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net_sched: prio: fix a race in prio_tune()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, 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-2025-38083

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-2025-38083

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": "7b8e0b6e659983154c8d7e756cdb833d89a3d4d7",
        "lessThan": "53d11560e957d53ee87a0653d258038ce12361b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7b8e0b6e659983154c8d7e756cdb833d89a3d4d7",
        "lessThan": "4483d8b9127591c60c4eb789d6cab953bc4522a9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7b8e0b6e659983154c8d7e756cdb833d89a3d4d7",
        "lessThan": "20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7b8e0b6e659983154c8d7e756cdb833d89a3d4d7",
        "lessThan": "3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "46c15c9d0f65c9ba857d63f53264f4b17e8a715f",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "e3f6745006dc9423d2b065b90f191cfa11b1b584",
        "versionType": "git"
      },
      {
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        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "d35acc1be3480505b5931f17e4ea9b7617fea4d3",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_prio.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_prio.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38083

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30513 · Revision 1
Added to Heist Feed
Publisher date
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