SB20260727226 - NULL pointer dereference in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-64353)

CWE-ID: CWE-476 - NULL Pointer Dereference

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.

The vulnerability exists due to improper handling of lookup result nullness in the bpf verifier when processing constant-key lookups for dynamic inner array maps. A local user can load a crafted bpf program to cause a denial of service.

The issue occurs when an ARRAY_OF_MAPS uses an inner map template created with BPF_F_INNER_MAP and a concrete inner array has a different max_entries value than the template.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0b92ad64d6e4bde85e6b9888404f9a7a2b65d269
• https://git.kernel.org/stable/c/53040a81ae57cdca8af8ac36fe4e661730cf7c6b
• https://git.kernel.org/stable/c/d57db0d975053e01410c54e708a85b6d32ef2ebd