CVE-2025-38115 (GCVE-0-2025-38115)
Vulnerability from cvelistv5
Published
2025-07-03 08:35
Modified
2025-07-28 04:12
Severity ?
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
Impacted products
Vendor Product Version
Linux Linux Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
Version: a53851e2c3218aa30b77abd6e68cf1c371f15afe
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_sfq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc",
              "status": "affected",
              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
            },
            {
              "lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085",
              "status": "affected",
              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
            },
            {
              "lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72",
              "status": "affected",
              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
            },
            {
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              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
            },
            {
              "lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533",
              "status": "affected",
              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
            },
            {
              "lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943",
              "status": "affected",
              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
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              "status": "affected",
              "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_sfq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.295",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.239",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.186",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.295",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.239",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.186",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.142",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.94",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.34",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.3",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:12:33.385Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"
        },
        {
          "url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"
        },
        {
          "url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"
        },
        {
          "url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"
        }
      ],
      "title": "net_sched: sch_sfq: fix a potential crash on gso_skb handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38115",
    "datePublished": "2025-07-03T08:35:23.750Z",
    "dateReserved": "2025-04-16T04:51:23.986Z",
    "dateUpdated": "2025-07-28T04:12:33.385Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38115\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-03T09:15:25.350\",\"lastModified\":\"2025-07-03T15:13:53.147\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"},{\"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; \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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