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net_sched: sch_sfq: fix a potential crash on gso_skb handling

Type: advisorySource: Official CVE List1 source record

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 &

Announced Source revision 1
Original source ↗

CVE-2025-38115

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-38115

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "9c19498bdd7cb9d854bd3c54260f71cf7408495e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "82448d4dcd8406dec688632a405fdcf7f170ec69",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
        "lessThan": "82ffbe7776d0ac084031f114167712269bf3d832",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_sfq.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.295",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.239",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.186",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.142",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.34",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.15.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.16",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/sch_sfq.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38115

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30524 · Revision 1
Added to Heist Feed
Publisher date
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