Is CVE-2026-98395 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-98395 being exploited in the wild.

How severe is CVE-2026-98395?

Informational severity, published 14 October 2026.

Which products and versions are affected?

Linux kernel versions prior to fix (CVE-2026-98395).

Is there a fix for CVE-2026-98395?

Yes: fixed in Linux kernel versions with commit fixing arch_interrupt_async_exit_prepare() to use hard_irq_disable(). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-98395 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-98395?

Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-98395: Linux kernel powerpc irq_soft_mask corruption on interrupt replay

CVE-2026-98395 · Severity: info · Published 2026-10-14

A bug in the Linux kernel's PowerPC interrupt handling corrupts the soft interrupt mask during replayed interrupts, causing warnings during boot on POWER10 systems. While this appears to be a low-severity defect that primarily manifests as boot-time warnings rather than a security vulnerability, it can lead to incorrect interrupt state management that could potentially be exploited.

Technologies: Linux kernel.

Quick answers

Is CVE-2026-98395 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-98395 being exploited in the wild.
How severe is CVE-2026-98395?: Informational severity, published 14 October 2026.
Which products and versions are affected?: Linux kernel versions prior to fix (CVE-2026-98395).
Is there a fix for CVE-2026-98395?: Yes: fixed in Linux kernel versions with commit fixing arch_interrupt_async_exit_prepare() to use hard_irq_disable(). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-98395 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-98395?: Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Linux kernel versions with commit fixing arch_interrupt_async_exit_prepare() to use hard_irq_disable()

Technical details

The vulnerability exists in __replay_soft_interrupts() where the handler's exit path calls arch_interrupt_async_exit_prepare(), which unconditionally sets irq_soft_mask to IRQS_DISABLED (0x1), stripping the IRQS_PMI_DISABLED (0x2) bit. Since replayed interrupts bypass the normal arch_interrupt_enter_prepare() entry point, the mask remains corrupted at 0x1 instead of IRQS_ALL_DISABLED (0x3), triggering WARN_ON checks in next_interrupt(). The fix replaces local_irq_disable() with hard_irq_disable() to properly preserve the full soft mask state on PPC64 and correctly disable interrupts on PPC32.

Affected products

Linux Kernel versions prior to fix (CVE-2026-98395)

Timeline

2026-10-14: disclosed

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