Out-of-bounds read in Linux kernel - CVE-2026-74312

Vulnerability identifier: #VU142878

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74312

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to out-of-bounds access in vhost_vdpa_mmap() and vhost_vdpa_fault() when processing a virtqueue index from vm_pgoff. A local user can provide an out-of-range queue index to trigger driver-specific get_vq_notification() callbacks and cause a denial of service.

The issue may lead to invalid PFN remaps in the callback path.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17
• https://git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e
• https://git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183
• https://git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d
• https://git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550
• https://git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f
• https://git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b
• https://git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8

• Out-of-bounds read in Linux kernel vhost driver
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0