CVE-2026-98923: Linux kernel · arm64: io: Reject non-user protection in ioremap_prot()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fddc90d4af4550af410f52d11bbf6b5f36443838 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 16:00 UTC
Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in fddc90d4af4550af410f52d11bbf6b5f36443838, bb756b11ad63832ebee58caf9e8f9381eaecff9f, b17aa4955e3a694c663ebe99626e4c76ca4f7cfb +6
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
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
Fixed versions are available and should be applied. The vulnerability is resolved in Linux kernel versions 6.6.158, 6.12.112, 6.18.55, 6.20, and 7.0. Users should upgrade to these or later versions to remediate the issue. No additional mitigation is required as the patch cleanly rejects invalid protection flags without warnings.
Description
A vulnerability in the Linux kernel's arm64 architecture io subsystem was fixed to prevent improper handling of non-user protection flags in ioremap_prot(). This flaw caused spurious warnings when mapping certain memory pages with PROT_NONE or execute-only protections, due to incorrect interpretation of page table entries. The fix ensures ioremap_prot() rejects protection values lacking PTE_USER without warning, preventing invalid access attempts.
References
- git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838 (opens in a new tab)
- git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365 (opens in a new tab)
- git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb (opens in a new tab)
- git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01 (opens in a new tab)
- git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f (opens in a new tab)