PT-2026-64512 · Linux · Linux

CVE-2026-64291 · Published 2026-07-25 · Updated 2026-07-25

NVD

In the Linux kernel, the following vulnerability has been resolved:

iommufd: Set veventq depth upper bound

iommufd veventq alloc() accepts any !0 veventq depth from userspace, with an upper bound at U32 MAX.

This leaves a vulnerability where userspace can allocate excessively large queues to exhaust kernel memory reserves.

Cap the veventq depth (maximum number of entries) to 1 << 19, matching the maximum number of entries in the SMMUv3 EVTQ (the largest use case today).

Related Identifiers

CVE-2026-64291

Affected Products

Linux

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-64291 · Security Note
• https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba · Note
• https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43 · Note
• https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff · Note