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codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() After making all ->qlen_notify() callbacks idempotent, now it is safe to remove the check of qlen!=0 from both fq_codel_dequeue() and codel_qdisc_dequeue().

Announced Group revision 1
Original source ↗

CVE-2025-37798

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-2025-37798

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": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "7a742a9506849d1c1aa71e36c89855ceddc7d58e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "cc71a757da78dd4aa1b4a9b19cb011833730ccf2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "829c49b6b2ff45b043739168fd1245e4e1a91a30",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "2f9761a94bae33d26e6a81b31b36e7d776d93dc1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "4d55144b12e742404bb3f8fee6038bafbf45619d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "e73c838c80dccb9e4f19becc11d9f3cb4a27d483",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409",
        "lessThan": "342debc12183b51773b3345ba267e9263bdfaaef",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_codel.c",
      "net/sched/sch_fq_codel.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.297",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.241",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.190",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.135",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.13.*"
      },
      {
        "status": "unaffected",
        "version": "6.14.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.14.*"
      },
      {
        "status": "unaffected",
        "version": "6.15",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/sch_codel.c",
      "net/sched/sch_fq_codel.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-37798

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30473 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2025-37798 · Revision 1Source updated