CVE - CVE-2024-50115

CVE-ID
CVE-2024-50115	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: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory Ignore nCR3[4:0] when loading PDPTEs from memory for nested SVM, as bits 4:0 of CR3 are ignored when PAE paging is used, and thus VMRUN doesn't enforce 32-byte alignment of nCR3. In the absolute worst case scenario, failure to ignore bits 4:0 can result in an out-of-bounds read, e.g. if the target page is at the end of a memslot, and the VMM isn't using guard pages. Per the APM: The CR3 register points to the base address of the page-directory-pointer table. The page-directory-pointer table is aligned on a 32-byte boundary, with the low 5 address bits 4:0 assumed to be 0. And the SDM's much more explicit: 4:0 Ignored Note, KVM gets this right when loading PDPTRs, it's only the nSVM flow that is broken.
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/2c4adc9b192a0815fe58a62bc0709449416cc884 URL:https://git.kernel.org/stable/c/2c4adc9b192a0815fe58a62bc0709449416cc884 MISC:https://git.kernel.org/stable/c/426682afec71ea3f889b972d038238807b9443e4 URL:https://git.kernel.org/stable/c/426682afec71ea3f889b972d038238807b9443e4 MISC:https://git.kernel.org/stable/c/58cb697d80e669c56197f703e188867c8c54c494 URL:https://git.kernel.org/stable/c/58cb697d80e669c56197f703e188867c8c54c494 MISC:https://git.kernel.org/stable/c/6876793907cbe19d42e9edc8c3315a21e06c32ae URL:https://git.kernel.org/stable/c/6876793907cbe19d42e9edc8c3315a21e06c32ae MISC:https://git.kernel.org/stable/c/f559b2e9c5c5308850544ab59396b7d53cfc67bd URL:https://git.kernel.org/stable/c/f559b2e9c5c5308850544ab59396b7d53cfc67bd
Assigning CNA
kernel.org
Date Record Created
20241021	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 (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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