CVE-2026-64292
CVE CVE-2026-64292EUVD EUVD-2026-49004Published 2026-07-25T08:49:31.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: iommufd: Move vevent memory allocation outside spinlock The veventq memory allocation happens inside the spinlock. Given its depth is decided by the user space, this leaves a vulnerability, where userspace can allocate large queues to exhaust atomic memory reserves. Move the allocation outside the spinlock and use GFP_NOWAIT, which can fail fast under memory pressure without dipping into the GFP_ATOMIC reserves or direct-reclaiming from the threaded IRQ handler. On allocation failure, queue the lost_events_header (so userspace learns of the drop) and return -ENOMEM so the caller learns of the kernel-side memory pressure. This is intentionally distinct from the queue-overflow path, which also queues the lost_events_header but returns 0: a full queue is an expected userspace-pacing condition rather than a kernel error. A subsequent change will cap the upper bound of the veventq_depth.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; e36ba5ab808ef6237c3148d469c8238674230e2b <47443565d10c51366c9382dbc8597cd6c460b8a2; patch: 7.2-rc1; e36ba5ab808ef6237c3148d469c8238674230e2b <779480ea79551c31964e74b9aef0e730faa3aa11; 6.15; patch: 7.1.4; e36ba5ab808ef6237c3148d469c8238674230e2b <6c5fc40200cd0a87d66a368eee00df4d1cca946e; patch: 6.18.40
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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