{"id":"CVE-2026-53078","summary":"bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix same-register dst/src OOB read and pointer leak in sock_ops\n\nWhen a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,\nthe SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the\ndestination register in the !fullsock / !locked_tcp_sock path.\n\nBoth macros borrow a temporary register to check is_fullsock /\nis_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the\nctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with\na request_sock), dst_reg should be zeroed but is not, leaving the stale\nctx pointer:\n\n - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks\n   as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,\n   leading to stack-out-of-bounds access in helpers like\n   bpf_skc_to_tcp6_sock().\n\n - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the\n   verifier believes is a SCALAR_VALUE, leaking a kernel pointer.\n\nFix both macros by:\n - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the\n   added instruction.\n - Adding BPF_MOV64_IMM(si-\u003edst_reg, 0) after the temp register\n   restore in the !fullsock path, placed after the restore because\n   dst_reg == src_reg means we need src_reg intact to read ctx-\u003etemp.","modified":"2026-11-13T04:06:11.302612216Z","published":"2026-06-24T16:30:18.858Z","related":["SUSE-SU-2026:22742-1","SUSE-SU-2026:22769-1","SUSE-SU-2026:22809-1","SUSE-SU-2026:22810-1","SUSE-SU-2026:22812-1","SUSE-SU-2026:22835-1","SUSE-SU-2026:22903-1","SUSE-SU-2026:22904-1","SUSE-SU-2026:3130-1","SUSE-SU-2026:3166-1","openSUSE-SU-2026:21388-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53078.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508"},{"type":"WEB","url":"https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53078.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53078"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fd09af010788a884de1c39537c288830c3d305db"},{"fixed":"db1200ec2c3ddf119d4d9ba67982063df06bbacb"},{"fixed":"4c1c5efd9d1d74743d41ce4e1600501b4feb6827"},{"fixed":"0e6b30657bbc771f38025c828d722b6162428508"},{"fixed":"64eaf4ecda007140ddcdb28e00c48c9c69aaba39"},{"fixed":"2a2c98141e0a75f2d4a7d78b0316c88b3da784ac"},{"fixed":"22400725de070b787cd6d806c5795370ab46d269"},{"fixed":"18e3ffde1822f0b48b1753bf34aa97ce839df1d8"},{"fixed":"10f86a2a5c91fc4c4d001960f1c21abe52545ef6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"48be3df15aa19c04eadf156c9129293c9a10389f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cd4644d904e1d153d516e73e2e127e7a2fe687e1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6e0bc946cbeec538322820786b5fb5200a2216ab"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a7e52f7f675046d9ffc5692d815fa67c82fcdbf5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef"}]}],"versions":["v5.7.19","v5.7.18","v5.8.18","v5.8.17","v5.8.16","v5.8.15","v5.8.14","v5.8.13","v5.8.12","v5.8.11","v5.8.10","v5.8.9","v5.8.8","v5.8.7","v5.8.6","v5.8.5","v5.8.4","v5.4.302","v5.4.301","v5.4.300","v5.4.299","v5.4.298","v5.4.297","v5.4.296","v5.4.295","v5.4.294","v5.4.293","v5.4.292","v5.4.291","v5.4.290","v5.4.289","v5.4.288","v5.4.287","v5.4.286","v5.4.285","v5.4.284","v5.4.283","v5.4.282","v5.4.281","v5.4.280","v5.4.279","v5.4.278","v5.4.277","v5.4.276","v5.4.275","v5.4.274","v5.4.273","v5.4.272","v5.4.271","v5.4.270","v5.4.269","v5.4.268","v5.4.267","v5.4.266","v5.4.265","v5.4.264","v5.4.263","v5.4.262","v5.4.261","v5.4.260","v5.4.259","v5.4.258","v5.4.257","v5.4.256","v5.4.255","v5.4.254","v5.4.253","v5.4.252","v5.4.251","v5.4.250","v5.4.249","v5.4.248","v5.4.247","v5.4.246","v5.4.245","v5.4.244","v5.4.243","v5.4.242","v5.4.241","v5.4.240","v5.4.239","v5.4.238","v5.4.237","v5.4.236","v5.4.235","v5.4.234","v5.4.233","v5.4.232","v5.4.231","v5.4.230","v5.4.229","v5.4.228","v5.4.227","v5.4.226","v5.4.225","v5.4.224","v5.4.223","v5.4.222","v5.4.221","v5.4.220","v5.4.219","v5.4.218","v5.4.217","v5.4.216","v5.4.215","v5.4.214","v5.4.213","v5.4.212","v5.4.211","v5.4.210","v5.4.209","v5.4.208","v5.4.207","v5.4.206","v5.4.205","v5.4.204","v5.4.203","v5.4.202","v5.4.201","v5.4.200","v5.4.199","v5.4.198","v5.4.197","v5.4.196","v5.4.195","v5.4.194","v5.4.193","v5.4.192","v5.4.191","v5.4.190","v5.4.189","v5.4.188","v5.4.187","v5.4.186","v5.4.185","v5.4.184","v5.4.183","v5.4.182","v5.4.181","v5.4.180","v5.4.179","v5.4.178","v5.4.177","v5.4.176","v5.4.175","v5.4.174","v5.4.173","v5.4.172","v5.4.171","v5.4.170","v5.4.169","v5.4.168","v5.4.167","v5.4.166","v5.4.165","v5.4.164","v5.4.163","v5.4.162","v5.4.161","v5.4.160","v5.4.159","v5.4.158","v5.4.157","v5.4.156","v5.4.155","v5.4.154","v5.4.153","v5.4.152","v5.4.151","v5.4.150","v5.4.149","v5.4.148","v5.4.147","v5.4.146","v5.4.145","v5.4.144","v5.4.143","v5.4.142","v5.4.141","v5.4.140","v5.4.139","v5.4.138","v5.4.137","v5.4.136","v5.4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