linux: In the Linux kernel, the following vulnerability has been resolved: iommufd: Set veventq_depth upper bound iommufd_...
CVE-2026-64291 is fixed in 20 products on 1 platform, first by ALAS2023-2026-2045, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool6.18 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| bpftool6.18-debuginfo · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel-livepatch-6.18.39-79.141 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-debuginfo · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-debuginfo-common-aarch64 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-debuginfo-common-x86_64 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-devel · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-headers · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-modules-extra · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-modules-extra-common · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-tools · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-tools-debuginfo · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| kernel6.18-tools-devel · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| linux · Debian 14 | 7.1.4-1 | DEBIAN-CVE-2026-64291 | Aug 7, 2026 |
| microvm-kernel6.18 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| perf6.18 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| perf6.18-debuginfo · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| python3-perf6.18 · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
| python3-perf6.18-debuginfo · amzn 2023 | 1:6.18.39-79.141.amzn2023 | ALAS2023-2026-2045 | Aug 3, 2026 |
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