Description (CNA)
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
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 68ec78beb4a3fb0877cbaaf49758c85410c05977 before d1a677f9c5e02c4ae49614044ac21296660d1391; affected 60f030f7418d3f1d94f2fb207fe3080e1844630b before 9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153; affected 60f030f7418d3f1d94f2fb207fe3080e1844630b before cdfe3c9f2c9e28a8651ee463c88ad191ced2f840; affected 60f030f7418d3f1d94f2fb207fe3080e1844630b before 79ea2feb917b05366b49d85573c9c5331f043b2c; affected df96876be3b064aefc493f760e0639765d13ed0d; affected 6.12.57 before 6.12.114; affected 6.13.3 before 6.14 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.12.114 through 6.12.*; unaffected 6.18.33 through 6.18.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/d1a677f9c5e02c4ae49614044ac21296660d1391
- https://git.kernel.org/stable/c/9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153
- https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840
- https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2c
ADP enrichment
A flaw was found in the Linux kernel's Input-Output Memory Management Unit (IOMMU) virtualized direct memory access (VT-d) component. This vulnerability occurs when the system attempts to perform cleanup operations without a valid device identifier, leading to a null pointer dereference or incorrect management of resource references. An attacker with local access could exploit this to cause a system crash, resulting in a denial of service (DoS).
No English description supplied.
No references supplied.