{"id":"CVE-2025-40078","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Explicitly check accesses to bpf_sock_addr\n\nSyzkaller found a kernel warning on the following sock_addr program:\n\n    0: r0 = 0\n    1: r2 = *(u32 *)(r1 +60)\n    2:…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Explicitly check accesses to bpf_sock_addr\n\nSyzkaller found a kernel warning on the following sock_addr program:\n\n    0: r0 = 0\n    1: r2 = *(u32 *)(r1 +60)\n    2:…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < de44cdc50d2dce8718cb57deddf9cf1be9a7759f","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 76e04bbb4296fb6eac084dbfc27e02ccc744db3e","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 4f00858cd9bbbdf67159e28b85a8ca9e77c83622","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < cdeafacb4f9ff261a96baef519e29480fd7b1019","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < fe9d33f0470350558cb08cecb54cf2267b3a45d2","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69","Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 6fabca2fc94d33cdf7ec102058983b086293395f","Linux 4.18"],"published":"2025-10-28","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:05.413","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40078","references":[{"url":"https://git.kernel.org/stable/c/4f00858cd9bbbdf67159e28b85a8ca9e77c83622","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6fabca2fc94d33cdf7ec102058983b086293395f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/76e04bbb4296fb6eac084dbfc27e02ccc744db3e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cdeafacb4f9ff261a96baef519e29480fd7b1019","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/de44cdc50d2dce8718cb57deddf9cf1be9a7759f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fe9d33f0470350558cb08cecb54cf2267b3a45d2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00245,"epssPercentile":0.15619,"ingestedAt":"2026-09-08T15:33:26.996Z","slug":"CVE-2025-40078","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Explicitly check accesses to bpf_sock_addr\n\nSyzkaller found a kernel warning on the following sock_addr program:\n\n    0: r0 = 0\n    1: r2 = *(u32 *)(r1 +60)\n    2: exit\n\nwhich triggers:\n\n    verifier bug: error during ctx access conversion (0)\n\nThis is happening because offset 60 in bpf_sock_addr corresponds to an\nimplicit padding of 4 bytes, right after msg_src_ip4. Access to this\npadding isn't rejected in sock_addr_is_valid_access and it thus later\nfails to convert the access.\n\nThis patch fixes it by explicitly checking the various fields of\nbpf_sock_addr in sock_addr_is_valid_access.\n\nI checked the other ctx structures and is_valid_access functions and\ndidn't find any other similar cases. Other cases of (properly handled)\npadding are covered in new tests in a subsequent patch.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}