VulnerabilityPublished 23 Oct 2026

CVE-2026-98923: Linux kernel · arm64: io: Reject non-user protection in ioremap_prot()

Source GCVE Database

Authoritative record:CVE-2026-98923

Not known to be exploited · fixed in fddc90d4af4550af410f52d11bbf6b5f36443838 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Low

Rated by Threat Radar · 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-q3vh-mmhj-mxhr

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.6.143 <6.6.158 >=6.12.93 <6.12.112 >=6.18.17 <6.18.55 >=6.19.7 <6.20	Fixed in fddc90d4af4550af410f52d11bbf6b5f36443838 bb756b11ad63832ebee58caf9e8f9381eaecff9f b17aa4955e3a694c663ebe99626e4c76ca4f7cfb 9b583795feb51f8d50203228d001760d1344ef01 6.20 6.18.55 6.12.112 6.6.158 0b04af3d88bb7fc69b2d92457890608860e42365
LinuxLinux	Affected =7.0	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to reject protection values without PTE_USER in ioremap_prot(), eliminating the spurious warnings and properly handling PROT_NONE and execute-only mappings. Users should update to the fixed kernel version once available. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel arm64 io subsystem related to ioremap_prot() was resolved. The issue involved improper handling of non-user protection flags in memory mappings, causing spurious warnings when reading process cmdline via /proc. The fix ensures ioremap_prot() rejects protection values without PTE_USER, preventing invalid warnings and cleanly failing access for PROT_NONE and execute-only mappings.

References

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