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CVE

CVE-2026-64106

KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
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CVE

CVE-2026-64106

KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: vgic-its: Reject restored DTE with out-of-range numeventidbits

Userspace can restore an ITS Device Table Entry whose Size field encodes

more EventID bits than the virtual ITS supports.  The live MAPD path

rejects that state, but vgicitsrestore_dte() accepts it and stores the

out-of-range value in dev->numeventidbits.

Reject restored DTEs with numeventidbits > VITSTYPERIDBITS before

allocating the device.  This mirrors the MAPD check and prevents the

restored state from reaching vgicitsrestore_itt(), where the unchecked

value can be converted into an oversized scanitstable() range.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/0680f511926589206f81f57f76ce131d7741a316, https://git.kernel.org/stable/c/1716b7fea2ead941a0dfac06c4504a3437cdf00d, https://git.kernel.org/stable/c/8bcd15b690a390241179516af1b6ae49ebfd9d95, https://git.kernel.org/stable/c/9ce754ed8e7ab4e3999767ce1505f85c449ccb07, https://git.kernel.org/stable/c/b94538186a3eae3763b8f96dacd610920a865aa7, https://git.kernel.org/stable/c/dab9f93251b2c86a033de6098d0c73afddd55d4a, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64106.json, https://nvd.nist.gov/vuln/detail/CVE-2026-64106, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9

CVSS Score
0
10

Basic Information

Base CVSS
9
EPSS Probability
0.00148%
EPSS Percentile
0.04317%
Introduced Version
57a9a117154c93539e33161dd318e6aeb8c04efa,4.12.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
9ce754ed8e7ab4e3999767ce1505f85c449ccb07,6.1.175,6.6.142,6.12.92,6.18.34,7.0.11,6.1.176-1,6.12.94-1,7.0.0-28.28~24.04.1,7.0.0-1016.16~24.04.1,7.0.0-28.28.1~24.04.3,1:6.18.35-68.127.amzn2023,1:1.0-0.amzn2023,1:6.1.175-219.357.amzn2023,1:6.12.92-122.166.amzn2023

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