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 | Score | |
---|---|---|
CVSS Version 2.x | 0 | |
CVSS Version 3.x | HIGH | 7.1 |
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 |