01 Record

CVE-2026-64247

KVM: x86: hyper-v: Bound the bank index when querying sparse banks

HighPUBLISHEDCNA: Linux

CNA base score8.4 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H

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02 Description

KVM: x86: hyper-v: Bound the bank index when querying sparse banks

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 4.5% of scored records. A rank, not a probability.

NVD base score

8.4 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-07-24 15:31Z3 MO AGO

Last updated

2026-10-19 20:28Z9 DAYS AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.4)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H

Weaknesses

CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

c2187b6c48d8e510b6433d939441e8056b4f9d9865d1443566732bdc7f6d9497

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxc58a318f6090efe06e6702b8882e2026f44f620e to < d18756b12aab30d07794446445c93112e5c69a2e, c58a318f6090efe06e6702b8882e2026f44f620e to < 83c2f52c6a78b1590034e955cff3fe0b052fe4ae, c58a318f6090efe06e6702b8882e2026f44f620e to < e36095d8d922bb26ce860231aacf0cd14edea07c, c58a318f6090efe06e6702b8882e2026f44f620e to < f636cf6a1e7b7f40d48d8d08bd5f152aa61dd130, c58a318f6090efe06e6702b8882e2026f44f620e to < 4721f8160f17554b003e8928bb61e6c9b2fe92a3, 6.2—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/d18756b12aab30d07794446445c93112e5c69a2e
git.kernel.orghttps://git.kernel.org/stable/c/83c2f52c6a78b1590034e955cff3fe0b052fe4ae
git.kernel.orghttps://git.kernel.org/stable/c/e36095d8d922bb26ce860231aacf0cd14edea07c
git.kernel.orghttps://git.kernel.org/stable/c/f636cf6a1e7b7f40d48d8d08bd5f152aa61dd130
git.kernel.orghttps://git.kernel.org/stable/c/4721f8160f17554b003e8928bb61e6c9b2fe92a3

07 Fixed in

Debian 13

linux
Fixed in 6.12.95-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 7.1.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.