SB20260928201 - Improper Validation of Specified Type of Input in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Validation of Specified Type of Input (CVE-ID: CVE-2026-98007)

CWE-ID: CWE-1287 - Improper Validation of Specified Type of Input

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper validation of helper argument types in the bpf_loop() nr_loops argument in the BPF verifier when a privileged BPF program passes a pointer value as the iteration count. A local privileged user can submit a privileged BPF program with a pointer-valued iteration count to trigger a verifier warning and kernel panic.

Exploitation requires a kernel configured with panic_on_warn enabled.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/656d40d1ca228ee21a9b3280432479fc9eae75ab
• https://git.kernel.org/stable/c/c3fd8e5fd100f122bad503bdc0e9277219533253
• https://git.kernel.org/stable/c/e2e1161e03fecff6d2229a81b024337144bfcd97
• https://git.kernel.org/stable/c/f8ae8275c721334ee50fafdd986fb83294eb941a