cve-2024-36889
Vulnerability from cvelistv5
Published
2024-05-30 15:28
Modified
2024-12-19 09:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: ensure snd_nxt is properly initialized on connect Christoph reported a splat hinting at a corrupted snd_una: WARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 __mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005 Modules linked in: CPU: 1 PID: 38 Comm: kworker/1:1 Not tainted 6.9.0-rc1-gbbeac67456c9 #59 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014 Workqueue: events mptcp_worker RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005 Code: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8 8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe <0f> 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9 RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4 RDX: ffff8881003cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: fefefefefefefeff R12: ffff888138ba8000 R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000 FS: 0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0 Call Trace: <TASK> __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [inline] mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [inline] __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615 mptcp_worker+0x434/0x740 net/mptcp/protocol.c:2767 process_one_work+0x1e0/0x560 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x3c7/0x640 kernel/workqueue.c:3416 kthread+0x121/0x170 kernel/kthread.c:388 ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 </TASK> When fallback to TCP happens early on a client socket, snd_nxt is not yet initialized and any incoming ack will copy such value into snd_una. If the mptcp worker (dumbly) tries mptcp-level re-injection after such ack, that would unconditionally trigger a send buffer cleanup using 'bad' snd_una values. We could easily disable re-injection for fallback sockets, but such dumb behavior already helped catching a few subtle issues and a very low to zero impact in practice. Instead address the issue always initializing snd_nxt (and write_seq, for consistency) at connect time.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html
Impacted products
Vendor Product Version
Linux Linux Version: 5.9
Show details on NVD website

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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-36889\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-30T16:15:12.410\",\"lastModified\":\"2024-11-21T09:22:44.553\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: ensure snd_nxt is properly initialized on connect\\n\\nChristoph reported a splat hinting at a corrupted snd_una:\\n\\n  WARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 __mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\\n  Modules linked in:\\n  CPU: 1 PID: 38 Comm: kworker/1:1 Not tainted 6.9.0-rc1-gbbeac67456c9 #59\\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\\n  Workqueue: events mptcp_worker\\n  RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\\n  Code: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8\\n  \\t8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe\\n  \\t\u003c0f\u003e 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9\\n  RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293\\n  RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4\\n  RDX: ffff8881003cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001\\n  RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\\n  R10: 0000000000000000 R11: fefefefefefefeff R12: ffff888138ba8000\\n  R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000\\n  FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000\\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n  CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0\\n  Call Trace:\\n   \u003cTASK\u003e\\n   __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [inline]\\n   mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [inline]\\n   __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615\\n   mptcp_worker+0x434/0x740 net/mptcp/protocol.c:2767\\n   process_one_work+0x1e0/0x560 kernel/workqueue.c:3254\\n   process_scheduled_works kernel/workqueue.c:3335 [inline]\\n   worker_thread+0x3c7/0x640 kernel/workqueue.c:3416\\n   kthread+0x121/0x170 kernel/kthread.c:388\\n   ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147\\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243\\n   \u003c/TASK\u003e\\n\\nWhen fallback to TCP happens early on a client socket, snd_nxt\\nis not yet initialized and any incoming ack will copy such value\\ninto snd_una. If the mptcp worker (dumbly) tries mptcp-level\\nre-injection after such ack, that would unconditionally trigger a send\\nbuffer cleanup using \u0027bad\u0027 snd_una values.\\n\\nWe could easily disable re-injection for fallback sockets, but such\\ndumb behavior already helped catching a few subtle issues and a very\\nlow to zero impact in practice.\\n\\nInstead address the issue always initializing snd_nxt (and write_seq,\\nfor consistency) at connect time.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mptcp: aseg\u00farese de que snd_nxt se inicialice correctamente al conectar Christoph inform\u00f3 un s\u00edmbolo que indica un snd_una da\u00f1ado: ADVERTENCIA: CPU: 1 PID: 38 en net/mptcp/protocol.c:1005 __mptcp_clean_una +0x4b3/0x620 net/mptcp/protocol.c:1005 M\u00f3dulos vinculados en: CPU: 1 PID: 38 Comm: kworker/1:1 No contaminado 6.9.0-rc1-gbbeac67456c9 #59 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 01/04/2014 Cola de trabajo: eventos mptcp_worker RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005 C\u00f3digo: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8 8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe \u0026lt;0f\u0026gt; 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9 RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4 RDX: 3cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000000000 R11: fefefefefefefeff R12 : ffff888138ba8000 R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000 FS: 00000000000000000(0000) GS:ffff88813bd00000(0000) nlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0 Rastreo de llamadas:  __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [en l\u00ednea] mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [en l\u00ednea] __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615 mptcp_worker+0x434/ 0x740 neto/ mptcp/protocol.c:2767 Process_one_work+0x1e0/0x560 kernel/workqueue.c:3254 Process_scheduled_works kernel/workqueue.c:3335 [en l\u00ednea] work_thread+0x3c7/0x640 kernel/workqueue.c:3416 kthread+0x121/0x170 kernel/kthread .c:388 ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243  Cuando el retorno a TCP ocurre temprano en un socket de cliente , snd_nxt a\u00fan no est\u00e1 inicializado y cualquier confirmaci\u00f3n entrante copiar\u00e1 dicho valor en snd_una. Si el trabajador mptcp (tontamente) intenta la reinyecci\u00f3n a nivel de mptcp despu\u00e9s de tal confirmaci\u00f3n, eso desencadenar\u00eda incondicionalmente una sanitizaci\u00f3n del b\u00fafer de env\u00edo utilizando valores snd_una \u0027incorrectos\u0027. Podr\u00edamos desactivar f\u00e1cilmente la reinyecci\u00f3n para los sockets de respaldo, pero un comportamiento tan tonto ya ayud\u00f3 a detectar algunos problemas sutiles y un impacto de muy bajo a cero en la pr\u00e1ctica. En su lugar, resuelva el problema siempre inicializando snd_nxt (y write_seq, para mantener la coherencia) en el momento de la conexi\u00f3n.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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