CVE-2024-50115

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Source
https://cve.org/CVERecord?id=CVE-2024-50115
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-50115.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-50115
Downstream
Related
Published
2024-11-05T17:10:46.677Z
Modified
2026-03-12T02:18:19.745368Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50115.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
e4e517b4be019787ada4cbbce2f04570c21b0cbd
Fixed
76ce386feb14ec9a460784fcd495d8432acce7a5
Fixed
58cb697d80e669c56197f703e188867c8c54c494
Fixed
6876793907cbe19d42e9edc8c3315a21e06c32ae
Fixed
2c4adc9b192a0815fe58a62bc0709449416cc884
Fixed
426682afec71ea3f889b972d038238807b9443e4
Fixed
f559b2e9c5c5308850544ab59396b7d53cfc67bd

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-50115.json"