{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53096",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53096"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53096"
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      "scenario": "AV:L - The vulnerable path requires local BPF/netlink setup of an XDP program using a DEVMAP_HASH broadcast redirect and concurrent map update/delete operations. Network packets can trigger the packet-side reader after setup, but the exploit control path is local.\nAC:L - The attacker can control both sides of the race by driving packets through the attached XDP program while another local thread updates or deletes devmap-hash entries. Weakly ordered architectures such as ARM64/POWER are common reasonable deployments, so this is not a rare external condition.\nPR:L - The path requires BPF/CAP_NET_ADMIN-style privileges to create/update the map and load/attach XDP, but these can be available to a low-privileged local attacker through namespace/delegated BPF-token scenarios. It is not reachable by an unauthenticated remote attacker.\nUI:N - No victim action is needed once the attacker has the local privileges and can run the racing BPF/map operations. Packet delivery and map syscalls are attacker-driven.\nS:U - The impact remains within the kernel and the network namespace/security authority being attacked. This is standard kernel memory-safety exposure, not a VM escape or separate-scope boundary bypass.\nC:H - The unsafe non-RCU traversal can observe partially constructed or inconsistent bpf_dtab_netdev objects and dereference attacker-influenced stale kernel pointers. Given the kernel pointer misuse and heap-shaping potential, high confidentiality impact is defensible.\nI:H - The same stale or partially initialized dev/xdp_prog pointers can be used in redirect and BPF program execution paths, making control-flow or object-confusion style corruption plausible. Under the required overestimate rule, this supports high integrity impact.\nA:H - At minimum, dereferencing inconsistent devmap entries can crash or oops the kernel in the packet redirect path. The race is repeatable by the local attacker, so availability impact is high."
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}