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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 001c78bc64389cabe4f9015ab3942ec9c3592caa, 0e79ebf6f92a7d15187aede44204fa04b93e474c, 3.17; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.

Low priority for now. Upgrade to Linux Linux 001c78bc64389cabe4f9015ab3942ec9c3592caa, 0e79ebf6f92a7d15187aede44204fa04b93e474c, 3.17; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • f54d0bb8487d2f016fbc4f0e38ef9098f8eb8bd4, 89be8950bab799ddb9cc3777345e3c21bcb32dba, 4.16affected
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 001c78bc64389cabe4f9015ab3942ec9c3592caaaffected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 552a110c403f1a61eba0bf71519c6585d9d4242daffected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 0e79ebf6f92a7d15187aede44204fa04b93e474caffected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 84da7a0e92207444d9cbfe69965e17db29008f27affected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 74836ae4785b9754bb36d0b18fcc1dec4e5e98d2affected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 318ef696fa3c712e46bb62a1a828c3cd62f390c3affected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 55865b3ae03705aa39198783b9cb1f8b96eb44e4affected · git
    • b2ac58f90540e39324e7a29a7ad471407ae0bf48 and later · before 9e06bbb9ade7cdf28d4a3b5b14e5812881c8df85affected · git
    • 3.16.57 and later · before 3.17affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98714Oct 18, 2026 · KVM: SVM: Update control fields on #VMEXIT if and only if VMRUN succeeded
    0Monitor
  • ← EarlierCVE-2026-98715Oct 18, 2026 · KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN
    0Monitor
  • Later →CVE-2026-98717Oct 18, 2026 · KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux001c78bc64389cabe4f9015ab3942ec9c3592caaVendor (CNA)
Linux Linux0e79ebf6f92a7d15187aede44204fa04b93e474cVendor (CNA)
Linux Linux3.17Vendor (CNA)
Linux Linux318ef696fa3c712e46bb62a1a828c3cd62f390c3Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux552a110c403f1a61eba0bf71519c6585d9d4242dVendor (CNA)
Linux Linux55865b3ae03705aa39198783b9cb1f8b96eb44e4Vendor (CNA)
Linux Linux74836ae4785b9754bb36d0b18fcc1dec4e5e98d2Vendor (CNA)
Linux Linux84da7a0e92207444d9cbfe69965e17db29008f27Vendor (CNA)
Linux Linux9e06bbb9ade7cdf28d4a3b5b14e5812881c8df85Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 7, 2026+20 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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