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Linux KernelOperating system · Linux

CVE-2026-23346

MEDIUM · 5.5 CVSS v3.1 Published 2026-03-25
Fix available
A fix is available. Upgrade to 6.18.17 / 6.19.7 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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().

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 6.0.1, < 6.18.17>= 6.19, < 6.19.7= 6.0= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.18.17 / 6.19.7 or later
Fixed in 6.18.176.19.7
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 6.18.17 or later in the 6.18.y stable branch, or 6.19.7 or later in the 6.19.y stable branch

  1. 1. Identify the current running kernel version using 'uname -r' or 'cat /proc/version'
  2. 2. Check if the installed kernel version is affected: 6.0, 6.0.1-6.18.16, or 6.19.0-6.19.6
  3. 3. If affected, update the package manager and upgrade the kernel package to version 6.18.17 or later, or 6.19.7 or later
  4. 4. After kernel upgrade, reboot the system to load the new kernel
  5. 5. Verify the fix is applied by checking the kernel version ('uname -r') and confirming it's >= 6.18.17 or >= 6.19.7
  6. 6. On arm64 systems with PAN enabled, verify the vulnerability is resolved by testing the functionality that was failing (generic_access_phys via access_remote_vm)
Caveat Kernel upgrades may introduce compatibility changes with existing modules or software; ensure all kernel modules are rebuilt for the new version and verify critical software functionality after reboot

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-23346 in production — separate from our analysis above.

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