CVE-2025-40078 (GCVE-0-2025-40078)
Vulnerability from cvelistv5
Published
2025-10-28 11:48
Modified
2025-10-29 13:19
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
Version: 1cedee13d25ab118d325f95588c1a084e9317229
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{
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          "value": "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: 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\u0027t 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\u0027t find any other similar cases. Other cases of (properly handled)\npadding are covered in new tests in a subsequent patch."
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        "dateUpdated": "2025-10-29T13:19:59.525Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2025-40078",
    "datePublished": "2025-10-28T11:48:43.548Z",
    "dateReserved": "2025-04-16T07:20:57.160Z",
    "dateUpdated": "2025-10-29T13:19:59.525Z",
    "state": "PUBLISHED"
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  }
}


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