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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 0b04af3d88bb7fc69b2d92457890608860e42365, 6.12.112, 6.18.55.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0b04af3d88bb7fc69b2d92457890608860e42365, 6.12.112, 6.18.55 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: arm64: io: Reject non-user protection in ioremap_prot() Mapping a stack-top page via /dev/mem with PROT_NONE and then reading that process's /proc/<pid>/cmdline triggers a spurious WARN in ioremap_prot() through generic_access_phys(): WARNING: ./arch/arm64/include/asm/io.h:275 at generic_access_phys Call trace: generic_access_phys+0x1c8/0x228 (P) __access_remote_vm+0x2b4/0x398 access_remote_vm+0x14/0x30 get_mm_cmdline+0xf8/0x2a0 proc_pid_cmdline_read+0x68/0x120 generic_access_phys() passes the protection derived from the user PTE to ioremap_prot(). On arm64, a PROT_NONE mapping is represented by a present-invalid PTE, so pte_present() still returns true and the protection reaches ioremap_prot(). A PROT_NONE mapping does not have PTE_USER, causing the existing WARN_ON_ONCE() in ioremap_prot() to fire even though this is a valid user mapping. Execute-only mappings have the same issue and must not be readable through this path either. ioremap_prot() should therefore reject protection values without PTE_USER without warning. This makes the access fail cleanly for PROT_NONE and execute-only mappings while retaining the existing user-protection contract.

—No exploit Fix available
Published
Oct 23, 2026
Updated
Oct 23, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a, 7.0affected
    • 64858b76ec67c5fc40fef8ec1841fecb78c1ebde and later · before fddc90d4af4550af410f52d11bbf6b5f36443838affected · git
    • eeecafce5afffb4da703666ebefbd4d6e2a5abf6 and later · before 0b04af3d88bb7fc69b2d92457890608860e42365affected · git
    • 3d64dcc0799c2d6921ba027716b7be721eb19fa8 and later · before b17aa4955e3a694c663ebe99626e4c76ca4f7cfbaffected · git
    • 8f098037139b294050053123ab2bc0f819d08932 and later · before 9b583795feb51f8d50203228d001760d1344ef01affected · git
    • 8f098037139b294050053123ab2bc0f819d08932 and later · before bb756b11ad63832ebee58caf9e8f9381eaecff9faffected · git
    • 6.6.143 and later · before 6.6.158affected · semver
    • 6.12.93 and later · before 6.12.112affected · semver
    • 6.18.17 and later · before 6.18.55affected · semver
    • 6.19.7 and later · before 6.20affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98921Oct 23, 2026 · ovl: fix UAF in ovl_do_mkdir() debug print
    0Monitor
  • ← EarlierCVE-2026-98922Oct 23, 2026 · net: emac: move setting of netops to fix crash
    0Monitor
  • Later →CVE-2026-98924Oct 23, 2026 · fs: avoid repeated scans in evict_inodes()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0b04af3d88bb7fc69b2d92457890608860e42365Vendor (CNA)
Linux Linux6.12.112Vendor (CNA)
Linux Linux6.18.55Vendor (CNA)
Linux Linux6.20Vendor (CNA)
Linux Linux6.6.158Vendor (CNA)
Linux Linux9b583795feb51f8d50203228d001760d1344ef01Vendor (CNA)
Linux Linuxb17aa4955e3a694c663ebe99626e4c76ca4f7cfbVendor (CNA)
Linux Linuxbb756b11ad63832ebee58caf9e8f9381eaecff9fVendor (CNA)
Linux Linuxfddc90d4af4550af410f52d11bbf6b5f36443838Vendor (CNA)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 9, 2026+17 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

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References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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