high
7.1
CWE
125
Advisory Published
Updated

CVE-2024-50115: KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory

First published: Tue Nov 05 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Kernel>=3.2<5.10.229
Linux Kernel>=5.11<5.15.170
Linux Kernel>=5.16<6.1.115
Linux Kernel>=6.2<6.6.59
Linux Kernel>=6.7<6.11.6
Linux Kernel=6.12-rc1
Linux Kernel=6.12-rc2
Linux Kernel=6.12-rc3
Linux Kernel=6.12-rc4
debian/linux<=5.10.223-1
5.10.234-1
6.1.129-1
6.1.133-1
6.12.22-1
debian/linux-6.1
6.1.129-1~deb11u1

Remedy

https://git.kernel.org/stable/c/2c4adc9b192a0815fe58a62bc0709449416cc884

Remedy

https://git.kernel.org/stable/c/426682afec71ea3f889b972d038238807b9443e4

Remedy

https://git.kernel.org/stable/c/58cb697d80e669c56197f703e188867c8c54c494

Remedy

https://git.kernel.org/stable/c/6876793907cbe19d42e9edc8c3315a21e06c32ae

Remedy

https://git.kernel.org/stable/c/76ce386feb14ec9a460784fcd495d8432acce7a5

Remedy

https://git.kernel.org/stable/c/f559b2e9c5c5308850544ab59396b7d53cfc67bd

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-50115?

    The severity of CVE-2024-50115 is classified as high due to potential impacts on nested virtual machine environments.

  • How do I fix CVE-2024-50115?

    To fix CVE-2024-50115, update the Linux kernel to the latest version that resolves this vulnerability.

  • Which versions of the Linux kernel are affected by CVE-2024-50115?

    CVE-2024-50115 affects multiple versions of the Linux kernel from 3.2 up to 6.12-rc4.

  • Can CVE-2024-50115 affect my virtual machines?

    Yes, CVE-2024-50115 can potentially impact the security and stability of nested virtual machines.

  • Is there a workaround for CVE-2024-50115?

    Currently, the recommended action for CVE-2024-50115 is to apply the latest kernel updates, as there are no secure workarounds available.

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