CVE - CVE-2023-52597

CVE-ID
CVE-2023-52597	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0671f42a9c1084db10d68ac347d08dbf6689ecb3 URL:https://git.kernel.org/stable/c/0671f42a9c1084db10d68ac347d08dbf6689ecb3 MISC:https://git.kernel.org/stable/c/150a3a3871490e8c454ffbac2e60abeafcecff99 URL:https://git.kernel.org/stable/c/150a3a3871490e8c454ffbac2e60abeafcecff99 MISC:https://git.kernel.org/stable/c/2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7 URL:https://git.kernel.org/stable/c/2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7 MISC:https://git.kernel.org/stable/c/3a04410b0bc7e056e0843ac598825dd359246d18 URL:https://git.kernel.org/stable/c/3a04410b0bc7e056e0843ac598825dd359246d18 MISC:https://git.kernel.org/stable/c/5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1 URL:https://git.kernel.org/stable/c/5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1 MISC:https://git.kernel.org/stable/c/732a3bea7aba5b15026ea42d14953c3425cc7dc2 URL:https://git.kernel.org/stable/c/732a3bea7aba5b15026ea42d14953c3425cc7dc2 MISC:https://git.kernel.org/stable/c/b988b1bb0053c0dcd26187d29ef07566a565cf55 URL:https://git.kernel.org/stable/c/b988b1bb0053c0dcd26187d29ef07566a565cf55 MISC:https://git.kernel.org/stable/c/c87d7d910775a025e230fd6359b60627e392460f URL:https://git.kernel.org/stable/c/c87d7d910775a025e230fd6359b60627e392460f
Assigning CNA
kernel.org
Date Record Created
20240302	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240302)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)