SB20261022432 - Integer overflow in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-98816)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 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]

The vulnerability allows a local user to cause a denial of service by crashing the kernel.

The vulnerability exists due to a signed integer overflow in bpf_jit_blind_insn() when adjusting backward jump offsets during BPF constant blinding. A local user can run a specially crafted BPF program with a backward jump offset of -32767 or -32768 to make the adjusted offset wrap around, directing execution beyond the end of the program and crashing the kernel.

Exploitation requires bpf_jit_harden=2.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/443328237113ee0ea515e506497334d871dbc2aa
• https://git.kernel.org/stable/c/ad139384ecddb6f3e7e3c3c12765aafae0e39670