KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.113, 6.18.51, 7.2.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From eff484e0298da5a4d18ca82f5454c557fd942af5 · fixed in dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e; From eff484e0298da5a4d18ca82f5454c557fd942af5 · fixed in 2c3a87ad3d3935c43d465cd2465db9020f9e898f; From eff484e0298da5a4d18ca82f5454c557fd942af5 · fixed in 3d4c26b16a04a084fe0bde08ccdd8086570f8bbe; From eff484e0298da5a4d18ca82f5454c557fd942af5 · fixed in 36df368861d2664291298feeb37dfef43fcae670; From eff484e0298da5a4d18ca82f5454c557fd942af5 · fixed in c6c156d931c33b92362383cf76f6d6e1291dcbfe
- Linux Linux
4.12
- KernelLinux
From 4.12.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5