GHSA-R4R9-4CC8-C2CP

Vulnerability from github – Published: 2025-07-10 09:32 – Updated: 2025-12-18 18:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

net: tipc: fix refcount warning in tipc_aead_encrypt

syzbot reported a refcount warning 1 caused by calling get_net() on a network namespace that is being destroyed (refcount=0). This happens when a TIPC discovery timer fires during network namespace cleanup.

The recently added get_net() call in commit e279024617134 ("net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done") attempts to hold a reference to the network namespace. However, if the namespace is already being destroyed, its refcount might be zero, leading to the use-after-free warning.

Replace get_net() with maybe_get_net(), which safely checks if the refcount is non-zero before incrementing it. If the namespace is being destroyed, return -ENODEV early, after releasing the bearer reference.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38273"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-10T08:15:25Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tipc: fix refcount warning in tipc_aead_encrypt\n\nsyzbot reported a refcount warning [1] caused by calling get_net() on\na network namespace that is being destroyed (refcount=0). This happens\nwhen a TIPC discovery timer fires during network namespace cleanup.\n\nThe recently added get_net() call in commit e279024617134 (\"net/tipc:\nfix slab-use-after-free Read in tipc_aead_encrypt_done\") attempts to\nhold a reference to the network namespace. However, if the namespace\nis already being destroyed, its refcount might be zero, leading to the\nuse-after-free warning.\n\nReplace get_net() with maybe_get_net(), which safely checks if the\nrefcount is non-zero before incrementing it. If the namespace is being\ndestroyed, return -ENODEV early, after releasing the bearer reference.\n\n[1]: https://lore.kernel.org/all/68342b55.a70a0220.253bc2.0091.GAE@google.com/T/#m12019cf9ae77e1954f666914640efa36d52704a2",
  "id": "GHSA-r4r9-4cc8-c2cp",
  "modified": "2025-12-18T18:30:28Z",
  "published": "2025-07-10T09:32:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38273"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/307391e8fe70401a6d39ecc9978e13c2c0cdf81f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/445d59025d76d0638b03110f8791d5b89ed5162d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ff60e0d9974dccf24e89bcd3ee7933e538d929f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/acab7ca5ff19889b80a8ee7dec220ee1a96dede9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c762fc79d710d676b793f9d98b1414efe6eb51e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f29ccaa07cf3d35990f4d25028cc55470d29372b"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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