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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= eff484e0298da5a4d18ca82f5454c557fd942af5, < df829e4fe235b3a0dbf830986d81c040d3d2e940; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < 0fb71211146e39cf67811ccb873d2770a9c129ac; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < 566d0f99aec92280ce403f22068eb07241a79e2a; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < 2c3a87ad3d3935c43d465cd2465db9020f9e898f; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < 3d4c26b16a04a084fe0bde08ccdd8086570f8bbe; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < 36df368861d2664291298feeb37dfef43fcae670; >= eff484e0298da5a4d18ca82f5454c557fd942af5, < c6c156d931c33b92362383cf76f6d6e1291dcbfe |
| Linux | Linux | 4.12 |
References
- https://git.kernel.org/stable/c/0fb71211146e39cf67811ccb873d2770a9c129ac
- https://git.kernel.org/stable/c/2c3a87ad3d3935c43d465cd2465db9020f9e898f
- https://git.kernel.org/stable/c/36df368861d2664291298feeb37dfef43fcae670
- https://git.kernel.org/stable/c/3d4c26b16a04a084fe0bde08ccdd8086570f8bbe
- https://git.kernel.org/stable/c/566d0f99aec92280ce403f22068eb07241a79e2a
- https://git.kernel.org/stable/c/c6c156d931c33b92362383cf76f6d6e1291dcbfe
- https://git.kernel.org/stable/c/dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e
- https://git.kernel.org/stable/c/df829e4fe235b3a0dbf830986d81c040d3d2e940
Timeline
- Published
- Sep 16, 2026
- Last modified
- Oct 30, 2026
- NVD status
- Received