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net_sched: red: fix a race in __red_change()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, 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 Source revision 1
Original source ↗

CVE-2025-38108

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-2025-38108

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": "0c8d13ac96070000da33f394f45e9c19638483c5",
        "lessThan": "2790c4ec481be45a80948d059cd7c9a06bc37493",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0c8d13ac96070000da33f394f45e9c19638483c5",
        "lessThan": "a1bf6a4e9264a685b0e642994031f9c5aad72414",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "110a47efcf23438ff8d31dbd9c854fae2a48bf98",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "f569984417a4e12c67366e69bdcb752970de921d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0c8d13ac96070000da33f394f45e9c19638483c5",
        "lessThan": "2a71924ca4af59ffc00f0444732b6cd54b153d0e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0c8d13ac96070000da33f394f45e9c19638483c5",
        "lessThan": "4b755305b2b0618e857fdadb499365b5f2e478d1",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "444ad445df5496a785705019268a8a84b84484bb",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "85a3e0ede38450ea3053b8c45d28cf55208409b8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_red.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "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_red.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38108

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30520 · Revision 1
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Publisher date
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