CVE-2026-89912

KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save

State: Published
Severity: 7.1 High
Published: Sep 16, 2026
Updated: Oct 30, 2026
Reserved: Sep 11, 2026

Description

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

KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save

MAPC with V=0 drops ite->collection but leaves the ITE on the device's ITT list, and vgic_its_save_ite() dereferences it unconditionally. A guest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the host when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it. That sequence is UNPREDICTABLE per the architecture, but KVM already handles the resulting state in the translate, MOVI and DISCARD paths.

Save a zeroed entry, which vgic_its_restore_ite() reads back as invalid. Skipping the ITE instead would leave the ITT slot holding whatever is in guest memory, and restore rejects an entry naming a collection the restored collection table does not have.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	eff484e0298da5a4d18ca82f5454c557fd942af5 to before df829e4fe235b3a0dbf830986d81c040d3d2e940Affected eff484e0298da5a4d18ca82f5454c557fd942af5 to before 0fb71211146e39cf67811ccb873d2770a9c129acAffected eff484e0298da5a4d18ca82f5454c557fd942af5 to before 566d0f99aec92280ce403f22068eb07241a79e2aAffected eff484e0298da5a4d18ca82f5454c557fd942af5 to before dd0c3e6c03e3bb3fd7c0fa422230020674c5c25eAffected eff484e0298da5a4d18ca82f5454c557fd942af5 to before 2c3a87ad3d3935c43d465cd2465db9020f9e898fAffected eff484e0298da5a4d18ca82f5454c557fd942af5 to before 3d4c26b16a04a084fe0bde08ccdd8086570f8bbeAffected eff484e0298da5a4d18ca82f5454c557fd942af5 to before 36df368861d2664291298feeb37dfef43fcae670Affected eff484e0298da5a4d18ca82f5454c557fd942af5 to before c6c156d931c33b92362383cf76f6d6e1291dcbfeAffected
LinuxLinux	4.12Affected before 4.12Not affected 5.10.273 through 5.10.Not affected 5.15.224 through 5.15.Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.113 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

eff484e0298da5a4d18ca82f5454c557fd942af5 to before df829e4fe235b3a0dbf830986d81c040d3d2e940Affected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before 0fb71211146e39cf67811ccb873d2770a9c129acAffected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before 566d0f99aec92280ce403f22068eb07241a79e2aAffected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before dd0c3e6c03e3bb3fd7c0fa422230020674c5c25eAffected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before 2c3a87ad3d3935c43d465cd2465db9020f9e898fAffected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before 3d4c26b16a04a084fe0bde08ccdd8086570f8bbeAffected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before 36df368861d2664291298feeb37dfef43fcae670Affected
eff484e0298da5a4d18ca82f5454c557fd942af5 to before c6c156d931c33b92362383cf76f6d6e1291dcbfeAffected

LinuxLinux

4.12Affected
before 4.12Not affected
5.10.273 through 5.10.*Not affected
5.15.224 through 5.15.*Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.113 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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