{"id":"CVE-2026-98033","revision":"0404bfbf5cc944c7865f41d1951202d8","records":[{"revision":"0404bfbf5cc944c7865f41d1951202d8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98033","aliases":[],"title":"bpf: Preserve inner map identity in callback frames","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve inner map identity in callback frames\n\nCallback frame constructors initialize map-typed argument registers with\n__mark_reg_known_zero() and then restore map_ptr. This clears map_uid,\nwhich is the only field distinguishing inner maps that share an\ninner_map_meta template.\n\nWhen a timer callback invokes bpf_for_each_map_elem() on a second inner\nmap, both the saved first map and the second map value can reach the nested\ncallback as the same template with map_uid zero. bpf_timer_init() then\naccepts pairing the timer from the second map with the first map.\n\nThe runtime records the first map in the timer without taking a reference.\nFreeing that map does not find the timer stored in the second map, so a\nlater timer callback dereferences the freed map.\n\nCopy map_uid from the same caller register as map_ptr when constructing\nfor-each, timer/workqueue, and task-work callback arguments. The existing\nidentity check can then reject mismatched inner maps while allowing a\ncallback value to be paired with its actual map.","state":0,"publishedAt":"2026-09-25T10:23:48.761+00:00","modifiedAt":"2026-10-21T12:54:07.398+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                        \"kernel/bpf/verifier.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"69c087ba6225b574afb6e505b72cb75242a3d844\",\n                            \"lessThan\": \"cf85e4f94d7feef8b3c4c90dbe2468595a48393b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69c087ba6225b574afb6e505b72cb75242a3d844\",\n                            \"lessThan\": \"166221c52d3ca332f8699a854efca8e2704bb137\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69c087ba6225b574afb6e505b72cb75242a3d844\",\n                            \"lessThan\": \"08b534bafdd9de65b6374474a8fe719c90eb3b01\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69c087ba6225b574afb6e505b72cb75242a3d844\",\n                            \"lessThan\": \"66ff2eff093d2a0838f39c713eeb590bc0946c2a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"69c087ba6225b574afb6e505b72cb75242a3d844\",\n                            \"lessThan\": \"b90c5d770dad910fb89e6c1b15052a8a1e8db752\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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                        \"kernel/bpf/verifier.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/cf85e4f94d7feef8b3c4c90dbe2468595a48393b","https://git.kernel.org/stable/c/166221c52d3ca332f8699a854efca8e2704bb137","https://git.kernel.org/stable/c/08b534bafdd9de65b6374474a8fe719c90eb3b01","https://git.kernel.org/stable/c/66ff2eff093d2a0838f39c713eeb590bc0946c2a","https://git.kernel.org/stable/c/b90c5d770dad910fb89e6c1b15052a8a1e8db752"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98033","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98033","identifiers":["CVE-2026-98033"]},"retained":false,"historicalAffected":[]}],"coverage":[]}