# CVE-2026-98923: Linux kernel ARM64 spurious warning in ioremap_prot

Source: https://junglewise.ai/threats/cve-2026-98923-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-98923 · Severity: info · Published 2026-10-23

The Linux kernel's ARM64 architecture code was generating invalid warning messages when legitimate user memory mappings with PROT_NONE or execute-only protections were accessed through /proc interfaces. The spurious warnings could alarm system administrators or trigger unwanted monitoring alerts, even though the operations themselves were valid and not a security issue.

Technologies: [Linux kernel](https://junglewise.ai/threats/technologies/x-linux-kernel).

## Quick answers

**Is CVE-2026-98923 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-98923 being exploited in the wild.

**How severe is CVE-2026-98923?** Informational severity, published 23 October 2026.

**Which products and versions are affected?** Linux kernel Multiple versions prior to fix commit bb756b11ad63832ebee58caf9e8f9381eaecff9f.

**Is there a fix for CVE-2026-98923?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-98923 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-98923?** 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.

## Technical details

A spurious WARN_ON_ONCE() fires in ioremap_prot() when generic_access_phys() passes user page table entries with PROT_NONE or execute-only protections that lack the PTE_USER bit set. The fix changes the warning to a silent rejection, preventing the warning while maintaining the user-protection contract by cleanly failing such accesses.

## Affected products

- Linux kernel Multiple versions prior to fix commit bb756b11ad63832ebee58caf9e8f9381eaecff9f

## Timeline

- 2026-10-23: disclosed

## References

- [https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365](https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365)
- [https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01](https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01)

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