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CVE-2024-44935 (GCVE-0-2024-44935)

Vulnerability from cvelistv5 – Published: 2024-08-26 10:11 – Updated: 2026-05-12 11:57
VLAI
Title
sctp: Fix null-ptr-deref in reuseport_add_sock().
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: Fix null-ptr-deref in reuseport_add_sock(). syzbot reported a null-ptr-deref while accessing sk2->sk_reuseport_cb in reuseport_add_sock(). [0] The repro first creates a listener with SO_REUSEPORT. Then, it creates another listener on the same port and concurrently closes the first listener. The second listen() calls reuseport_add_sock() with the first listener as sk2, where sk2->sk_reuseport_cb is not expected to be cleared concurrently, but the close() does clear it by reuseport_detach_sock(). The problem is SCTP does not properly synchronise reuseport_alloc(), reuseport_add_sock(), and reuseport_detach_sock(). The caller of reuseport_alloc() and reuseport_{add,detach}_sock() must provide synchronisation for sockets that are classified into the same reuseport group. Otherwise, such sockets form multiple identical reuseport groups, and all groups except one would be silently dead. 1. Two sockets call listen() concurrently 2. No socket in the same group found in sctp_ep_hashtable[] 3. Two sockets call reuseport_alloc() and form two reuseport groups 4. Only one group hit first in __sctp_rcv_lookup_endpoint() receives incoming packets Also, the reported null-ptr-deref could occur. TCP/UDP guarantees that would not happen by holding the hash bucket lock. Let's apply the locking strategy to __sctp_hash_endpoint() and __sctp_unhash_endpoint(). [0]: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 UID: 0 PID: 10230 Comm: syz-executor119 Not tainted 6.10.0-syzkaller-12585-g301927d2d2eb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:reuseport_add_sock+0x27e/0x5e0 net/core/sock_reuseport.c:350 Code: 00 0f b7 5d 00 bf 01 00 00 00 89 de e8 1b a4 ff f7 83 fb 01 0f 85 a3 01 00 00 e8 6d a0 ff f7 49 8d 7e 12 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4b 02 00 00 41 0f b7 5e 12 49 8d 7e 14 RSP: 0018:ffffc9000b947c98 EFLAGS: 00010202 RAX: 0000000000000002 RBX: ffff8880252ddf98 RCX: ffff888079478000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000012 RBP: 0000000000000001 R08: ffffffff8993e18d R09: 1ffffffff1fef385 R10: dffffc0000000000 R11: fffffbfff1fef386 R12: ffff8880252ddac0 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f24e45b96c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcced5f7b8 CR3: 00000000241be000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __sctp_hash_endpoint net/sctp/input.c:762 [inline] sctp_hash_endpoint+0x52a/0x600 net/sctp/input.c:790 sctp_listen_start net/sctp/socket.c:8570 [inline] sctp_inet_listen+0x767/0xa20 net/sctp/socket.c:8625 __sys_listen_socket net/socket.c:1883 [inline] __sys_listen+0x1b7/0x230 net/socket.c:1894 __do_sys_listen net/socket.c:1902 [inline] __se_sys_listen net/socket.c:1900 [inline] __x64_sys_listen+0x5a/0x70 net/socket.c:1900 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f24e46039b9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f24e45b9228 EFLAGS: 00000246 ORIG_RAX: 0000000000000032 RAX: ffffffffffffffda RBX: 00007f24e468e428 RCX: 00007f24e46039b9 RDX: 00007f24e46039b9 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007f24e468e420 R08: 00007f24e45b96c0 R09: 00007f24e45b96c0 R10: 00007f24e45b96c0 R11: 0000000000000246 R12: 00007f24e468e42c R13: ---truncated---
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:27 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < c9b3fc4f157867e858734e31022ebee8a24f0de7 (git)
Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < 52319d9d2f522ed939af31af70f8c3a0f0f67e6c (git)
Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < 54b303d8f9702b8ab618c5032fae886b16356928 (git)
Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < 05e4a0fa248240efd99a539853e844f0f0a9e6a5 (git)
Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < 1407be30fc17eff918a98e0a990c0e988f11dc84 (git)
Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < e809a84c802377ef61525a298a1ec1728759b913 (git)
Affected: 6ba84574026792ce33a40c7da721dea36d0f3973 , < 9ab0faa7f9ffe31296dbb9bbe6f76c72c14eea18 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.105 , ≤ 6.1.* (semver)
Unaffected: 6.6.46 , ≤ 6.6.* (semver)
Unaffected: 6.10.5 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.1 (custom)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Unaffected: 0 , < * (custom)
guessed Create a notification for this product.
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
guessed Create a notification for this product.
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.1 (custom)
guessed Create a notification for this product.
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Unaffected: 0 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: Fix null-ptr-deref in reuseport_add_sock().\n\nsyzbot reported a null-ptr-deref while accessing sk2-\u003esk_reuseport_cb in\nreuseport_add_sock(). [0]\n\nThe repro first creates a listener with SO_REUSEPORT.  Then, it creates\nanother listener on the same port and concurrently closes the first\nlistener.\n\nThe second listen() calls reuseport_add_sock() with the first listener as\nsk2, where sk2-\u003esk_reuseport_cb is not expected to be cleared concurrently,\nbut the close() does clear it by reuseport_detach_sock().\n\nThe problem is SCTP does not properly synchronise reuseport_alloc(),\nreuseport_add_sock(), and reuseport_detach_sock().\n\nThe caller of reuseport_alloc() and reuseport_{add,detach}_sock() must\nprovide synchronisation for sockets that are classified into the same\nreuseport group.\n\nOtherwise, such sockets form multiple identical reuseport groups, and\nall groups except one would be silently dead.\n\n  1. Two sockets call listen() concurrently\n  2. No socket in the same group found in sctp_ep_hashtable[]\n  3. Two sockets call reuseport_alloc() and form two reuseport groups\n  4. Only one group hit first in __sctp_rcv_lookup_endpoint() receives\n      incoming packets\n\nAlso, the reported null-ptr-deref could occur.\n\nTCP/UDP guarantees that would not happen by holding the hash bucket lock.\n\nLet\u0027s apply the locking strategy to __sctp_hash_endpoint() and\n__sctp_unhash_endpoint().\n\n[0]:\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\nCPU: 1 UID: 0 PID: 10230 Comm: syz-executor119 Not tainted 6.10.0-syzkaller-12585-g301927d2d2eb #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024\nRIP: 0010:reuseport_add_sock+0x27e/0x5e0 net/core/sock_reuseport.c:350\nCode: 00 0f b7 5d 00 bf 01 00 00 00 89 de e8 1b a4 ff f7 83 fb 01 0f 85 a3 01 00 00 e8 6d a0 ff f7 49 8d 7e 12 48 89 f8 48 c1 e8 03 \u003c42\u003e 0f b6 04 28 84 c0 0f 85 4b 02 00 00 41 0f b7 5e 12 49 8d 7e 14\nRSP: 0018:ffffc9000b947c98 EFLAGS: 00010202\nRAX: 0000000000000002 RBX: ffff8880252ddf98 RCX: ffff888079478000\nRDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000012\nRBP: 0000000000000001 R08: ffffffff8993e18d R09: 1ffffffff1fef385\nR10: dffffc0000000000 R11: fffffbfff1fef386 R12: ffff8880252ddac0\nR13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000\nFS:  00007f24e45b96c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffcced5f7b8 CR3: 00000000241be000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n __sctp_hash_endpoint net/sctp/input.c:762 [inline]\n sctp_hash_endpoint+0x52a/0x600 net/sctp/input.c:790\n sctp_listen_start net/sctp/socket.c:8570 [inline]\n sctp_inet_listen+0x767/0xa20 net/sctp/socket.c:8625\n __sys_listen_socket net/socket.c:1883 [inline]\n __sys_listen+0x1b7/0x230 net/socket.c:1894\n __do_sys_listen net/socket.c:1902 [inline]\n __se_sys_listen net/socket.c:1900 [inline]\n __x64_sys_listen+0x5a/0x70 net/socket.c:1900\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f24e46039b9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f24e45b9228 EFLAGS: 00000246 ORIG_RAX: 0000000000000032\nRAX: ffffffffffffffda RBX: 00007f24e468e428 RCX: 00007f24e46039b9\nRDX: 00007f24e46039b9 RSI: 0000000000000003 RDI: 0000000000000004\nRBP: 00007f24e468e420 R08: 00007f24e45b96c0 R09: 00007f24e45b96c0\nR10: 00007f24e45b96c0 R11: 0000000000000246 R12: 00007f24e468e42c\nR13:\n---truncated---"
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      "title": "sctp: Fix null-ptr-deref in reuseport_add_sock().",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-44935",
    "datePublished": "2024-08-26T10:11:27.384Z",
    "dateReserved": "2024-08-21T05:34:56.664Z",
    "dateUpdated": "2026-05-12T11:57:14.607Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "cve": "CVE-2024-44935",
      "date": "2026-09-20",
      "epss": "0.00227",
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    "microsoft_vex": {
      "current_release_date": "2026-02-18T15:15:37.000Z",
      "cve": "CVE-2024-44935",
      "id": "msrc_CVE-2024-44935",
      "initial_release_date": "2024-08-02T00:00:00.000Z",
      "product_status:fixed": "3",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sctp: Fix null-ptr-deref in reuseport_add_sock().",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-44935.json",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: Fix null-ptr-deref in reuseport_add_sock().\n\nsyzbot reported a null-ptr-deref while accessing sk2-\u003esk_reuseport_cb in\nreuseport_add_sock(). [0]\n\nThe repro first creates a listener with SO_REUSEPORT.  Then, it creates\nanother listener on the same port and concurrently closes the first\nlistener.\n\nThe second listen() calls reuseport_add_sock() with the first listener as\nsk2, where sk2-\u003esk_reuseport_cb is not expected to be cleared concurrently,\nbut the close() does clear it by reuseport_detach_sock().\n\nThe problem is SCTP does not properly synchronise reuseport_alloc(),\nreuseport_add_sock(), and reuseport_detach_sock().\n\nThe caller of reuseport_alloc() and reuseport_{add,detach}_sock() must\nprovide synchronisation for sockets that are classified into the same\nreuseport group.\n\nOtherwise, such sockets form multiple identical reuseport groups, and\nall groups except one would be silently dead.\n\n  1. Two sockets call listen() concurrently\n  2. No socket in the same group found in sctp_ep_hashtable[]\n  3. Two sockets call reuseport_alloc() and form two reuseport groups\n  4. Only one group hit first in __sctp_rcv_lookup_endpoint() receives\n      incoming packets\n\nAlso, the reported null-ptr-deref could occur.\n\nTCP/UDP guarantees that would not happen by holding the hash bucket lock.\n\nLet\u0027s apply the locking strategy to __sctp_hash_endpoint() and\n__sctp_unhash_endpoint().\n\n[0]:\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\nCPU: 1 UID: 0 PID: 10230 Comm: syz-executor119 Not tainted 6.10.0-syzkaller-12585-g301927d2d2eb #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024\nRIP: 0010:reuseport_add_sock+0x27e/0x5e0 net/core/sock_reuseport.c:350\nCode: 00 0f b7 5d 00 bf 01 00 00 00 89 de e8 1b a4 ff f7 83 fb 01 0f 85 a3 01 00 00 e8 6d a0 ff f7 49 8d 7e 12 48 89 f8 48 c1 e8 03 \u003c42\u003e 0f b6 04 28 84 c0 0f 85 4b 02 00 00 41 0f b7 5e 12 49 8d 7e 14\nRSP: 0018:ffffc9000b947c98 EFLAGS: 00010202\nRAX: 0000000000000002 RBX: ffff8880252ddf98 RCX: ffff888079478000\nRDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000012\nRBP: 0000000000000001 R08: ffffffff8993e18d R09: 1ffffffff1fef385\nR10: dffffc0000000000 R11: fffffbfff1fef386 R12: ffff8880252ddac0\nR13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000\nFS:  00007f24e45b96c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffcced5f7b8 CR3: 00000000241be000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n __sctp_hash_endpoint net/sctp/input.c:762 [inline]\n sctp_hash_endpoint+0x52a/0x600 net/sctp/input.c:790\n sctp_listen_start net/sctp/socket.c:8570 [inline]\n sctp_inet_listen+0x767/0xa20 net/sctp/socket.c:8625\n __sys_listen_socket net/socket.c:1883 [inline]\n __sys_listen+0x1b7/0x230 net/socket.c:1894\n __do_sys_listen net/socket.c:1902 [inline]\n __se_sys_listen net/socket.c:1900 [inline]\n __x64_sys_listen+0x5a/0x70 net/socket.c:1900\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f24e46039b9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f24e45b9228 EFLAGS: 00000246 ORIG_RAX: 0000000000000032\nRAX: ffffffffffffffda RBX: 00007f24e468e428 RCX: 00007f24e46039b9\nRDX: 00007f24e46039b9 RSI: 0000000000000003 RDI: 0000000000000004\nRBP: 00007f24e468e420 R08: 00007f24e45b96c0 R09: 00007f24e45b96c0\nR10: 00007f24e45b96c0 R11: 0000000000000246 R12: 00007f24e468e42c\nR13:\n---truncated---"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: sctp: corrige null-ptr-deref en reuseport_add_sock(). syzbot inform\u00f3 un null-ptr-deref al acceder a sk2-\u0026gt;sk_reuseport_cb en reuseport_add_sock(). [0] La reproducci\u00f3n primero crea un oyente con SO_REUSEPORT. Luego, crea otro oyente en el mismo puerto y al mismo tiempo cierra el primer oyente. El segundo listen() llama a reuseport_add_sock() con el primer oyente como sk2, donde no se espera que sk2-\u0026gt;sk_reuseport_cb se borre al mismo tiempo, pero close() lo borra mediante reuseport_detach_sock(). El problema es que SCTP no sincroniza correctamente reuseport_alloc(), reuseport_add_sock() y reuseport_detach_sock(). La persona que llama a reuseport_alloc() y reuseport_{add,detach}_sock() debe proporcionar sincronizaci\u00f3n para los sockets que est\u00e1n clasificados en el mismo grupo de reuseport. De lo contrario, dichos sockets forman m\u00faltiples grupos de reutilizaci\u00f3n id\u00e9nticos y todos los grupos excepto uno quedar\u00edan silenciosamente muertos. 1. Dos sockets llaman a listening() simult\u00e1neamente 2. No se encuentra ning\u00fan socket en el mismo grupo en sctp_ep_hashtable[] 3. Dos sockets llaman a reuseport_alloc() y forman dos grupos de reuseport 4. Solo un grupo que llega primero en __sctp_rcv_lookup_endpoint() recibe paquetes entrantes tambi\u00e9n, podr\u00eda producirse el null-ptr-deref informado. TCP/UDP garantiza que eso no suceder\u00e1 si se mantiene el bloqueo del dep\u00f3sito hash. Apliquemos la estrategia de bloqueo a __sctp_hash_endpoint() y __sctp_unhash_endpoint(). [0]: Vaya: fallo de protecci\u00f3n general, probablemente para la direcci\u00f3n no can\u00f3nica 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref en el rango [0x0000000000000010-0x0000000000000017] CPU: 1 UID: 0 PID: 230 Comm: syz-executor119 No contaminado 6.10.0-syzkaller-12585-g301927d2d2eb #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 27/06/2024 RIP: 0010:reuseport_add_sock+0x27e/0x5e0 net/core/ sock_reuseport.c:350 C\u00f3digo: 00 0f b7 5d 00 bf 01 00 00 00 89 de e8 1b a4 ff f7 83 fb 01 0f 85 a3 01 00 00 e8 6d a0 ff f7 49 8d 7e 12 48 89 f8 48 c1 e8 \u0026lt; 42\u0026gt; 0f b6 04 28 84 c0 0f 85 4b 02 00 00 41 0f b7 5e 12 49 8d 7e 14 RSP: 0018:ffffc9000b947c98 EFLAGS: 00010202 RAX: 0000000000000002 X: ffff8880252ddf98 RCX: ffff888079478000 RDX: 0000000000000000 RSI: 00000000000000001 RDI: 0000000000000012 RBP : 0000000000000001 R08: ffffffff8993e18d R09: 1ffffffff1fef385 R10: dffffc0000000000 R11: ffffbfff1fef386 R12: ffff8880252ddac0 R13: dffffc0000000000 : 0000000000000000 R15: 0000000000000000 FS: 00007f24e45b96c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcced5f7b8 CR3: 00000000241be000 CR4: 00000000003506f0 DR0: 00000000000000000 DR1: 0000000000000000 DR2: 0000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas:  __sctp_hash_endpoint net/sctp/input.c:762 [en l\u00ednea] sctp_hash_endpoint +0x52a/0x600 net/sctp/input.c:790 sctp_listen_start net/sctp/socket.c:8570 [en l\u00ednea] sctp_inet_listen+0x767/0xa20 net/sctp/socket.c:8625 __sys_listen_socket net/socket.c:1883 [en l\u00ednea ] __sys_listen+0x1b7/0x230 net/socket.c:1894 __do_sys_listen net/socket.c:1902 [en l\u00ednea] __se_sys_listen net/socket.c:1900 [en l\u00ednea] __x64_sys_listen+0x5a/0x70 net/socket.c:1900 arco x64/ x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f24e46039b9 C\u00f3digo: 28 00 00 00 75 05 8 83 c4 28 c3 e8 91 1a 00 00 90 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 \u0026lt;48\u0026gt; 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f24e45b9228 EFLAGS: 00000246 ORIG_RAX: 0000000000000032 RAX: ffffffffffffffda RBX: 00007f24e468e428 RCX: e46039b9 RDX: 00007f24e46039b9 RSI: 0000000000000003 RDI: 0000000000000004 ---truncado---"
          }
        ],
        "id": "CVE-2024-44935",
        "lastModified": "2026-06-17T07:53:15.543",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                "options": [
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                  },
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                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:27:48.024530Z",
                "version": "2.0.3"
              }
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        "published": "2024-08-26T11:15:05.643",
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          {
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            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e809a84c802377ef61525a298a1ec1728759b913"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T08:37:42+00:00",
      "cve": "CVE-2024-44935",
      "id": "CVE-2024-44935",
      "initial_release_date": "2024-08-26T00:00:00+00:00",
      "product_status:fixed": "429",
      "product_status:known_affected": "150",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: Fix null-ptr-deref in reuseport_add_sock().",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-44935.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T22:13:41.187Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
              },
              {
                "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-44935",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:27:48.024530Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:12.293Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/sctp/input.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "c9b3fc4f157867e858734e31022ebee8a24f0de7",
                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                },
                {
                  "lessThan": "52319d9d2f522ed939af31af70f8c3a0f0f67e6c",
                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                },
                {
                  "lessThan": "54b303d8f9702b8ab618c5032fae886b16356928",
                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                },
                {
                  "lessThan": "05e4a0fa248240efd99a539853e844f0f0a9e6a5",
                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                },
                {
                  "lessThan": "1407be30fc17eff918a98e0a990c0e988f11dc84",
                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                },
                {
                  "lessThan": "e809a84c802377ef61525a298a1ec1728759b913",
                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "6ba84574026792ce33a40c7da721dea36d0f3973",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/sctp/input.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.0"
                },
                {
                  "lessThan": "5.0",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.282",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.224",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.165",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.105",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.46",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.10.*",
                  "status": "unaffected",
                  "version": "6.10.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.11",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.282",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.224",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.165",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.105",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.46",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10.5",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.11",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: Fix null-ptr-deref in reuseport_add_sock().\n\nsyzbot reported a null-ptr-deref while accessing sk2-\u003esk_reuseport_cb in\nreuseport_add_sock(). [0]\n\nThe repro first creates a listener with SO_REUSEPORT.  Then, it creates\nanother listener on the same port and concurrently closes the first\nlistener.\n\nThe second listen() calls reuseport_add_sock() with the first listener as\nsk2, where sk2-\u003esk_reuseport_cb is not expected to be cleared concurrently,\nbut the close() does clear it by reuseport_detach_sock().\n\nThe problem is SCTP does not properly synchronise reuseport_alloc(),\nreuseport_add_sock(), and reuseport_detach_sock().\n\nThe caller of reuseport_alloc() and reuseport_{add,detach}_sock() must\nprovide synchronisation for sockets that are classified into the same\nreuseport group.\n\nOtherwise, such sockets form multiple identical reuseport groups, and\nall groups except one would be silently dead.\n\n  1. Two sockets call listen() concurrently\n  2. No socket in the same group found in sctp_ep_hashtable[]\n  3. Two sockets call reuseport_alloc() and form two reuseport groups\n  4. Only one group hit first in __sctp_rcv_lookup_endpoint() receives\n      incoming packets\n\nAlso, the reported null-ptr-deref could occur.\n\nTCP/UDP guarantees that would not happen by holding the hash bucket lock.\n\nLet\u0027s apply the locking strategy to __sctp_hash_endpoint() and\n__sctp_unhash_endpoint().\n\n[0]:\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\nCPU: 1 UID: 0 PID: 10230 Comm: syz-executor119 Not tainted 6.10.0-syzkaller-12585-g301927d2d2eb #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024\nRIP: 0010:reuseport_add_sock+0x27e/0x5e0 net/core/sock_reuseport.c:350\nCode: 00 0f b7 5d 00 bf 01 00 00 00 89 de e8 1b a4 ff f7 83 fb 01 0f 85 a3 01 00 00 e8 6d a0 ff f7 49 8d 7e 12 48 89 f8 48 c1 e8 03 \u003c42\u003e 0f b6 04 28 84 c0 0f 85 4b 02 00 00 41 0f b7 5e 12 49 8d 7e 14\nRSP: 0018:ffffc9000b947c98 EFLAGS: 00010202\nRAX: 0000000000000002 RBX: ffff8880252ddf98 RCX: ffff888079478000\nRDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000012\nRBP: 0000000000000001 R08: ffffffff8993e18d R09: 1ffffffff1fef385\nR10: dffffc0000000000 R11: fffffbfff1fef386 R12: ffff8880252ddac0\nR13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000\nFS:  00007f24e45b96c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffcced5f7b8 CR3: 00000000241be000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n __sctp_hash_endpoint net/sctp/input.c:762 [inline]\n sctp_hash_endpoint+0x52a/0x600 net/sctp/input.c:790\n sctp_listen_start net/sctp/socket.c:8570 [inline]\n sctp_inet_listen+0x767/0xa20 net/sctp/socket.c:8625\n __sys_listen_socket net/socket.c:1883 [inline]\n __sys_listen+0x1b7/0x230 net/socket.c:1894\n __do_sys_listen net/socket.c:1902 [inline]\n __se_sys_listen net/socket.c:1900 [inline]\n __x64_sys_listen+0x5a/0x70 net/socket.c:1900\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f24e46039b9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f24e45b9228 EFLAGS: 00000246 ORIG_RAX: 0000000000000032\nRAX: ffffffffffffffda RBX: 00007f24e468e428 RCX: 00007f24e46039b9\nRDX: 00007f24e46039b9 RSI: 0000000000000003 RDI: 0000000000000004\nRBP: 00007f24e468e420 R08: 00007f24e45b96c0 R09: 00007f24e45b96c0\nR10: 00007f24e45b96c0 R11: 0000000000000246 R12: 00007f24e468e42c\nR13:\n---truncated---"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:32:19.158Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/c9b3fc4f157867e858734e31022ebee8a24f0de7"
            },
            {
              "url": "https://git.kernel.org/stable/c/52319d9d2f522ed939af31af70f8c3a0f0f67e6c"
            },
            {
              "url": "https://git.kernel.org/stable/c/54b303d8f9702b8ab618c5032fae886b16356928"
            },
            {
              "url": "https://git.kernel.org/stable/c/05e4a0fa248240efd99a539853e844f0f0a9e6a5"
            },
            {
              "url": "https://git.kernel.org/stable/c/1407be30fc17eff918a98e0a990c0e988f11dc84"
            },
            {
              "url": "https://git.kernel.org/stable/c/e809a84c802377ef61525a298a1ec1728759b913"
            },
            {
              "url": "https://git.kernel.org/stable/c/9ab0faa7f9ffe31296dbb9bbe6f76c72c14eea18"
            }
          ],
          "title": "sctp: Fix null-ptr-deref in reuseport_add_sock().",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-44935",
        "datePublished": "2024-08-26T10:11:27.384Z",
        "dateReserved": "2024-08-21T05:34:56.664Z",
        "dateUpdated": "2026-05-11T20:32:19.158Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.