CVE-2026-53281iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
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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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 60f030f7418d3f1d94f2fb207fe3080e1844630b before 9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153; from 60f030f7418d3f1d94f2fb207fe3080e1844630b before cdfe3c9f2c9e28a8651ee463c88ad191ced2f840; from 60f030f7418d3f1d94f2fb207fe3080e1844630b before 79ea2feb917b05366b49d85573c9c5331f043b2c; 68ec78beb4a3fb0877cbaaf49758c85410c05977; df96876be3b064aefc493f760e0639765d13ed0d; from 6.12.57 before 6.13; from 6.13.3 before 6.14 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.40.1.el10_2 not affected | CISA ADP |
linux linux_kernel linux:linux_kernel | from 6.12.57 before 6.13; from 6.13.3 before 6.18.33; from 6.19 before 7.0.10; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153patch
- https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840patch
- https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2cpatch
- https://access.redhat.com/errata/RHSA-2026:47017
- https://access.redhat.com/errata/RHSA-2026:47040
- https://access.redhat.com/security/cve/CVE-2026-53281third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2493728issue-tracking, third-party-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53281.jsonthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.