Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected eff484e0298da5a4d18ca82f5454c557fd942af5 before dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e; affected eff484e0298da5a4d18ca82f5454c557fd942af5 before 2c3a87ad3d3935c43d465cd2465db9020f9e898f; affected eff484e0298da5a4d18ca82f5454c557fd942af5 before 3d4c26b16a04a084fe0bde08ccdd8086570f8bbe; affected eff484e0298da5a4d18ca82f5454c557fd942af5 before 36df368861d2664291298feeb37dfef43fcae670; affected eff484e0298da5a4d18ca82f5454c557fd942af5 before c6c156d931c33b92362383cf76f6d6e1291dcbfe |
| Linux / Linux | affected 4.12; unaffected 0 before 4.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e
- https://git.kernel.org/stable/c/2c3a87ad3d3935c43d465cd2465db9020f9e898f
- https://git.kernel.org/stable/c/3d4c26b16a04a084fe0bde08ccdd8086570f8bbe
- https://git.kernel.org/stable/c/36df368861d2664291298feeb37dfef43fcae670
- https://git.kernel.org/stable/c/c6c156d931c33b92362383cf76f6d6e1291dcbfe
ADP enrichment
No English description supplied.
No references supplied.