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CVE-2026-74312— vhost/vdpa: validate virtqueue index in mmap and fault paths

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于vhost/vdpa的mmap和fault路径对virtqueue索引验证不足，可能导致越界访问，进而导致无效PFN重映射和崩溃/拒绝服务。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 0f310bac6db9bd3bb1655707d692d9d2a86eeb17 affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 4bf5a51963ff816f7443702dc536b9327cf5e550 affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 55a644031e610ea93fbde2702c7b8f267476552f affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 2b3f79b90b231a682315fe2191bb71925650e183 affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< bbba4f92515238d76018e9b75e41b16d83df52c8 affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d affected
ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9< 929e4f044621c8cc30b612fb74e1410bef09e41b affected
… +10 more rows
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I. Basic Information for CVE-2026-74312

Vulnerability Information
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Vulnerability Title
vhost/vdpa: validate virtqueue index in mmap and fault paths
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于vhost/vdpa的mmap和fault路径对virtqueue索引验证不足，可能导致越界访问，进而导致无效PFN重映射和崩溃/拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 ~ 0f310bac6db9bd3bb1655707d692d9d2a86eeb17 -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-74312

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III. Intelligence Information for CVE-2026-74312

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Patches & Fixes for CVE-2026-74312 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-74315 9.8 CRITICAL lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()
CVE-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74312

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