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net_sched: ets: fix a race in ets_qdisc_change()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: fix a race in ets_qdisc_change() Gerrard Tai reported a race condition in ETS, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.

Announced Group revision 1
Original source ↗

CVE-2025-38107

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-2025-38107

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": "699d82e9a6db29d509a71f1f2f4316231e6232e6",
        "lessThan": "eb7b74e9754e1ba2088f914ad1f57a778b11894b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ce881ddbdc028fb1988b66e40e45ca0529c23b46",
        "lessThan": "0b479d0aa488cb478eb2e1d8868be946ac8afb4f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b05972f01e7d30419987a1f221b5593668fd6448",
        "lessThan": "347867cb424edae5fec1622712c8dd0a2c42918f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b05972f01e7d30419987a1f221b5593668fd6448",
        "lessThan": "0383b25488a545be168744336847549d4a2d3d6c",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "073f64c03516bcfaf790f8edc772e0cfb8a84ec3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b05972f01e7d30419987a1f221b5593668fd6448",
        "lessThan": "fed94bd51d62d2e0e006aa61480e94e5cd0582b0",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "d92adacdd8c2960be856e0b82acc5b7c5395fddb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fffa19b5e58c34004a0d6f642d9c24b11d213994",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fb155f6597cd7bc3aeed668c3bb15fc3b7cb257d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.142",
        "lessThan": "5.10.239",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.66",
        "lessThan": "5.15.186",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.4.213",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.19.8",
        "lessThan": "5.20",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/sched/sch_ets.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.0",
        "versionType": "semver"
      },
      {
        "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_ets.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38107

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30519 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2025-38107 · Revision 1Source updated