{"id":"CVE-2024-36904","summary":"tcp: Use refcount_inc_not_zero() in tcp_twsk_unique().","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Use refcount_inc_not_zero() in tcp_twsk_unique().\n\nAnderson Nascimento reported a use-after-free splat in tcp_twsk_unique()\nwith nice analysis.\n\nSince commit ec94c2696f0b (\"tcp/dccp: avoid one atomic operation for\ntimewait hashdance\"), inet_twsk_hashdance() sets TIME-WAIT socket's\nsk_refcnt after putting it into ehash and releasing the bucket lock.\n\nThus, there is a small race window where other threads could try to\nreuse the port during connect() and call sock_hold() in tcp_twsk_unique()\nfor the TIME-WAIT socket with zero refcnt.\n\nIf that happens, the refcnt taken by tcp_twsk_unique() is overwritten\nand sock_put() will cause underflow, triggering a real use-after-free\nsomewhere else.\n\nTo avoid the use-after-free, we need to use refcount_inc_not_zero() in\ntcp_twsk_unique() and give up on reusing the port if it returns false.\n\n[0]:\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 0 PID: 1039313 at lib/refcount.c:25 refcount_warn_saturate+0xe5/0x110\nCPU: 0 PID: 1039313 Comm: trigger Not tainted 6.8.6-200.fc39.x86_64 #1\nHardware name: VMware, Inc. VMware20,1/440BX Desktop Reference Platform, BIOS VMW201.00V.21805430.B64.2305221830 05/22/2023\nRIP: 0010:refcount_warn_saturate+0xe5/0x110\nCode: 42 8e ff 0f 0b c3 cc cc cc cc 80 3d aa 13 ea 01 00 0f 85 5e ff ff ff 48 c7 c7 f8 8e b7 82 c6 05 96 13 ea 01 01 e8 7b 42 8e ff \u003c0f\u003e 0b c3 cc cc cc cc 48 c7 c7 50 8f b7 82 c6 05 7a 13 ea 01 01 e8\nRSP: 0018:ffffc90006b43b60 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: ffff888009bb3ef0 RCX: 0000000000000027\nRDX: ffff88807be218c8 RSI: 0000000000000001 RDI: ffff88807be218c0\nRBP: 0000000000069d70 R08: 0000000000000000 R09: ffffc90006b439f0\nR10: ffffc90006b439e8 R11: 0000000000000003 R12: ffff8880029ede84\nR13: 0000000000004e20 R14: ffffffff84356dc0 R15: ffff888009bb3ef0\nFS:  00007f62c10926c0(0000) GS:ffff88807be00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020ccb000 CR3: 000000004628c005 CR4: 0000000000f70ef0\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n ? refcount_warn_saturate+0xe5/0x110\n ? __warn+0x81/0x130\n ? refcount_warn_saturate+0xe5/0x110\n ? report_bug+0x171/0x1a0\n ? refcount_warn_saturate+0xe5/0x110\n ? handle_bug+0x3c/0x80\n ? exc_invalid_op+0x17/0x70\n ? asm_exc_invalid_op+0x1a/0x20\n ? refcount_warn_saturate+0xe5/0x110\n tcp_twsk_unique+0x186/0x190\n __inet_check_established+0x176/0x2d0\n __inet_hash_connect+0x74/0x7d0\n ? __pfx___inet_check_established+0x10/0x10\n tcp_v4_connect+0x278/0x530\n __inet_stream_connect+0x10f/0x3d0\n inet_stream_connect+0x3a/0x60\n __sys_connect+0xa8/0xd0\n __x64_sys_connect+0x18/0x20\n do_syscall_64+0x83/0x170\n entry_SYSCALL_64_after_hwframe+0x78/0x80\nRIP: 0033:0x7f62c11a885d\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 8b 0d a3 45 0c 00 f7 d8 64 89 01 48\nRSP: 002b:00007f62c1091e58 EFLAGS: 00000296 ORIG_RAX: 000000000000002a\nRAX: ffffffffffffffda RBX: 0000000020ccb004 RCX: 00007f62c11a885d\nRDX: 0000000000000010 RSI: 0000000020ccb000 RDI: 0000000000000003\nRBP: 00007f62c1091e90 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000296 R12: 00007f62c10926c0\nR13: ffffffffffffff88 R14: 0000000000000000 R15: 00007ffe237885b0\n \u003c/TASK\u003e","modified":"2026-04-16T00:00:49.839265081Z","published":"2024-05-30T15:29:05.457Z","related":["ALSA-2024:4583","ALSA-2024:5102","SUSE-SU-2024:2362-1","SUSE-SU-2024:2365-1","SUSE-SU-2024:2372-1","SUSE-SU-2024:2384-1","SUSE-SU-2024:2385-1","SUSE-SU-2024:2394-1","SUSE-SU-2024:2495-1","SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2939-1","SUSE-SU-2024:2973-1","SUSE-SU-2024:4120-1","SUSE-SU-2024:4122-1","SUSE-SU-2024:4123-1","SUSE-SU-2024:4124-1","SUSE-SU-2024:4125-1","SUSE-SU-2024:4127-1","SUSE-SU-2024:4129-1","SUSE-SU-2024:4141-1","SUSE-SU-2024:4177-1","SUSE-SU-2024:4179-1","SUSE-SU-2024:4180-1","SUSE-SU-2024:4206-1","SUSE-SU-2024:4207-1","SUSE-SU-2024:4208-1","SUSE-SU-2024:4214-1","SUSE-SU-2024:4216-1","SUSE-SU-2024:4217-1","SUSE-SU-2024:4218-1","SUSE-SU-2024:4220-1","SUSE-SU-2024:4227-1","SUSE-SU-2024:4228-1","SUSE-SU-2024:4230-1","SUSE-SU-2024:4231-1","SUSE-SU-2024:4234-1","SUSE-SU-2024:4235-1","SUSE-SU-2024:4236-1","SUSE-SU-2024:4241-1","SUSE-SU-2024:4242-1","SUSE-SU-2024:4243-1","SUSE-SU-2024:4246-1","SUSE-SU-2024:4250-1","SUSE-SU-2024:4256-1","SUSE-SU-2024:4263-1","SUSE-SU-2024:4264-1","SUSE-SU-2024:4265-1","SUSE-SU-2024:4266-1","SUSE-SU-2024:4275-1","SUSE-SU-2024:4276-1","SUSE-SU-2025:0101-1","SUSE-SU-2025:0106-1","SUSE-SU-2025:0107-1","SUSE-SU-2025:0109-1","SUSE-SU-2025:0110-1","SUSE-SU-2025:0114-1","SUSE-SU-2025:0115-1","SUSE-SU-2025:0124-1","SUSE-SU-2025:0131-1","SUSE-SU-2025:0137-1","SUSE-SU-2025:0138-1","SUSE-SU-2025:0146-1","SUSE-SU-2025:0150-1","SUSE-SU-2025:0158-1","SUSE-SU-2025:0164-1","SUSE-SU-2025:0187-1","SUSE-SU-2025:0238-1","SUSE-SU-2025:0239-1","SUSE-SU-2025:0240-1","SUSE-SU-2025:0244-1","SUSE-SU-2025:0248-1","SUSE-SU-2025:0249-1","SUSE-SU-2025:0251-1","SUSE-SU-2025:0252-1","SUSE-SU-2025:0253-1","SUSE-SU-2025:0254-1","SUSE-SU-2025:0255-1","SUSE-SU-2025:0260-1","SUSE-SU-2025:0261-1","SUSE-SU-2025:0264-1","SUSE-SU-2025:0266-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/36xxx/CVE-2024-36904.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13ed7cdf079686ccd3618335205700c03f6fb446"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1796ca9c6f5bd50554214053af5f47d112818ee3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1d9cf07810c30ef7948879567d10fd1f01121d34"},{"type":"WEB","url":"https://git.kernel.org/stable/c/27b0284d8be182a81feb65581ab6a724dfd596e8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/517e32ea0a8c72202d0d8aa8df50a7cd3d6fdefc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e48faad92be13166184d21506e4e54c79c13adc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84546cc1aeeb4df3e444b18a4293c9823f974be9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f2db7230f73a80dbb179deab78f88a7947f0ab7e"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/36xxx/CVE-2024-36904.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-36904"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240905-0004/"},{"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":"ec94c2696f0bcd5ae92a553244e4ac30d2171a2d"},{"fixed":"84546cc1aeeb4df3e444b18a4293c9823f974be9"},{"fixed":"1796ca9c6f5bd50554214053af5f47d112818ee3"},{"fixed":"1d9cf07810c30ef7948879567d10fd1f01121d34"},{"fixed":"27b0284d8be182a81feb65581ab6a724dfd596e8"},{"fixed":"13ed7cdf079686ccd3618335205700c03f6fb446"},{"fixed":"6e48faad92be13166184d21506e4e54c79c13adc"},{"fixed":"517e32ea0a8c72202d0d8aa8df50a7cd3d6fdefc"},{"fixed":"f2db7230f73a80dbb179deab78f88a7947f0ab7e"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-36904.json"}}],"schema_version":"1.7.5"}