{"id":"CVE-2026-53078","revision":"c6ec3b73254a476f81e8aa07ae5292f2","records":[{"revision":"c6ec3b73254a476f81e8aa07ae5292f2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53078","aliases":[],"title":"bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops","description":"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->dst_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->temp.","state":0,"publishedAt":"2026-06-24T16:30:18.858+00:00","modifiedAt":"2026-10-19T19:47:15.752+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/filter.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"db1200ec2c3ddf119d4d9ba67982063df06bbacb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"4c1c5efd9d1d74743d41ce4e1600501b4feb6827\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"0e6b30657bbc771f38025c828d722b6162428508\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"64eaf4ecda007140ddcdb28e00c48c9c69aaba39\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"2a2c98141e0a75f2d4a7d78b0316c88b3da784ac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"22400725de070b787cd6d806c5795370ab46d269\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"18e3ffde1822f0b48b1753bf34aa97ce839df1d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fd09af010788a884de1c39537c288830c3d305db\",\n                            \"lessThan\": \"10f86a2a5c91fc4c4d001960f1c21abe52545ef6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"48be3df15aa19c04eadf156c9129293c9a10389f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cd4644d904e1d153d516e73e2e127e7a2fe687e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6e0bc946cbeec538322820786b5fb5200a2216ab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a7e52f7f675046d9ffc5692d815fa67c82fcdbf5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.7.18\",\n                            \"lessThan\": \"5.8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.8.4\",\n                            \"lessThan\": \"5.9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.61\",\n                            \"lessThan\": \"5.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/filter.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.42\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.10\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb","https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827","https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508","https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39","https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac","https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269","https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8","https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53078","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53078","identifiers":["CVE-2026-53078"]},"retained":false,"historicalAffected":[]}],"coverage":[]}