{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52910",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-52910"
  ],
  "published": "2026-06-19T14:42:54Z",
  "summary": "bpf: Free reuseport cBPF prog after RCU grace period.",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Free reuseport cBPF prog after RCU grace period.\n\nEulgyu Kim reported the splat below with a repro. [0]\n\nThe repro sets up a UDP reuseport group with a cBPF prog and\nreplaces it with a new one while another thread is sending\na UDP packet to the group.\n\nThe reuseport prog is freed by sk_reuseport_prog_free().\nbpf_prog_put() is called for \"e\"BPF prog to destruct through\nmultiple stages while cBPF prog is freed immediately by\nbpf_release_orig_filter() and bpf_prog_free().\n\nIf a reuseport prog is detached from the setsockopt() path\n(reuseport_attach_prog() or reuseport_detach_prog()),\nsk_reuseport_prog_free() is called without waiting for RCU\nreaders to complete, resulting in various bugs.\n\nLet's defer freeing the reuseport cBPF prog after one RCU\ngrace period.\n\nNote \"e\"BPF prog is safe as is unless the fast path starts\nto touch fields destroyed in bpf_prog_put_deferred() and\n__bpf_prog_put_noref().\n\n[0]:\nBUG: KASAN: vmalloc-out-of-bounds in reuseport_select_sock+0xedc/0x1220 net/core/sock_reuseport.c:596\nRead of size 4 at addr ffffc9000051e004 by task slowme/10208\nCPU: 6 UID: 1000 PID: 10208 Comm: slowme Not tainted 7.0.0-geb7ac95ff75e #32 PREEMPT(full)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n <IRQ>\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n reuseport_select_sock+0xedc/0x1220 net/core/sock_reuseport.c:596\n udp4_lib_lookup2+0x3bc/0x950 net/ipv4/udp.c:495\n __udp4_lib_lookup+0x768/0xe20 net/ipv4/udp.c:723\n __udp4_lib_lookup_skb+0x297/0x390 net/ipv4/udp.c:752\n __udp4_lib_rcv+0x1312/0x2620 net/ipv4/udp.c:2752\n ip_protocol_deliver_rcu+0x282/0x440 net/ipv4/ip_input.c:207\n ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241\n NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318\n NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318\n __netif_receive_skb_one_core net/core/dev.c:6181 [inline]\n __netif_receive_skb net/core/dev.c:6294 [inline]\n process_backlog+0xaa4/0x1960 net/core/dev.c:6645\n __napi_poll+0xae/0x340 net/core/dev.c:7709\n napi_poll net/core/dev.c:7772 [inline]\n net_rx_action+0x5d7/0xf50 net/core/dev.c:7929\n handle_softirqs+0x22b/0x870 kernel/softirq.c:622\n do_softirq+0x76/0xd0 kernel/softirq.c:523\n </IRQ>\n <TASK>\n __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450\n local_bh_enable include/linux/bottom_half.h:33 [inline]\n rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]\n __dev_queue_xmit+0x1dd7/0x3710 net/core/dev.c:4890\n neigh_output include/net/neighbour.h:556 [inline]\n ip_finish_output2+0xca9/0x1070 net/ipv4/ip_output.c:237\n NF_HOOK_COND include/linux/netfilter.h:307 [inline]\n ip_output+0x29f/0x450 net/ipv4/ip_output.c:438\n ip_send_skb+0x45/0xc0 net/ipv4/ip_output.c:1508\n udp_send_skb+0xb04/0x1510 net/ipv4/udp.c:1195\n udp_sendmsg+0x1a71/0x2350 net/ipv4/udp.c:1485\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg net/socket.c:742 [inline]\n __sys_sendto+0x554/0x680 net/socket.c:2206\n __do_sys_sendto net/socket.c:2213 [inline]\n __se_sys_sendto net/socket.c:2209 [inline]\n __x64_sys_sendto+0xde/0x100 net/socket.c:2209\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x160/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x415a2d\nCode: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f6bc31e41e8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c\nRAX: ffffffffffffffda RBX: 00007f6bc31e4cdc RCX: 0000000000415a2d\nRDX: 0000000000000001 RSI: 00007f6bc31e421f RDI: 0000000000000003\nRBP: 00007f6bc31e4240 R08: 00007f6bc31e4220 R09: 0000000000000010\nR10: 0000000000000000 R11: \n---truncated---",
  "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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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-52910"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/08264d5bba0bdd3a79bc2984fee09286aba0c4eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fec41484e7c2aa7ded44c541bba98872be937754"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c3e3fddda6b5d9ba505d218b4055e7d8a282ac57"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f8b8f1d4bb76098e87b8269a0631019648330e6d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/298db6167f81e9c470a57cf652e4e47757b4293e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/87dfb977bdb6eaa47e9993a34e18f44970f88b1f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90e47dc5c572d1c73971ac51c7428803f42b78eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/18fc650ccd7fe3376eca89203668cfb8268f60df"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable attach/detach operation is reached through local `setsockopt()` on an `SO_REUSEPORT` socket with `SO_ATTACH_REUSEPORT_CBPF` or `SO_DETACH_REUSEPORT_BPF`. Although packet receive executes the stale program, the attacker-controlled trigger for freeing/replacing it is a local socket API path.\nAC:L - The race is attacker-controlled: a local attacker can create the UDP reuseport group, replace/detach the cBPF program, and concurrently send packets to drive `reuseport_select_sock()`. No rare external condition is required.\nPR:L - A basic unprivileged local user can create UDP sockets on an unprivileged port, set `SO_REUSEPORT`, and attach a classic reuseport BPF filter; this path does not require `CAP_NET_ADMIN`. User namespaces are not needed to make the path reachable.\nUI:N - No victim user action is required once the attacker runs the local reproducer. The attacker controls the sockets, the filter replacement, and the packet generation.\nS:U - The bug is a kernel memory lifetime error used for local kernel compromise or crash within the same host security authority. It does not cross a VM, IOMMU, or similar security boundary.\nC:H - This is a use-after-free of a `bpf_prog` object that is dereferenced after reclamation while selecting a reuseport socket. Per kernel CVSS guidance, UAFs are treated as enabling high confidentiality impact through potential kernel memory disclosure.\nI:H - The stale freed `bpf_prog` can be reused while the receive path reads and runs through the program object, making control-flow or data corruption plausible. Per kernel CVSS guidance, UAF memory corruption warrants high integrity impact.\nA:H - The reported reproducer triggers a KASAN vmalloc out-of-bounds/use-after-free splat in the packet receive path. Such kernel memory corruption can reliably crash or destabilize the kernel."
    }
  }
}