Bug 2555054 (CVE-2026-98712) - CVE-2026-98712 kernel: KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq
Summary: CVE-2026-98712 kernel: KVM: arm64: vgic: Take a refcount on IRQs referenced b...
Keywords:
Status: NEW
Alias: CVE-2026-98712
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-18 15:51 UTC by OSIDB Bzimport
Modified: 2026-10-22 10:45 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-18 15:51:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq

Referencing the last interrupt inserted in an LR is rather fragile, as
this interrupt can vanish if a concurrently unmapped LPI.

Solve this by bumping up the refcount on the interrupt when populating
last_lr_irq, and drop it at vgic_prune_ap_list() time, when LPIs are
being reclaimed.
Comment 1 Mauro Matteo Cascella 2026-10-22 10:37:31 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98712.mbox
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