CVE-2026-23346

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-03-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

arm64: io: Extract user memory type in ioremap_prot()

The only caller of ioremap_prot() outside of the generic ioremap() implementation is generic_access_phys(), which passes a 'pgprot_t' value determined from the user mapping of the target 'pfn' being accessed by the kernel. On arm64, the 'pgprot_t' contains all of the non-address bits from the pte, including the permission controls, and so we end up returning a new user mapping from ioremap_prot() which faults when accessed from the kernel on systems with PAN:

| Unable to handle kernel read from unreadable memory at virtual address ffff80008ea89000 | ... | Call trace: | __memcpy_fromio+0x80/0xf8 | generic_access_phys+0x20c/0x2b8 | __access_remote_vm+0x46c/0x5b8 | access_remote_vm+0x18/0x30 | environ_read+0x238/0x3e8 | vfs_read+0xe4/0x2b0 | ksys_read+0xcc/0x178 | __arm64_sys_read+0x4c/0x68

Extract only the memory type from the user 'pgprot_t' in ioremap_prot() and assert that we're being passed a user mapping, to protect us against any changes in future that may require additional handling. To avoid falsely flagging users of ioremap(), provide our own ioremap() macro which simply wraps __ioremap_prot().

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.8%
KEV
Not listed

Published

March 25, 2026

Last Modified

June 19, 2026

Advisory Details (5)

Auto-updated Jun 19, 2026
No patch confirmed yet.
generic

arm64: io: Extract user memory type in ioremap_prot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eeecafce5afffb4da703666ebefbd4d6e2a5abf6
generic

arm64: io: Extract user memory type in ioremap_prot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a
generic

arm64: io: Extract user memory type in ioremap_prot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8f098037139b294050053123ab2bc0f819d08932
generic

arm64: io: Extract user memory type in ioremap_prot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/64858b76ec67c5fc40fef8ec1841fecb78c1ebde
generic

arm64: io: Extract user memory type in ioremap_prot() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3d64dcc0799c2d6921ba027716b7be721eb19fa8

Vendor Advisories for CVE-2026-23346(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.18.17—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Data Freshness Timeline

(refreshed 11× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 114 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
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  23. 2026-06-29 05:02 UTCOSV refresh
  24. 2026-06-28 14:07 UTCEPSS rescore
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  1. 2026-06-28 04:56 UTCEPSS rescore
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  27. 2026-06-11 23:32 UTCEG score recompute
  28. 2026-06-11 23:32 UTCGHSA enrichment
  29. 2026-06-11 14:00 UTCEPSS rescore
  30. 2026-06-10 22:18 UTCEPSS rescore
  31. 2026-06-10 17:28 UTCEG score recompute
  32. 2026-06-10 17:28 UTCGHSA enrichment
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  34. 2026-06-09 15:56 UTCEG score recompute
  35. 2026-06-09 15:56 UTCGHSA enrichment
  36. 2026-06-09 11:29 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  37. 2026-06-09 11:19 UTCMITRE cvelistV5
  38. 2026-06-08 14:32 UTCEG score recompute
  39. 2026-06-08 14:32 UTCGHSA enrichment
  40. 2026-06-08 14:17 UTCEPSS rescore
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  42. 2026-06-07 15:25 UTCEPSS rescore
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  44. 2026-06-07 12:32 UTCEG score recompute
  45. 2026-06-07 12:32 UTCGHSA enrichment
  46. 2026-06-06 13:47 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-23346?
CVE-2026-23346 is a medium vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: arm64: io: Extract user memory type in ioremap_prot() The only caller of ioremap_prot() outside of the generic ioremap() implementation is genericaccessphys(), which passes a 'pgprot_t' value determined from the user mapping of the…
When was CVE-2026-23346 disclosed?
CVE-2026-23346 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23346 actively exploited?
CVE-2026-23346 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23346?
CVE-2026-23346 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23346?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23346, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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