CVE-2026-74312: vhost/vdpa: validate virtqueue index in mmap and fault paths
Vulnerability summary
CVE-2026-74312 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 24 · Related 24Timeline
- 15-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
Description
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.13%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
Decrease -0.05 pp
From 0.18% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
- linux≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 0f310bac6db9bd3bb1655707d692d9d2a86eeb17 | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 4bf5a51963ff816f7443702dc536b9327cf5e550 | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 55a644031e610ea93fbde2702c7b8f267476552f | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 2b3f79b90b231a682315fe2191bb71925650e183 | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < bbba4f92515238d76018e9b75e41b16d83df52c8 | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d | ≥ ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9, < 929e4f044621c8cc30b612fb74e1410bef09e41b | 5.8
3 vendors · 159 products
