Incorrect calculation in Linux kernel - CVE-2026-92518

Vulnerability identifier: #VU151003

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-92518

CWE-ID: CWE-682

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause kernel stack corruption.

The vulnerability exists due to an incorrect tailcall jump-offset calculation in the RISC-V BPF JIT compiler when executing BPF tail calls with CONFIG_CFI_CLANG enabled. A local user can trigger the erroneous tailcall jump to cause kernel stack corruption.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/34b1bb33a025787e05f966e74de18cd36276f801
• https://git.kernel.org/stable/c/52fb1756ea1d2759dfef2d86245be00b05dac3a2
• https://git.kernel.org/stable/c/a6e11a81da3420fd37f1518d4f238c4d5784086e

• Incorrect calculation in Linux kernel riscv net
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more