CVE-2026-64292
iommufd: Move vevent memory allocation outside spinlock
Description
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Move vevent memory allocation outside the spinlock.
- Use GFP_NOWAIT for allocations.
- Queue lost_events_header on allocation failure.
- Return -ENOMEM on allocation failure.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64292.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64292 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64292
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64292 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64292 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '779480ea79551c31964e74b9aef0e730faa3aa11', 'versionType': 'git'}, {'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '6c5fc40200cd0a87d66a368eee00df4d1cca946e', 'versionType': 'git'}, {'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '47443565d10c51366c9382dbc8597cd6c460b8a2', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/driver.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.15', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/driver.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '779480ea79551c31964e74b9aef0e730faa3aa11', 'versionType': 'git'}, {'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '6c5fc40200cd0a87d66a368eee00df4d1cca946e', 'versionType': 'git'}, {'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '47443565d10c51366c9382dbc8597cd6c460b8a2', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/driver.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.15', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/driver.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-401 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.15 up to (excluding) 6.18.40 Added Reference Type kernel.org: https://git.kernel.org/stable/c/47443565d10c51366c9382dbc8597cd6c460b8a2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6c5fc40200cd0a87d66a368eee00df4d1cca946e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/779480ea79551c31964e74b9aef0e730faa3aa11 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '779480ea79551c31964e74b9aef0e730faa3aa11', 'versionType': 'git'}, {'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '6c5fc40200cd0a87d66a368eee00df4d1cca946e', 'versionType': 'git'}, {'status': 'affected', 'version': 'e36ba5ab808ef6237c3148d469c8238674230e2b', 'lessThan': '47443565d10c51366c9382dbc8597cd6c460b8a2', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/driver.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.15', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/driver.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/47443565d10c51366c9382dbc8597cd6c460b8a2 Added Reference https://git.kernel.org/stable/c/6c5fc40200cd0a87d66a368eee00df4d1cca946e Added Reference https://git.kernel.org/stable/c/779480ea79551c31964e74b9aef0e730faa3aa11