{"id":"CVE-2024-35839","summary":"netfilter: bridge: replace physindev with physinif in nf_bridge_info","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: replace physindev with physinif in nf_bridge_info\n\nAn skb can be added to a neigh-\u003earp_queue while waiting for an arp\nreply. Where original skb's skb-\u003edev can be different to neigh's\nneigh-\u003edev. For instance in case of bridging dnated skb from one veth to\nanother, the skb would be added to a neigh-\u003earp_queue of the bridge.\n\nAs skb-\u003edev can be reset back to nf_bridge-\u003ephysindev and used, and as\nthere is no explicit mechanism that prevents this physindev from been\nfreed under us (for instance neigh_flush_dev doesn't cleanup skbs from\ndifferent device's neigh queue) we can crash on e.g. this stack:\n\narp_process\n  neigh_update\n    skb = __skb_dequeue(&neigh-\u003earp_queue)\n      neigh_resolve_output(..., skb)\n        ...\n          br_nf_dev_xmit\n            br_nf_pre_routing_finish_bridge_slow\n              skb-\u003edev = nf_bridge-\u003ephysindev\n              br_handle_frame_finish\n\nLet's use plain ifindex instead of net_device link. To peek into the\noriginal net_device we will use dev_get_by_index_rcu(). Thus either we\nget device and are safe to use it or we don't get it and drop skb.","modified":"2026-03-20T12:36:41.018716Z","published":"2024-05-17T14:27:30.524Z","related":["ALSA-2024:5928","ALSA-2024:8856","ALSA-2024:8870","SUSE-SU-2025:0117-1","SUSE-SU-2025:0153-1","SUSE-SU-2025:0154-1","SUSE-SU-2025:02334-1","SUSE-SU-2025:0289-1","SUSE-SU-2025:20165-1","SUSE-SU-2025:20166-1","SUSE-SU-2025:20248-1","SUSE-SU-2025:20249-1","USN-6818-2","USN-6819-2"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35839.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/544add1f1cfb78c3dfa3e6edcf4668f6be5e730c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9325e3188a9cf3f69fc6f32af59844bbc5b90547"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9874808878d9eed407e3977fd11fee49de1e1d86"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35839.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-35839"},{"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":"c4e70a87d975d1f561a00abfe2d3cefa2a486c95"},{"fixed":"7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b"},{"fixed":"9325e3188a9cf3f69fc6f32af59844bbc5b90547"},{"fixed":"544add1f1cfb78c3dfa3e6edcf4668f6be5e730c"},{"fixed":"9874808878d9eed407e3977fd11fee49de1e1d86"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-35839.json"}}],"schema_version":"1.7.5"}