CVE-2024-50115

Updated: 2024-12-19 11:39:08.449495

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.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x 0
CVSS Version 3.x HIGH 7.1

Status

OS name Project name Version Score Severity Status Errata Last updated

Statement

AlmaLinux 9.2 ESU kernel 5.14.0 7.1 HIGH Released CLSA-2025:1738671431 2025-02-05 02:21:09
AlmaLinux 9.2 FIPS kernel 5.14.0 7.1 HIGH Released CLSA-2025:1738670922 2025-02-05 02:21:07
CentOS 7 ELS kernel 3.10.0 7.1 HIGH Released CLSA-2025:1737468474 2025-02-04 02:17:41
CentOS 8.4 ELS kernel 4.18.0 7.1 HIGH In Testing CLSA-2025:1736778412 2025-02-01 23:54:42
CentOS 8.5 ELS kernel 4.18.0 7.1 HIGH In Testing CLSA-2025:1736778632 2025-02-11 00:36:39
CentOS Stream 8 ELS kernel 4.18.0 7.1 HIGH In Testing CLSA-2025:1736783731 2025-02-01 23:54:41
CloudLinux 7 ELS kernel 3.10.0 7.1 HIGH Ignored 2025-01-11 02:41:13
Oracle Linux 7 ELS kernel 3.10.0 7.1 HIGH Needs Triage 2024-12-19 11:54:52
Ubuntu 16.04 ELS linux 4.4.0 7.1 HIGH Released CLSA-2025:1736470237 2025-02-07 06:39:53
Ubuntu 16.04 ELS linux-hwe 4.15.0 7.1 HIGH Released CLSA-2025:1736444557 2025-02-07 06:39:54
Total: 11