ghsa-f6x4-fwp3-vv23
Vulnerability from github
Published
2025-04-16 15:34
Modified
2025-04-16 15:34
Details

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

net: decrease cached dst counters in dst_release

Upstream fix ac888d58869b ("net: do not delay dst_entries_add() in dst_release()") moved decrementing the dst count from dst_destroy to dst_release to avoid accessing already freed data in case of netns dismantle. However in case CONFIG_DST_CACHE is enabled and OvS+tunnels are used, this fix is incomplete as the same issue will be seen for cached dsts:

Unable to handle kernel paging request at virtual address ffff5aabf6b5c000 Call trace: percpu_counter_add_batch+0x3c/0x160 (P) dst_release+0xec/0x108 dst_cache_destroy+0x68/0xd8 dst_destroy+0x13c/0x168 dst_destroy_rcu+0x1c/0xb0 rcu_do_batch+0x18c/0x7d0 rcu_core+0x174/0x378 rcu_core_si+0x18/0x30

Fix this by invalidating the cache, and thus decrementing cached dst counters, in dst_release too.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-22057"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:15:59Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: decrease cached dst counters in dst_release\n\nUpstream fix ac888d58869b (\"net: do not delay dst_entries_add() in\ndst_release()\") moved decrementing the dst count from dst_destroy to\ndst_release to avoid accessing already freed data in case of netns\ndismantle. However in case CONFIG_DST_CACHE is enabled and OvS+tunnels\nare used, this fix is incomplete as the same issue will be seen for\ncached dsts:\n\n  Unable to handle kernel paging request at virtual address ffff5aabf6b5c000\n  Call trace:\n   percpu_counter_add_batch+0x3c/0x160 (P)\n   dst_release+0xec/0x108\n   dst_cache_destroy+0x68/0xd8\n   dst_destroy+0x13c/0x168\n   dst_destroy_rcu+0x1c/0xb0\n   rcu_do_batch+0x18c/0x7d0\n   rcu_core+0x174/0x378\n   rcu_core_si+0x18/0x30\n\nFix this by invalidating the cache, and thus decrementing cached dst\ncounters, in dst_release too.",
  "id": "GHSA-f6x4-fwp3-vv23",
  "modified": "2025-04-16T15:34:41Z",
  "published": "2025-04-16T15:34:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22057"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a0a3ff6593d670af2451ec363ccb7b18aec0c0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/836415a8405c9665ae55352fc5ba865c242f5e4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92a5c18513117be69bc00419dd1724c1940f8fcd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccc331fd5bcae131d2627d5ef099d4a1f6540aea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e833e7ad64eb2f63867f65303be49ca30ee8819e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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