KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails (CVE-2026-72283) | HOL Guard CVE

High · CVSS 8.8CVE-2026-72283

KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails

Answer in brief

CVE-2026-72283 records a High severity (CVSS 8.8) vulnerability in KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=77e1b8332d1d7aa786f7515e9bd4055def6a1e06 <d1379888cc4230bac647ec24ab83306afbd03e88 \|\| >=77e1b8332d1d7aa786f7515e9bd4055def6a1e06 <d5560b6569cd05ba72c6b33427fbabc6ec46b8cf \|\| >=77e1b8332d1d7aa786f7515e9bd4055def6a1e06 <ed446e8aa894883c08892cfee69782fdf8f6c3ca	d1379888cc4230bac647ec24ab83306afbd03e88, d5560b6569cd05ba72c6b33427fbabc6ec46b8cf, ed446e8aa894883c08892cfee69782fdf8f6c3ca
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to d1379888cc4230bac647ec24ab83306afbd03e88 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails Nullify irqfd->producer if updating the IRTE for bypass fails, as leaving a dangling pointer will result in a use-after-free if the irqfd is reachable through KVM's routing, but the producer is freed separately. E.g. for VFIO PCI, the producer is embedded in struct "vfio_pci_irq_ctx" and freed when the vector is disabled, which can happen independent of routing updates. [sean: drop PPC change, massage changelog]

Quoted source text, attributed separately from HOL analysis.