CVE-2024-49946

{
  "id": "CVE-2024-49946",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-49946",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-10-22T13:37:03.573119Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "lessThan": "176dd41e8c2bd997ed3d66568a3362e69ecce99b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "lessThan": "635deca1800a68624f185dc1e04a8495b48cf185",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "lessThan": "f9620e2a665aa642625bd2501282bbddff556bd7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "lessThan": "efe9cc0f7c0279216a5522271ec675b8288602e4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "lessThan": "c837f8583535f094a39386308c2ccfd92c8596cd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "lessThan": "aec7291003df78cb71fd461d7b672912bde55807",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ppp/ppp_generic.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.168",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.113",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.55",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.10.14",
              "versionType": "semver",
              "lessThanOrEqual": "6.10.*"
            },
            {
              "status": "unaffected",
              "version": "6.11.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.11.*"
            },
            {
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ppp/ppp_generic.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2024-10-21T18:15:16.133",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/176dd41e8c2bd997ed3d66568a3362e69ecce99b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/635deca1800a68624f185dc1e04a8495b48cf185",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aec7291003df78cb71fd461d7b672912bde55807",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c837f8583535f094a39386308c2ccfd92c8596cd",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/efe9cc0f7c0279216a5522271ec675b8288602e4",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f9620e2a665aa642625bd2501282bbddff556bd7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: do not assume bh is held in ppp_channel_bridge_input()\n\nNetworking receive path is usually handled from BH handler.\nHowever, some protocols need to acquire the socket lock, and\npackets might be stored in the socket backlog is the socket was\nowned by a user process.\n\nIn this case, release_sock(), __release_sock(), and sk_backlog_rcv()\nmight call the sk->sk_backlog_rcv() handler in process context.\n\nsybot caught ppp was not considering this case in\nppp_channel_bridge_input() :\n\nWARNING: inconsistent lock state\n6.11.0-rc7-syzkaller-g5f5673607153 #0 Not tainted\n--------------------------------\ninconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.\nksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] takes:\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n{SOFTIRQ-ON-W} state was registered at:\n   lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759\n   __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n   _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154\n   spin_lock include/linux/spinlock.h:351 [inline]\n   ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n   ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n   pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379\n   sk_backlog_rcv include/net/sock.h:1111 [inline]\n   __release_sock+0x1a8/0x3d8 net/core/sock.c:3004\n   release_sock+0x68/0x1b8 net/core/sock.c:3558\n   pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903\n   sock_sendmsg_nosec net/socket.c:730 [inline]\n   __sock_sendmsg net/socket.c:745 [inline]\n   __sys_sendto+0x374/0x4f4 net/socket.c:2204\n   __do_sys_sendto net/socket.c:2216 [inline]\n   __se_sys_sendto net/socket.c:2212 [inline]\n   __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212\n   __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n   invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n   el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n   do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n   el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712\n   el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n   el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nirq event stamp: 282914\n hardirqs last  enabled at (282914): [<ffff80008b42e30c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]\n hardirqs last  enabled at (282914): [<ffff80008b42e30c>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162\n softirqs last  enabled at (282904): [<ffff8000801f8e88>] softirq_handle_end kernel/softirq.c:400 [inline]\n softirqs last  enabled at (282904): [<ffff8000801f8e88>] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582\n softirqs last disabled at (282909): [<ffff8000801fbdf8>] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n       CPU0\n       ----\n  lock(&pch->downl);\n  <Interrupt>\n    lock(&pch->downl);\n\n *** DEADLOCK ***\n\n1 lock held by ksoftirqd/1/24:\n  #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall trace:\n  dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319\n  show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326\n  __dump_sta\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ppp: no asuma que bh se mantiene en ppp_channel_bridge_input() La ruta de recepción de red generalmente se maneja desde el controlador BH. Sin embargo, algunos protocolos necesitan adquirir el bloqueo del socket y los paquetes pueden almacenarse en el backlog del socket si el socket era propiedad de un proceso de usuario. En este caso, release_sock(), __release_sock() y sk_backlog_rcv() pueden llamar al controlador sk-&gt;sk_backlog_rcv() en el contexto del proceso. sybot capturó que ppp no estaba considerando este caso en ppp_channel_bridge_input(): ADVERTENCIA: estado de bloqueo inconsistente 6.11.0-rc7-syzkaller-g5f5673607153 #0 No contaminado -------------------------------- uso inconsistente de {SOFTIRQ-ON-W} -&gt; {IN-SOFTIRQ-W}. ksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] toma: ffff0000db7f11e0 (&amp;pch-&gt;downl){+.?.}-{2:2}, en: spin_lock include/linux/spinlock.h:351 [en línea] ffff0000db7f11e0 (&amp;pch-&gt;downl){+.?.}-{2:2}, en: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [en línea] ffff0000db7f11e0 (&amp;pch-&gt;downl){+.?.}-{2:2}, en: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304 El estado {SOFTIRQ-ON-W} se registró en: lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [en línea] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [en línea] ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [en línea] ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304 pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv incluir/net/sock.h:1111 [en línea] __release_sock+0x1a8/0x3d8 net/core/sock.c:3004 release_sock+0x68/0x1b8 net/core/sock.c:3558 pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903 sock_sendmsg_nosec net/socket.c:730 [en línea] __sock_sendmsg net/socket.c:745 [en línea] __sys_sendto+0x374/0x4f4 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [en línea] __se_sys_sendto net/socket.c:2212 [en línea] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212 __invoke_syscall arch/arm64/kernel/syscall.c:35 [en línea] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 marca de evento de irq: 282914 hardirqs habilitados por última vez en (282914): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [en línea] hardirqs habilitados por última vez en (282914): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs deshabilitados por última vez en (282913): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [en línea] hardirqs se desactivó por última vez en (282913): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs se activó por última vez en (282904): [] softirq_handle_end kernel/softirq.c:400 [en línea] softirqs se activó por última vez en (282904): [] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582 softirqs se desactivó por última vez en (282909): [] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928 otra información que podría ayudarnos a depurar esto: Posible escenario de bloqueo inseguro: CPU0 ---- lock(&amp;pch-&gt;downl);  lock(&amp;pch-&gt;downl); *** BLOQUEO INTERMEDIO *** 1 bloqueo mantenido por ksoftirqd/1/24: #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325 seguimiento de pila: CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 No contaminado 6.11.0-rc7-syzkaller-g5f5673607153 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Seguimiento de llamadas: dump_backtrace+0x1b8/0x1e4 arch/ar---truncado---"
    }
  ],
  "lastModified": "2026-06-17T08:00:47.537",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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}