GHSA-9GQR-9337-3JR8

Vulnerability from github – Published: 2025-07-03 09:30 – Updated: 2025-11-03 18:31
VLAI?
Details

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 &

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38115"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-03T09:15:25Z",
    "severity": null
  },
  "details": "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",
  "id": "GHSA-9gqr-9337-3jr8",
  "modified": "2025-11-03T18:31:20Z",
  "published": "2025-07-03T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38115"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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