NULL Pointer Dereference Affecting kernel-zfcpdump-core package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL10-KERNELZFCPDUMPCORE-21682815
- published24 Oct 2026
- disclosed18 Oct 2026
Introduced: 18 Oct 2026
NewCVE-2026-98841 (opens in a new tab)How to fix?
There is no fixed version for RHEL:10 kernel-zfcpdump-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-zfcpdump-core package and not the kernel-zfcpdump-core package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
virt: vmgenid: set driver_data before registering notification handlers
Both probe paths register their notification handler before assigning driver_data, which the handler dereferences.
In the devicetree path, the notification IRQ can fire as soon as devm_request_irq() registers the handler: the interrupt may already be pending at probe time, for example when a VMM injects the generation-changed notification while restoring a guest from a snapshot that was taken before the driver had probed (Firecracker does exactly this on snapshot restore). The IRQ is also requested with IRQF_SHARED, so another device sharing the line can trigger the handler just as early. The handler then calls vmgenid_notify(), which dereferences the still-NULL driver_data and panics:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.38+ #1 PREEMPT(none) Hardware name: linux,dummy-virt (DT) pc : vmgenid_notify.isra.0+0x24/0x8c lr : vmgenid_of_irq_handler+0x14/0x34 Call trace: vmgenid_notify.isra.0+0x24/0x8c (P) vmgenid_of_irq_handler+0x14/0x34 __handle_irq_event_percpu+0x44/0x1bc handle_irq_event+0x4c/0xb4 handle_fasteoi_irq+0xf8/0x1f8
The ACPI path has the same ordering problem: the handler is installed with acpi_install_notify_handler() before driver_data is assigned. ACPI notifications are dispatched asynchronously from a workqueue, so the window is narrow, but a notification arriving between the two calls hits the same NULL dereference.
Assign driver_data before registering the handlers. The state is fully initialized at that point, so the handlers are safe to run. Should registration fail, the probe error path leaves no dangling pointer behind: the driver core clears driver_data in device_unbind_cleanup().
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2555257
- https://access.redhat.com/security/cve/CVE-2026-98841
- https://git.kernel.org/stable/c/538fe5efaa9704ad820ba34b4f9df135ca873d79
- https://git.kernel.org/stable/c/7a1e8daeaa466c6aaffa223e1afe9cfeece0dd47
- https://git.kernel.org/stable/c/8f42954ad8bf9bdbf574f2c437ad30cb2601f401
- https://git.kernel.org/stable/c/9f8139c6145cf17d690d6c414d43b4c0bef632fb