FKIE_CVE-2024-45016

Vulnerability from fkie_nvd - Published: 2024-09-11 16:15 - Updated: 2025-11-03 23:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netem: fix return value if duplicate enqueue fails There is a bug in netem_enqueue() introduced by commit 5845f706388a ("net: netem: fix skb length BUG_ON in __skb_to_sgvec") that can lead to a use-after-free. This commit made netem_enqueue() always return NET_XMIT_SUCCESS when a packet is duplicated, which can cause the parent qdisc's q.qlen to be mistakenly incremented. When this happens qlen_notify() may be skipped on the parent during destruction, leaving a dangling pointer for some classful qdiscs like DRR. There are two ways for the bug happen: - If the duplicated packet is dropped by rootq->enqueue() and then the original packet is also dropped. - If rootq->enqueue() sends the duplicated packet to a different qdisc and the original packet is dropped. In both cases NET_XMIT_SUCCESS is returned even though no packets are enqueued at the netem qdisc. The fix is to defer the enqueue of the duplicate packet until after the original packet has been guaranteed to return NET_XMIT_SUCCESS.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0486d31dd8198e22b63a4730244b38fffce6d469Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/52d99a69f3d556c6426048c9d481b912205919d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/577d6c0619467fe90f7e8e57e45cb5bd9d936014Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c07ff8592d57ed258afee5a5e04991a48dbaf382Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c414000da1c2ea1ba9a5e5bb1a4ba774e51e202dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5bb2988a310667abed66c7d3ffa28880cf0f883Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
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 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetem: fix return value if duplicate enqueue fails\n\nThere is a bug in netem_enqueue() introduced by\ncommit 5845f706388a (\"net: netem: fix skb length BUG_ON in __skb_to_sgvec\")\nthat can lead to a use-after-free.\n\nThis commit made netem_enqueue() always return NET_XMIT_SUCCESS\nwhen a packet is duplicated, which can cause the parent qdisc\u0027s q.qlen\nto be mistakenly incremented. When this happens qlen_notify() may be\nskipped on the parent during destruction, leaving a dangling pointer\nfor some classful qdiscs like DRR.\n\nThere are two ways for the bug happen:\n\n- If the duplicated packet is dropped by rootq-\u003eenqueue() and then\n  the original packet is also dropped.\n- If rootq-\u003eenqueue() sends the duplicated packet to a different qdisc\n  and the original packet is dropped.\n\nIn both cases NET_XMIT_SUCCESS is returned even though no packets\nare enqueued at the netem qdisc.\n\nThe fix is to defer the enqueue of the duplicate packet until after\nthe original packet has been guaranteed to return NET_XMIT_SUCCESS."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netem: corregir valor de retorno si falla la puesta en cola duplicada Hay un error en netem_enqueue() introducido por el commit 5845f706388a (\"net: netem: corregir BUG_ON de longitud de skb en __skb_to_sgvec\") que puede provocar un use-after-free. Esta confirmaci\u00f3n hizo que netem_enqueue() siempre devolviera NET_XMIT_SUCCESS cuando se duplica un paquete, lo que puede provocar que el q.qlen de la qdisc padre se incremente por error. Cuando esto sucede, es posible que qlen_notify() se omita en el padre durante la destrucci\u00f3n, dejando un puntero colgante para algunas qdisc con clase como DRR. Hay dos formas en las que ocurre el error: - Si el paquete duplicado se descarta mediante rootq-\u0026gt;enqueue() y luego tambi\u00e9n se descarta el paquete original. - Si rootq-\u0026gt;enqueue() env\u00eda el paquete duplicado a una qdisc diferente y se descarta el paquete original, en ambos casos se devuelve NET_XMIT_SUCCESS aunque no haya paquetes en cola en la qdisc netem. La soluci\u00f3n es posponer la puesta en cola del paquete duplicado hasta que se haya garantizado que el paquete original devolver\u00e1 NET_XMIT_SUCCESS."
    }
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  "id": "CVE-2024-45016",
  "lastModified": "2025-11-03T23:15:49.717",
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          "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2024-09-11T16:15:06.817",
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  "vulnStatus": "Modified",
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          "value": "CWE-416"
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      "source": "nvd@nist.gov",
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