2024 13:45:00 +0000

Type Values Removed Values Added
References

Mon, 04 Nov 2024 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-03-06T06:45:26.608Z

Updated: 2024-11-07T17:29:59.971Z

Reserved: 2024-03-02T21:55:42.572Z

Link: CVE-2023-52597

cve-icon Vulnrichment

Updated: 2024-08-02T23:03:21.131Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-03-06T07:15:09.827

Modified: 2024-11-07T18:35:05.660

Link: CVE-2023-52597

cve-icon Redhat

Severity : Low

Publid Date: 2024-03-06T00:00:00Z

Links: CVE-2023-52597 - Bugzilla