CVE-2026-98923: Linux kernel · arm64: io: Reject non-user protection in ioremap_prot()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 02:28 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this vulnerability has been implemented in the Linux kernel to reject protection values without the PTE_USER flag in ioremap_prot() without triggering warnings. Users should apply the updated kernel versions that include this fix. No additional mitigation actions are required beyond updating to a fixed kernel release.
Description
CVE-2026-98923 is a vulnerability in the Linux kernel's arm64 architecture io subsystem. It involves improper handling of non-user protection flags in the ioremap_prot() function, which causes spurious warnings when mapping certain memory pages with PROT_NONE or execute-only permissions. The issue arises because PROT_NONE mappings are represented by present-invalid page table entries that lack the PTE_USER flag, triggering warnings despite being valid user mappings. The fix ensures ioremap_prot() rejects protection values without PTE_USER without warning, preventing these spurious warnings and enforcing correct user-protection contracts.
References
- ubuntu.com/security/CVE-2026-98923 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98923 (opens in a new tab)
- git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365 (opens in a new tab)
- git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01 (opens in a new tab)
- git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb (opens in a new tab)
- git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f (opens in a new tab)
- git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838 (opens in a new tab)