Integer overflow in Linux kernel - CVE-2026-74256

Vulnerability identifier: #VU142942

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-2026-74256

CWE-ID: CWE-190

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 integer overflow in bpf_msg_pop_data() in the sockmap BPF message handling code when processing crafted start and len values. A local user can supply out-of-range values to trigger an out-of-bounds pop operation and cause a denial of service.

Exploitation can cause the pop loop to run past the end of the scatterlist and reach an invalid put_page() on an empty slot.

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/17eb9832a10db2f7a80cb429ca2bc5038445a943
• https://git.kernel.org/stable/c/9ef44ed6fb0c1db01cfcc3de432a33e719713eb5
• https://git.kernel.org/stable/c/a48802fb2cd2d1e23651989f8ff4d15e9d5dad54
• https://git.kernel.org/stable/c/ba5cc05dae8fce237d191c7ea96b1107a791e548
• https://git.kernel.org/stable/c/c05a0ec1cdced622a1a0c7d85679fe02f31033ec
• https://git.kernel.org/stable/c/d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0
• https://git.kernel.org/stable/c/e09f7bd7273928b4089e6b71f8e992f2b356ca1b
• https://git.kernel.org/stable/c/fe09dd288722f1c749b7506c0b3e7841a7d85027

• Integer overflow in Linux kernel core
• 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