fkie_cve-2022-49814
Vulnerability from fkie_nvd
Published
2025-05-01 15:16
Modified
2025-11-07 18:51
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: kcm: close race conditions on sk_receive_queue sk->sk_receive_queue is protected by skb queue lock, but for KCM sockets its RX path takes mux->rx_lock to protect more than just skb queue. However, kcm_recvmsg() still only grabs the skb queue lock, so race conditions still exist. We can teach kcm_recvmsg() to grab mux->rx_lock too but this would introduce a potential performance regression as struct kcm_mux can be shared by multiple KCM sockets. So we have to enforce skb queue lock in requeue_rx_msgs() and handle skb peek case carefully in kcm_wait_data(). Fortunately, skb_recv_datagram() already handles it nicely and is widely used by other sockets, we can just switch to skb_recv_datagram() after getting rid of the unnecessary sock lock in kcm_recvmsg() and kcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets, so it is safe to get rid of this check too. I ran the original syzbot reproducer for 30 min without seeing any issue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: close race conditions on sk_receive_queue\n\nsk-\u003esk_receive_queue is protected by skb queue lock, but for KCM\nsockets its RX path takes mux-\u003erx_lock to protect more than just\nskb queue. However, kcm_recvmsg() still only grabs the skb queue\nlock, so race conditions still exist.\n\nWe can teach kcm_recvmsg() to grab mux-\u003erx_lock too but this would\nintroduce a potential performance regression as struct kcm_mux can\nbe shared by multiple KCM sockets.\n\nSo we have to enforce skb queue lock in requeue_rx_msgs() and handle\nskb peek case carefully in kcm_wait_data(). Fortunately,\nskb_recv_datagram() already handles it nicely and is widely used by\nother sockets, we can just switch to skb_recv_datagram() after\ngetting rid of the unnecessary sock lock in kcm_recvmsg() and\nkcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,\nso it is safe to get rid of this check too.\n\nI ran the original syzbot reproducer for 30 min without seeing any\nissue."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kcm: condiciones de ejecuci\u00f3n cerradas en sk_receive_queue. sk-\u0026gt;sk_receive_queue est\u00e1 protegido por el bloqueo de cola skb, pero para los sockets KCM su ruta RX toma mux-\u0026gt;rx_lock para proteger m\u00e1s que solo la cola skb. Sin embargo, kcm_recvmsg() todav\u00eda solo captura el bloqueo de cola skb, por lo que las condiciones de ejecuci\u00f3n a\u00fan existen. Podemos ense\u00f1ar a kcm_recvmsg() a capturar tambi\u00e9n mux-\u0026gt;rx_lock, pero esto introducir\u00eda una posible regresi\u00f3n del rendimiento, ya que la estructura kcm_mux puede ser compartida por varios sockets KCM. Por lo tanto, debemos aplicar el bloqueo de cola skb en requeue_rx_msgs() y manejar el caso de skb peek con cuidado en kcm_wait_data(). Afortunadamente, skb_recv_datagram() ya lo gestiona correctamente y es ampliamente utilizado por otros sockets. Podemos cambiar a skb_recv_datagram() tras eliminar el bloqueo de sock innecesario en kcm_recvmsg() y kcm_splice_read(). Nota: Los sockets KCM no utilizan SOCK_DONE, por lo que tambi\u00e9n es seguro omitir esta comprobaci\u00f3n. Ejecut\u00e9 el reproductor syzbot original durante 30 minutos sin observar ning\u00fan problema."
    }
  ],
  "id": "CVE-2022-49814",
  "lastModified": "2025-11-07T18:51:24.070",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-01T15:16:04.787",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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