CVE-2026-80633
8.8 · HIGHOverview
CVE-2026-80633 is a high-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
iommufd: Take dma_resv lock before dma_buf_unpin() in release path
dma_buf_unpin() requires the caller to hold the exporter's dma_resv
lock:
void dma_buf_unpin(struct dma_buf_attachment *attach)
{
...
dma_resv_assert_held(dmabuf->resv);
...
}
iopt_release_pages() calls dma_buf_unpin() without taking that lock,
so every iommufd_ioas_destroy()/iommufd_ioas_unmap() that releases
the last reference on a DMABUF-backed iopt_pages triggers a WARN.
This was hit while running tools/testing/selftests/iommu/iommufd:
WARNING: drivers/dma-buf/dma-buf.c:1137 at dma_buf_unpin+0x62/0x70
RIP: 0010:dma_buf_unpin+0x62/0x70
Call Trace:
<TASK>
dma_buf_unpin+0x62/0x70
iopt_release_pages+0xe4/0x190
iopt_unmap_iova_range+0x1c7/0x290
iopt_unmap_all+0x1a/0x30
iommufd_ioas_destroy+0x1d/0x50
iommufd_fops_release+0x93/0x150
__fput+0xfc/0x2c0
__x64_sys_close+0x3d/0x80
do_s
Remediation
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Frequently Asked Questions
What is CVE-2026-80633?
CVE-2026-80633 is a high-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2026-80633?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-80633?
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-80633?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-80633 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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