{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-36904", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-30T15:25:07.067Z", "datePublished": "2024-05-30T15:29:05.457Z", "dateUpdated": "2026-08-05T11:31:55.416Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:55.416Z" }, "descriptions": [ { "lang": "en", "value": "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 <0f> 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 \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 <48> 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 " } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code in `tcp_twsk_unique()` is only reached from the outbound `connect(2)` path (`tcp_v4_connect` → `__inet_hash_connect` → `__inet_check_established`), which a remote peer cannot invoke; a local socket must initiate the connection. Both sides of the race are driven by local syscalls (close() generating TIME-WAIT, connect() reusing the 4-tuple), fully exercisable over loopback.\nAC:L - The attacker creates and controls both sides of the race — one set of threads generates TIME-WAIT sockets via active close, another loops on bind()+connect() against the same 4-tuple — and can retry indefinitely at thousands of attempts per second, as demonstrated by the reporter's working `trigger` reproducer. No non-default sysctl is required, since the explicitly-bound `twp == NULL` path bypasses the `tcp_tw_reuse` check entirely.\nPR:L - Only an unprivileged local user account is needed: creating TCP sockets, bind() with SO_REUSEADDR, connect(), and close() require no capabilities, and the whole sequence works inside a network namespace or on loopback.\nUI:N - The attacker performs every step itself with its own sockets; no victim action or interaction of any kind is needed.\nS:U - The corruption is confined to kernel slab memory managed by the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The refcount underflow prematurely frees a `tcp_timewait_sock` that is still referenced by the ehash/bhash chains and the connect path; on a SLAB_TYPESAFE_BY_RCU slab the attacker reallocates that memory with sprayed TIME-WAIT sockets, yielding a use-after-free read primitive over kernel memory and adjacent socket state.\nI:H - The stale pointers permit writes through the dangling object — hlist_nulls chain pointer updates, timer re-arming, and `inet_twsk_kill()` refcount decrements applied to reallocated objects — cascading into refcount corruption of unrelated `struct sock` allocations, a well-established path to arbitrary write and control-flow hijack.\nA:H - Even the benign outcome is a `refcount_t` WARN (an immediate panic under the widely used panic_on_warn), and the underflow reliably frees a live socket, causing kernel oops/panic from list-corruption and freed-memory dereference in the TCP hash tables." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/tcp_ipv4.c" ], "versions": [ { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "84546cc1aeeb4df3e444b18a4293c9823f974be9", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "1796ca9c6f5bd50554214053af5f47d112818ee3", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "1d9cf07810c30ef7948879567d10fd1f01121d34", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "27b0284d8be182a81feb65581ab6a724dfd596e8", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "13ed7cdf079686ccd3618335205700c03f6fb446", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "6e48faad92be13166184d21506e4e54c79c13adc", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "517e32ea0a8c72202d0d8aa8df50a7cd3d6fdefc", "status": "affected", "versionType": "git" }, { "version": "ec94c2696f0bcd5ae92a553244e4ac30d2171a2d", "lessThan": "f2db7230f73a80dbb179deab78f88a7947f0ab7e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/tcp_ipv4.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.314", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.276", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.217", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.159", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.91", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.31", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.10", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "4.19.314" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.4.276" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.10.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.8.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/84546cc1aeeb4df3e444b18a4293c9823f974be9" }, { "url": "https://git.kernel.org/stable/c/1796ca9c6f5bd50554214053af5f47d112818ee3" }, { "url": "https://git.kernel.org/stable/c/1d9cf07810c30ef7948879567d10fd1f01121d34" }, { "url": "https://git.kernel.org/stable/c/27b0284d8be182a81feb65581ab6a724dfd596e8" }, { "url": "https://git.kernel.org/stable/c/13ed7cdf079686ccd3618335205700c03f6fb446" }, { "url": "https://git.kernel.org/stable/c/6e48faad92be13166184d21506e4e54c79c13adc" }, { "url": "https://git.kernel.org/stable/c/517e32ea0a8c72202d0d8aa8df50a7cd3d6fdefc" }, { "url": "https://git.kernel.org/stable/c/f2db7230f73a80dbb179deab78f88a7947f0ab7e" } ], "title": "tcp: Use refcount_inc_not_zero() in tcp_twsk_unique().", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-12T19:20:22.181493Z", "id": "CVE-2024-36904", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-12T19:20:38.310Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/84546cc1aeeb4df3e444b18a4293c9823f974be9", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1796ca9c6f5bd50554214053af5f47d112818ee3", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1d9cf07810c30ef7948879567d10fd1f01121d34", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/27b0284d8be182a81feb65581ab6a724dfd596e8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/13ed7cdf079686ccd3618335205700c03f6fb446", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6e48faad92be13166184d21506e4e54c79c13adc", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/517e32ea0a8c72202d0d8aa8df50a7cd3d6fdefc", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/f2db7230f73a80dbb179deab78f88a7947f0ab7e", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html", "tags": [ "x_transferred" ] }, { "url": "https://security.netapp.com/advisory/ntap-20240905-0004/" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-09-05T08:03:30.442Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T11:54:07.539Z" }, "affected": [ { "vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "unaffected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html" } ] } ] }, "dataVersion": "5.2" }