{"id":66644,"date":"2026-06-28T03:37:37","date_gmt":"2026-06-28T03:37:37","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=66644"},"modified":"2026-06-28T03:37:37","modified_gmt":"2026-06-28T03:37:37","slug":"bpf-free-reuseport-cbpf-prog-after-rcu-grace-period","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=66644","title":{"rendered":"bpf: Free reuseport cBPF prog after RCU grace period._CVE-2026-52910"},"content":{"rendered":"

{“lastseen”:””,”description”:”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 \\u003cIRQ\\u003e\\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 \\u003c\/IRQ\\u003e\\n \\u003cTASK\\u003e\\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 \\u003c48\\u003e 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—“,”published”:”2026-06-19T14:43:33.952Z”,”modified”:”2026-06-28T06:36:27.818Z”,”type”:”cve”,”title”:”bpf: Free reuseport cBPF prog after RCU grace period.”,”source”:”Linux”,”references”:”https:\/\/git.kernel.org\/stable\/c\/08264d5bba0bdd3a79bc2984fee09286aba0c4eb\\nhttps:\/\/git.kernel.org\/stable\/c\/fec41484e7c2aa7ded44c541bba98872be937754\\nhttps:\/\/git.kernel.org\/stable\/c\/c3e3fddda6b5d9ba505d218b4055e7d8a282ac57\\nhttps:\/\/git.kernel.org\/stable\/c\/f8b8f1d4bb76098e87b8269a0631019648330e6d\\nhttps:\/\/git.kernel.org\/stable\/c\/298db6167f81e9c470a57cf652e4e47757b4293e\\nhttps:\/\/git.kernel.org\/stable\/c\/87dfb977bdb6eaa47e9993a34e18f44970f88b1f\\nhttps:\/\/git.kernel.org\/stable\/c\/90e47dc5c572d1c73971ac51c7428803f42b78eb\\nhttps:\/\/git.kernel.org\/stable\/c\/18fc650ccd7fe3376eca89203668cfb8268f60df”,”id”:”CVE-2026-52910″,”bulletinFamily”:””,”cwe”:null,”cvelist”:null,”sourceData”:”Linux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13\\nLinux Linux 4.5″,”sourceHref”:””,”cvss”:{“score”:7.8,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:H\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”Linux”,”version”:”538950a1b7527a0a52ccd9337e3fcd304f027f13″,”vendor”:”Linux”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"

{“lastseen”:””,”description”:”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…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,28,12,15,13,7,11,5],"class_list":["post-66644","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-78","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\nbpf: Free reuseport cBPF prog after RCU grace period._CVE-2026-52910 - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=66644\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"bpf: Free reuseport cBPF prog after RCU grace period._CVE-2026-52910 - 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