CVE-2026-53281

HIGHCVSS 8.8
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 8.8Exploit: 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:

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption

Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly.

If dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally, this lead to a NULL pointer dereference or refcount corruption.

If the domain was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt.

Even if info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free for the remaining active devices sharing the domain.

Fix it by returning early if dev_pasid is NULL, before executing the teardown operations.

Issue found by AI review and suggested by Kevin Tian. https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com

CVSS v3
8.8
EG Score
—
EPSS
—
KEV
Not listed

Published

June 26, 2026

Last Modified

June 30, 2026

Advisory Details (3)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840
generic

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153
generic

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2c

Vendor Advisories for CVE-2026-53281(1)

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

Frequently asked(4)

What is CVE-2026-53281?
CVE-2026-53281 is a high vulnerability published on June 26, 2026. In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARNONONCE") fixed a NULL pointer dereference in an unlikely situation partly. If devpasid is not found in…
When was CVE-2026-53281 disclosed?
CVE-2026-53281 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-53281?
CVE-2026-53281 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-53281?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53281, 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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