{"cve":"CVE-2026-53281","nvd":{"published":"2026-06-26T20:17:19.600","modified":"2026-10-21T13:19:13.667","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Avoid NULL pointer dereference or refcount corruption\n\nCommit 60f030f7418d (\"iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE\")\nfixed a NULL pointer dereference in an unlikely situation partly.\n\nIf dev_pasid is not found in the dev_pasids list, it remains NULL.\nHowever, the teardown operations are executed unconditionally, this lead\nto a NULL pointer dereference or refcount corruption.\n\nIf the domain was never attached to this IOMMU, info will be NULL, which\nwould cause an immediate dereference when checking --info->refcnt.\n\nEven if info is not NULL, decrementing the refcount without having removed\na valid PASID might unbalance the count. This could lead to premature\ndropping of the refcount to 0, potentially causing a use-after-free for the\nremaining active devices sharing the domain.\n\nFix it by returning early if dev_pasid is NULL, before executing the\nteardown operations.\n\nIssue found by AI review and suggested by Kevin Tian.\nhttps://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2c","https://git.kernel.org/stable/c/9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153","https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840","https://git.kernel.org/stable/c/d1a677f9c5e02c4ae49614044ac21296660d1391","https://access.redhat.com/errata/RHSA-2026:47017"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-53281","score":0.00186,"percentile":0.08157,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}