ghsa-3vxj-mcrg-4r6j
Vulnerability from github
Published
2025-07-03 09:30
Modified
2025-07-03 09:30
Details

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

[3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() |

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38108"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-03T09:15:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: red: fix a race in __red_change()\n\nGerrard Tai reported a race condition in RED, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0                                 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n |                                    [5]: lock root\n |                                    [6]: rehash\n |                                    [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent\u0027s qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock.",
  "id": "GHSA-3vxj-mcrg-4r6j",
  "modified": "2025-07-03T09:30:33Z",
  "published": "2025-07-03T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38108"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2790c4ec481be45a80948d059cd7c9a06bc37493"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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