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Linux KernelOperating system · Linux

CVE-2026-43351

MEDIUM · 5.5 CVSS v3.1 Published 2026-05-08
Fix available
A fix is available. Upgrade to 6.18.19 / 6.19.9 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: KVM: arm64: Eagerly init vgic dist/redist on vgic creation If vgic_allocate_private_irqs_locked() fails for any odd reason, we exit kvm_vgic_create() early, leaving dist->rd_regions uninitialised. kvm_vgic_dist_destroy() then comes along and walks into the weeds trying to free the RDs. Got to love this stuff. Solve it by moving all the static initialisation early, and make sure that if we fail halfway, we're in a reasonable shape to perform the rest of the teardown. While at it, reset the vgic model on failure, just in case...

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:>= 6.14.1, < 6.18.19>= 6.19, < 6.19.9= 6.14= 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 6.18.19 / 6.19.9 or later
Fixed in 6.18.196.19.9
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 6.18.19 (for 6.18.x branch) or 6.19.9 (for 6.19.x branch)

  1. 1. Identify the currently running kernel version using 'uname -r'
  2. 2. Check if the running version is in the affected range: >= 6.14.1 and < 6.18.19, OR >= 6.19 and < 6.19.9, OR exactly 6.14 or 7.0
  3. 3. If affected, schedule a maintenance window for kernel upgrade
  4. 4. Update package repositories and upgrade the kernel package to version 6.18.19 or 6.19.9 (depending on your branch)
  5. 5. Reboot the system to load the patched kernel
  6. 6. Verify the fix is applied by checking 'uname -r' shows the patched version and confirming KVM arm64 vgic functionality works correctly
Caveat Kernel upgrades may require reboot and could have compatibility implications with custom modules or specific hardware configurations; test in staging environment first

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-2026-43351 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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