github - ghsa-qrx3-r5gv-42g6

GHSA-QRX3-R5GV-42G6

Vulnerability from github – Published: 2025-09-16 15:32 – Updated: 2025-11-03 18:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39827"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T13:16:02Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-qrx3-r5gv-42g6",
  "modified": "2025-11-03T18:31:41Z",
  "published": "2025-09-16T15:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39827"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/384210cceb1873a4c8218b27ba0745444436b728"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cce478c3e82a5fc788d72adb2f4c4e983997639"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c547c8eee9d1cf6e744611d688b9f725cf9a115"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7563b456ed44151e1a82091d96f60166daea89b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-39827 (GCVE-0-2025-39827)

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2025-11-03 17:43

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/4cce478c3e82a5fc7…
	https://git.kernel.org/stable/c/9c547c8eee9d1cf6e…
	https://git.kernel.org/stable/c/d7563b456ed44151e…
	https://git.kernel.org/stable/c/384210cceb1873a4c…
	https://git.kernel.org/stable/c/da9c9c877597170b9…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4cce478c3e82a5fc788d72adb2f4c4e983997639 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9c547c8eee9d1cf6e744611d688b9f725cf9a115 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d7563b456ed44151e1a82091d96f60166daea89b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 384210cceb1873a4c8218b27ba0745444436b728 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < da9c9c877597170b929a6121a68dcd3dd9a80f45 (git)

Linux

Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.1.150 , ≤ 6.1.* (semver)
Unaffected: 6.6.104 , ≤ 6.6.* (semver)
Unaffected: 6.12.45 , ≤ 6.12.* (semver)
Unaffected: 6.16.5 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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GHSA-QRX3-R5GV-42G6

CVE-2025-39827 (GCVE-0-2025-39827)

Tags

Sightings

Nomenclature