fkie_cve-2025-38115
Vulnerability from fkie_nvd
Published
2025-07-03 09:15
Modified
2025-12-17 18:13
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: net_sched: sch_sfq: fix a potential crash on gso_skb handling SFQ has an assumption of always being able to queue at least one packet. However, after the blamed commit, sch->q.len can be inflated by packets in sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed by an immediate drop. Fix sfq_drop() to properly clear q->tail in this situation. ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100 ip netns exec lb netserver netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 &
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
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 *
linux linux_kernel 6.16
debian debian_linux 11.0


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: fix a potential crash on gso_skb handling\n\nSFQ has an assumption of always being able to queue at least one packet.\n\nHowever, after the blamed commit, sch-\u003eq.len can be inflated by packets\nin sch-\u003egso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q-\u003etail in this situation.\n\n\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off                 # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\n\nip netns exec lb netserver\n\nnetperf -H 192.168.20.2 -l 100 \u0026\nnetperf -H 192.168.20.2 -l 100 \u0026\nnetperf -H 192.168.20.2 -l 100 \u0026\nnetperf -H 192.168.20.2 -l 100 \u0026"
    },
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: sch_sfq: se corrige un posible fallo en la gesti\u00f3n de gso_skb. SFQ asume que siempre puede poner en cola al menos un paquete. Sin embargo, tras la confirmaci\u00f3n responsable, sch-\u0026gt;q.len puede inflarse con paquetes en sch-\u0026gt;gso_skb, y una operaci\u00f3n enqueue() en una qdisc SFQ vac\u00eda puede ir seguida de un descarte inmediato. Corrija sfq_drop() para que borre correctamente q-\u0026gt;tail en esta situaci\u00f3n. ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100 ip netns exec lb netserver netperf -H 192.168.20.2 -l 100 \u0026amp; netperf -H 192.168.20.2 -l 100 \u0026amp; netperf -H 192.168.20.2 -l 100 \u0026amp; netperf -H 192.168.20.2 -l 100 \u0026amp; "
    }
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  "id": "CVE-2025-38115",
  "lastModified": "2025-12-17T18:13:53.820",
  "metrics": {
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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",
        "type": "Primary"
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  "published": "2025-07-03T09:15:25.350",
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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