CVE-2025-39827 (GCVE-0-2025-39827)
Vulnerability from cvelistv5
Published
2025-09-16 13:00
Modified
2025-09-16 13:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: rose: include node references in rose_neigh refcount Current implementation maintains two separate reference counting mechanisms: the 'count' field in struct rose_neigh tracks references from rose_node structures, while the 'use' field (now refcount_t) tracks references from rose_sock. This patch merges these two reference counting systems using 'use' field for proper reference management. Specifically, this patch adds incrementing and decrementing of rose_neigh->use when rose_neigh->count is incremented or decremented. This patch also modifies rose_rt_free(), rose_rt_device_down() and rose_clear_route() to properly release references to rose_neigh objects before freeing a rose_node through rose_remove_node(). These changes ensure rose_neigh structures are properly freed only when all references, including those from rose_node structures, are released. As a result, this resolves a slab-use-after-free issue reported by Syzbot.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/384210cceb1873a4c8218b27ba0745444436b728
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4cce478c3e82a5fc788d72adb2f4c4e983997639
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c547c8eee9d1cf6e744611d688b9f725cf9a115
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d7563b456ed44151e1a82091d96f60166daea89b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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   Linux Linux Version: 2.6.12
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "net/rose/rose_route.c"
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rose: include node references in rose_neigh refcount\n\nCurrent implementation maintains two separate reference counting\nmechanisms: the \u0027count\u0027 field in struct rose_neigh tracks references from\nrose_node structures, while the \u0027use\u0027 field (now refcount_t) tracks\nreferences from rose_sock.\n\nThis patch merges these two reference counting systems using \u0027use\u0027 field\nfor proper reference management. Specifically, this patch adds incrementing\nand decrementing of rose_neigh-\u003euse when rose_neigh-\u003ecount is incremented\nor decremented.\n\nThis patch also modifies rose_rt_free(), rose_rt_device_down() and\nrose_clear_route() to properly release references to rose_neigh objects\nbefore freeing a rose_node through rose_remove_node().\n\nThese changes ensure rose_neigh structures are properly freed only when\nall references, including those from rose_node structures, are released.\nAs a result, this resolves a slab-use-after-free issue reported by Syzbot."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-16T13:00:25.555Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45"
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      ],
      "title": "net: rose: include node references in rose_neigh refcount",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39827",
    "datePublished": "2025-09-16T13:00:25.555Z",
    "dateReserved": "2025-04-16T07:20:57.140Z",
    "dateUpdated": "2025-09-16T13:00:25.555Z",
    "state": "PUBLISHED"
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  }
}


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