Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e4e517b4be019787ada4cbbce2f04570c21b0cbd before 76ce386feb14ec9a460784fcd495d8432acce7a5; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd before 58cb697d80e669c56197f703e188867c8c54c494; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd before 6876793907cbe19d42e9edc8c3315a21e06c32ae; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd before 2c4adc9b192a0815fe58a62bc0709449416cc884; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd before 426682afec71ea3f889b972d038238807b9443e4; affected e4e517b4be019787ada4cbbce2f04570c21b0cbd before f559b2e9c5c5308850544ab59396b7d53cfc67bd |
| Linux / Linux | affected 3.2; unaffected 0 before 3.2; unaffected 5.10.229 through 5.10.*; unaffected 5.15.170 through 5.15.*; unaffected 6.1.115 through 6.1.*; unaffected 6.6.59 through 6.6.*; unaffected 6.11.6 through 6.11.*; unaffected 6.12 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/76ce386feb14ec9a460784fcd495d8432acce7a5
- https://git.kernel.org/stable/c/58cb697d80e669c56197f703e188867c8c54c494
- https://git.kernel.org/stable/c/6876793907cbe19d42e9edc8c3315a21e06c32ae
- https://git.kernel.org/stable/c/2c4adc9b192a0815fe58a62bc0709449416cc884
- https://git.kernel.org/stable/c/426682afec71ea3f889b972d038238807b9443e4
- https://git.kernel.org/stable/c/f559b2e9c5c5308850544ab59396b7d53cfc67bd
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.