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net_sched: sch_sfq: fix a potential crash on gso_skb handling

Type: advisorySources: OSV

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 &

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.239, 5.15.186, 5.4.295, 6.1.142, 6.12.34, 6.15.3, 6.6.94
CVEs
CVE-2025-38115
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 10:40 UTC · Revision 1

Source evidence

net_sched: sch_sfq: fix a potential crash on gso_skb handling

core-osv · Original source

Published 3 Jul 2025, 08:35 UTC

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 &

osv:CVE-2025-38115

Kernel

Fixed versions: 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3

Complete source record
{
  "id": "39b1119e8eb4e26111f49e24bb0befe419ea695fda5861ed387187a4ed6153d8",
  "url": "https://osv.dev/vulnerability/CVE-2025-38115",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net_sched: sch_sfq: fix a potential crash on gso_skb handling",
    "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 &",
    "evidence": "osv:CVE-2025-38115",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.295",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.239",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.186",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.142",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.94",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-38115",
      "aliases": [
        "CVE-2025-38115"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "c337efb20d6d9f9bbb4746f6b119917af5c886dc"
                },
                {
                  "fixed": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085"
                },
                {
                  "fixed": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"
                },
                {
                  "fixed": "9c19498bdd7cb9d854bd3c54260f71cf7408495e"
                },
                {
                  "fixed": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533"
                },
                {
                  "fixed": "d1bc80da75c789f2f6830df89d91fb2f7a509943"
                },
                {
                  "fixed": "82448d4dcd8406dec688632a405fdcf7f170ec69"
                },
                {
                  "fixed": "82ffbe7776d0ac084031f114167712269bf3d832"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38115.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.16.0"
                },
                {
                  "fixed": "5.4.295"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.239"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.186"
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              ]
            },
            {
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              "events": [
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                  "introduced": "5.16.0"
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                  "fixed": "6.1.142"
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            },
            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.94"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.3"
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            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38115.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.004948013Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72",
        "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69",
        "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832",
        "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e",
        "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085",
        "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533",
        "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc",
        "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38115.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38115",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38115.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38115",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511655,
  "published_at": "2025-07-03T08:35:23.75+00:00"
}