CVE-2025-40078 - bpf: Explicitly check accesses to bpf_sock_addr

CVE-2025-40078 - bpf: Explicitly check accesses to bpf_sock_addr

https://cvefeed.io/rssfeed/latest.atom / Tue, 10/28/2025 - 13:45
CVE ID : CVE-2025-40078
Published : Oct. 28, 2025, 12:15 p.m. | 17 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: bpf: Explicitly check accesses to bpf_sock_addr Syzkaller found a kernel warning on the following sock_addr program: 0: r0 = 0 1: r2 = *(u32 *)(r1 +60) 2: exit which triggers: verifier bug: error during ctx access conversion (0) This is happening because offset 60 in bpf_sock_addr corresponds to an implicit padding of 4 bytes, right after msg_src_ip4. Access to this padding isn't rejected in sock_addr_is_valid_access and it thus later fails to convert the access. This patch fixes it by explicitly checking the various fields of bpf_sock_addr in sock_addr_is_valid_access. I checked the other ctx structures and is_valid_access functions and didn't find any other similar cases. Other cases of (properly handled) padding are covered in new tests in a subsequent patch.
Severity: 0.0 | NA
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