GHSA-XRJ4-4G3M-87PF
Vulnerability from github – Published: 2025-09-16 15:32 – Updated: 2026-07-14 15:31In the Linux kernel, the following vulnerability has been resolved:
net: rose: convert 'use' field to refcount_t
The 'use' field in struct rose_neigh is used as a reference counter but lacks atomicity. This can lead to race conditions where a rose_neigh structure is freed while still being referenced by other code paths.
For example, when rose_neigh->use becomes zero during an ioctl operation via rose_rt_ioctl(), the structure may be removed while its timer is still active, potentially causing use-after-free issues.
This patch changes the type of 'use' from unsigned short to refcount_t and updates all code paths to use rose_neigh_hold() and rose_neigh_put() which operate reference counts atomically.
{
"affected": [],
"aliases": [
"CVE-2025-39826"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-16T13:16:02Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rose: convert \u0027use\u0027 field to refcount_t\n\nThe \u0027use\u0027 field in struct rose_neigh is used as a reference counter but\nlacks atomicity. This can lead to race conditions where a rose_neigh\nstructure is freed while still being referenced by other code paths.\n\nFor example, when rose_neigh-\u003euse becomes zero during an ioctl operation\nvia rose_rt_ioctl(), the structure may be removed while its timer is\nstill active, potentially causing use-after-free issues.\n\nThis patch changes the type of \u0027use\u0027 from unsigned short to refcount_t and\nupdates all code paths to use rose_neigh_hold() and rose_neigh_put() which\noperate reference counts atomically.",
"id": "GHSA-xrj4-4g3m-87pf",
"modified": "2026-07-14T15:31:27Z",
"published": "2025-09-16T15:32:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39826"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0085b250fcc79f900c82a69980ec2f3e1871823b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/203e4f42596ede31498744018716a3db6dbb7f51"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d860d1faa6b2ce3becfdb8b0c2b048ad31800061"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f8c29fc437d03a98fb075c31c5be761cc8326284"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fb07156cc0742ba4e93dfcc84280c011d05b301f"
},
{
"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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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