CVE-2026-74312vhost/vdpa: validate virtqueue index in mmap and fault paths
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: vhost/vdpa: validate virtqueue index in mmap and fault paths vhost_vdpa_mmap() and vhost_vdpa_fault() use vma->vm_pgoff as a virtqueue index for get_vq_notification(), but they do not validate that the index is smaller than v->nvqs. The ioctl path already performs both a bounds check and array_index_nospec(), but the mmap/fault path only checks that the index fits in u16. This allows an out-of-range queue index to reach driver-specific get_vq_notification() callbacks. Fix this by extracting a unified vhost_vdpa_get_vq_notification() helper that validates the queue index against v->nvqs and applies array_index_nospec() before calling the driver callback. Both the mmap and fault paths use this helper, and the bounds checking is consolidated into a single location. From source inspection, the most defensible impact is out-of-bounds access in the callback path, potentially leading to invalid PFN remaps and crash/DoS.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 0f310bac6db9bd3bb1655707d692d9d2a86eeb17; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 4bf5a51963ff816f7443702dc536b9327cf5e550; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 55a644031e610ea93fbde2702c7b8f267476552f; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 2b3f79b90b231a682315fe2191bb71925650e183; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before bbba4f92515238d76018e9b75e41b16d83df52c8; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d; from ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 before 929e4f044621c8cc30b612fb74e1410bef09e41b | CNA record |
References
- https://git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17
- https://git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550
- https://git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f
- https://git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183
- https://git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8
- https://git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e
- https://git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d
- https://git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.