KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save
CVE-2026-89912 · published 16 Sept 2026
How serious is it
- Severity: high, CVSS score 7.1 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-89912?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: eff484e0298da5a4d18ca82f5454c557fd942af5 to < dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e, eff484e0298da5a4d18ca82f5454c557fd942af5 to < 2c3a87ad3d3935c43d465cd2465db9020f9e898f, eff484e0298da5a4d18ca82f5454c557fd942af5 to < 3d4c26b16a04a084fe0bde08ccdd8086570f8bbe, eff484e0298da5a4d18ca82f5454c557fd942af5 to < 36df368861d2664291298feeb37dfef43fcae670
- Linux Linux: 4.12
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e
- git.kernel.org/stable/c/2c3a87ad3d3935c43d465cd2465db9020f9e898f
- git.kernel.org/stable/c/3d4c26b16a04a084fe0bde08ccdd8086570f8bbe
- git.kernel.org/stable/c/36df368861d2664291298feeb37dfef43fcae670
- git.kernel.org/stable/c/c6c156d931c33b92362383cf76f6d6e1291dcbfe
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON