{"id":"CVE-2026-53096","revision":"b5e941e0b3e948b69354d398903fd51b","records":[{"revision":"b5e941e0b3e948b69354d398903fd51b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53096","aliases":[],"title":"bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path\n\nThe DEVMAP_HASH branch in dev_map_redirect_multi() uses\nhlist_for_each_entry_safe() to iterate hash buckets, but this function\nruns under RCU protection (called from xdp_do_generic_redirect_map()\nin softirq context). Concurrent writers (__dev_map_hash_update_elem,\ndev_map_hash_delete_elem) modify the list using RCU primitives\n(hlist_add_head_rcu, hlist_del_rcu).\n\nhlist_for_each_entry_safe() performs plain pointer dereferences without\nrcu_dereference(), missing the acquire barrier needed to pair with\nwriters' rcu_assign_pointer(). On weakly-ordered architectures (ARM64,\nPOWER), a reader can observe a partially-constructed node. It also\ndefeats CONFIG_PROVE_RCU lockdep validation and KCSAN data-race\ndetection.\n\nReplace with hlist_for_each_entry_rcu() using rcu_read_lock_bh_held()\nas the lockdep condition, consistent with the rcu_dereference_check()\nused in the DEVMAP (non-hash) branch of the same functions. Also fix\nthe same incorrect lockdep_is_held(&dtab->index_lock) condition in\ndev_map_enqueue_multi(), where the lock is not held either.","state":0,"publishedAt":"2026-06-24T16:30:34.477+00:00","modifiedAt":"2026-10-19T19:57:24.715+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/devmap.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"4a3d0fe30b907ff324b1b49756f7e713d67f3645\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"b089aa6e94d7a08e74d076a0fe274842dc9feccc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"571a05ea1baaccc0dc1e0d227b2cbc978b96d392\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"d4c4bd231ebad70e6f30db429e9640bf378b2f52\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"7027e705062482a8cea43a1c13ede3c35653966f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e624d4ed4aa8cc3c69d1359b0aaea539203ed266\",\n                            \"lessThan\": \"8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19\",\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/devmap.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.141\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.91\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.33\",\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/4a3d0fe30b907ff324b1b49756f7e713d67f3645","https://git.kernel.org/stable/c/b089aa6e94d7a08e74d076a0fe274842dc9feccc","https://git.kernel.org/stable/c/571a05ea1baaccc0dc1e0d227b2cbc978b96d392","https://git.kernel.org/stable/c/cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a","https://git.kernel.org/stable/c/d4c4bd231ebad70e6f30db429e9640bf378b2f52","https://git.kernel.org/stable/c/7027e705062482a8cea43a1c13ede3c35653966f","https://git.kernel.org/stable/c/8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53096","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53096","identifiers":["CVE-2026-53096"]},"retained":false,"historicalAffected":[]}],"coverage":[]}