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.
References
Configurations
Configuration 1 (hide)
|
History
12 Aug 2026, 15:06
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/47443565d10c51366c9382dbc8597cd6c460b8a2 - Patch | |
| References | () https://git.kernel.org/stable/c/6c5fc40200cd0a87d66a368eee00df4d1cca946e - Patch | |
| References | () https://git.kernel.org/stable/c/779480ea79551c31964e74b9aef0e730faa3aa11 - Patch | |
| CWE | CWE-401 | |
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
25 Jul 2026, 10:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-25 10:17
Updated : 2026-08-12 15:06
NVD link : CVE-2026-64292
Mitre link : CVE-2026-64292
CVE.ORG link : CVE-2026-64292
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-401
Missing Release of Memory after Effective Lifetime