cve-2024-41041
Vulnerability from cvelistv5
Published
2024-07-29 14:31
Modified
2024-09-11 17:32
Severity
Summary
udp: Set SOCK_RCU_FREE earlier in udp_lib_get_port().
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20ceae10623c3b29fdf7609690849475bcdebdb0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c0b485a8c6116516f33925b9ce5b6104a6eadfd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a67c4e47626e6daccda62888f8b096abb5d3940
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f965684c57c3117cfd2f754dd3270383c529fba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6db0d3ea6536e7120871e5448b3032570152ec6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5fd77ca13d657c6e99bf04f0917445e6a80231e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ddf516e50bf8a7bc9b3bd8a9831f9c7a8131a32a
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: Set SOCK_RCU_FREE earlier in udp_lib_get_port().\n\nsyzkaller triggered the warning [0] in udp_v4_early_demux().\n\nIn udp_v[46]_early_demux() and sk_lookup(), we do not touch the refcount\nof the looked-up sk and use sock_pfree() as skb-\u003edestructor, so we check\nSOCK_RCU_FREE to ensure that the sk is safe to access during the RCU grace\nperiod.\n\nCurrently, SOCK_RCU_FREE is flagged for a bound socket after being put\ninto the hash table.  Moreover, the SOCK_RCU_FREE check is done too early\nin udp_v[46]_early_demux() and sk_lookup(), so there could be a small race\nwindow:\n\n  CPU1                                 CPU2\n  ----                                 ----\n  udp_v4_early_demux()                 udp_lib_get_port()\n  |                                    |- hlist_add_head_rcu()\n  |- sk = __udp4_lib_demux_lookup()    |\n  |- DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk));\n                                       `- sock_set_flag(sk, SOCK_RCU_FREE)\n\nWe had the same bug in TCP and fixed it in commit 871019b22d1b (\"net:\nset SOCK_RCU_FREE before inserting socket into hashtable\").\n\nLet\u0027s apply the same fix for UDP.\n\n[0]:\nWARNING: CPU: 0 PID: 11198 at net/ipv4/udp.c:2599 udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599\nModules linked in:\nCPU: 0 PID: 11198 Comm: syz-executor.1 Not tainted 6.9.0-g93bda33046e7 #13\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\nRIP: 0010:udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599\nCode: c5 7a 15 fe bb 01 00 00 00 44 89 e9 31 ff d3 e3 81 e3 bf ef ff ff 89 de e8 2c 74 15 fe 85 db 0f 85 02 06 00 00 e8 9f 7a 15 fe \u003c0f\u003e 0b e8 98 7a 15 fe 49 8d 7e 60 e8 4f 39 2f fe 49 c7 46 60 20 52\nRSP: 0018:ffffc9000ce3fa58 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8318c92c\nRDX: ffff888036ccde00 RSI: ffffffff8318c2f1 RDI: 0000000000000001\nRBP: ffff88805a2dd6e0 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: 0001ffffffffffff R12: ffff88805a2dd680\nR13: 0000000000000007 R14: ffff88800923f900 R15: ffff88805456004e\nFS:  00007fc449127640(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fc449126e38 CR3: 000000003de4b002 CR4: 0000000000770ef0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n ip_rcv_finish_core.constprop.0+0xbdd/0xd20 net/ipv4/ip_input.c:349\n ip_rcv_finish+0xda/0x150 net/ipv4/ip_input.c:447\n NF_HOOK include/linux/netfilter.h:314 [inline]\n NF_HOOK include/linux/netfilter.h:308 [inline]\n ip_rcv+0x16c/0x180 net/ipv4/ip_input.c:569\n __netif_receive_skb_one_core+0xb3/0xe0 net/core/dev.c:5624\n __netif_receive_skb+0x21/0xd0 net/core/dev.c:5738\n netif_receive_skb_internal net/core/dev.c:5824 [inline]\n netif_receive_skb+0x271/0x300 net/core/dev.c:5884\n tun_rx_batched drivers/net/tun.c:1549 [inline]\n tun_get_user+0x24db/0x2c50 drivers/net/tun.c:2002\n tun_chr_write_iter+0x107/0x1a0 drivers/net/tun.c:2048\n new_sync_write fs/read_write.c:497 [inline]\n vfs_write+0x76f/0x8d0 fs/read_write.c:590\n ksys_write+0xbf/0x190 fs/read_write.c:643\n __do_sys_write fs/read_write.c:655 [inline]\n __se_sys_write fs/read_write.c:652 [inline]\n __x64_sys_write+0x41/0x50 fs/read_write.c:652\n x64_sys_call+0xe66/0x1990 arch/x86/include/generated/asm/syscalls_64.h:2\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x4b/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\nRIP: 0033:0x7fc44a68bc1f\nCode: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 e9 cf f5 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 3c d0 f5 ff 48\nRSP: 002b:00007fc449126c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 00000000004bc050 RCX: 00007fc44a68bc1f\nR\n---truncated---"
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-41041",
    "datePublished": "2024-07-29T14:31:54.647Z",
    "dateReserved": "2024-07-12T12:17:45.623Z",
    "dateUpdated": "2024-09-11T17:32:58.050Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-41041\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-29T15:15:12.563\",\"lastModified\":\"2024-07-29T16:21:52.517\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nudp: Set SOCK_RCU_FREE earlier in udp_lib_get_port().\\n\\nsyzkaller triggered the warning [0] in udp_v4_early_demux().\\n\\nIn udp_v[46]_early_demux() and sk_lookup(), we do not touch the refcount\\nof the looked-up sk and use sock_pfree() as skb-\u003edestructor, so we check\\nSOCK_RCU_FREE to ensure that the sk is safe to access during the RCU grace\\nperiod.\\n\\nCurrently, SOCK_RCU_FREE is flagged for a bound socket after being put\\ninto the hash table.  Moreover, the SOCK_RCU_FREE check is done too early\\nin udp_v[46]_early_demux() and sk_lookup(), so there could be a small race\\nwindow:\\n\\n  CPU1                                 CPU2\\n  ----                                 ----\\n  udp_v4_early_demux()                 udp_lib_get_port()\\n  |                                    |- hlist_add_head_rcu()\\n  |- sk = __udp4_lib_demux_lookup()    |\\n  |- DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk));\\n                                       `- sock_set_flag(sk, SOCK_RCU_FREE)\\n\\nWe had the same bug in TCP and fixed it in commit 871019b22d1b (\\\"net:\\nset SOCK_RCU_FREE before inserting socket into hashtable\\\").\\n\\nLet\u0027s apply the same fix for UDP.\\n\\n[0]:\\nWARNING: CPU: 0 PID: 11198 at net/ipv4/udp.c:2599 udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599\\nModules linked in:\\nCPU: 0 PID: 11198 Comm: syz-executor.1 Not tainted 6.9.0-g93bda33046e7 #13\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\\nRIP: 0010:udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599\\nCode: c5 7a 15 fe bb 01 00 00 00 44 89 e9 31 ff d3 e3 81 e3 bf ef ff ff 89 de e8 2c 74 15 fe 85 db 0f 85 02 06 00 00 e8 9f 7a 15 fe \u003c0f\u003e 0b e8 98 7a 15 fe 49 8d 7e 60 e8 4f 39 2f fe 49 c7 46 60 20 52\\nRSP: 0018:ffffc9000ce3fa58 EFLAGS: 00010293\\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8318c92c\\nRDX: ffff888036ccde00 RSI: ffffffff8318c2f1 RDI: 0000000000000001\\nRBP: ffff88805a2dd6e0 R08: 0000000000000001 R09: 0000000000000000\\nR10: 0000000000000000 R11: 0001ffffffffffff R12: ffff88805a2dd680\\nR13: 0000000000000007 R14: ffff88800923f900 R15: ffff88805456004e\\nFS:  00007fc449127640(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007fc449126e38 CR3: 000000003de4b002 CR4: 0000000000770ef0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600\\nPKRU: 55555554\\nCall Trace:\\n \u003cTASK\u003e\\n ip_rcv_finish_core.constprop.0+0xbdd/0xd20 net/ipv4/ip_input.c:349\\n ip_rcv_finish+0xda/0x150 net/ipv4/ip_input.c:447\\n NF_HOOK include/linux/netfilter.h:314 [inline]\\n NF_HOOK include/linux/netfilter.h:308 [inline]\\n ip_rcv+0x16c/0x180 net/ipv4/ip_input.c:569\\n __netif_receive_skb_one_core+0xb3/0xe0 net/core/dev.c:5624\\n __netif_receive_skb+0x21/0xd0 net/core/dev.c:5738\\n netif_receive_skb_internal net/core/dev.c:5824 [inline]\\n netif_receive_skb+0x271/0x300 net/core/dev.c:5884\\n tun_rx_batched drivers/net/tun.c:1549 [inline]\\n tun_get_user+0x24db/0x2c50 drivers/net/tun.c:2002\\n tun_chr_write_iter+0x107/0x1a0 drivers/net/tun.c:2048\\n new_sync_write fs/read_write.c:497 [inline]\\n vfs_write+0x76f/0x8d0 fs/read_write.c:590\\n ksys_write+0xbf/0x190 fs/read_write.c:643\\n __do_sys_write fs/read_write.c:655 [inline]\\n __se_sys_write fs/read_write.c:652 [inline]\\n __x64_sys_write+0x41/0x50 fs/read_write.c:652\\n x64_sys_call+0xe66/0x1990 arch/x86/include/generated/asm/syscalls_64.h:2\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0x4b/0x110 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\\nRIP: 0033:0x7fc44a68bc1f\\nCode: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 e9 cf f5 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 3c d0 f5 ff 48\\nRSP: 002b:00007fc449126c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001\\nRAX: ffffffffffffffda RBX: 00000000004bc050 RCX: 00007fc44a68bc1f\\nR\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/20ceae10623c3b29fdf7609690849475bcdebdb0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c0b485a8c6116516f33925b9ce5b6104a6eadfd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7a67c4e47626e6daccda62888f8b096abb5d3940\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f965684c57c3117cfd2f754dd3270383c529fba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6db0d3ea6536e7120871e5448b3032570152ec6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5fd77ca13d657c6e99bf04f0917445e6a80231e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddf516e50bf8a7bc9b3bd8a9831f9c7a8131a32a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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