CVE-2026-53281 is a vulnerability in Linux Kernel
Published on June 26, 2026
iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
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
Products Associated with CVE-2026-53281
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Affected Versions
Linux:- Version 60f030f7418d3f1d94f2fb207fe3080e1844630b and below 9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153 is affected.
- Version 60f030f7418d3f1d94f2fb207fe3080e1844630b and below cdfe3c9f2c9e28a8651ee463c88ad191ced2f840 is affected.
- Version 60f030f7418d3f1d94f2fb207fe3080e1844630b and below 79ea2feb917b05366b49d85573c9c5331f043b2c is affected.
- Version 68ec78beb4a3fb0877cbaaf49758c85410c05977 is affected.
- Version df96876be3b064aefc493f760e0639765d13ed0d is affected.
- Version 6.12.57 and below 6.13 is affected.
- Version 6.13.3 and below 6.14 is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 6.18.33, <= 6.18.* is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.