GHSA-7Q5J-M65F-W95R
Vulnerability from github – Published: 2025-07-04 15:31 – Updated: 2026-05-12 15:30In the Linux kernel, the following vulnerability has been resolved:
nfsd: Initialize ssc before laundromat_work to prevent NULL dereference
In nfs4_state_start_net(), laundromat_work may access nfsd_ssc through nfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized, this can cause NULL pointer dereference.
Normally the delayed start of laundromat_work allows sufficient time for nfsd_ssc initialization to complete. However, when the kernel waits too long for userspace responses (e.g. in nfs4_state_start_net -> nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done -> cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the delayed work may start before nfsd_ssc initialization finishes.
Fix this by moving nfsd_ssc initialization before starting laundromat_work.
{
"affected": [],
"aliases": [
"CVE-2025-38231"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-04T14:15:32Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Initialize ssc before laundromat_work to prevent NULL dereference\n\nIn nfs4_state_start_net(), laundromat_work may access nfsd_ssc through\nnfs4_laundromat -\u003e nfsd4_ssc_expire_umount. If nfsd_ssc isn\u0027t initialized,\nthis can cause NULL pointer dereference.\n\nNormally the delayed start of laundromat_work allows sufficient time for\nnfsd_ssc initialization to complete. However, when the kernel waits too\nlong for userspace responses (e.g. in nfs4_state_start_net -\u003e\nnfsd4_end_grace -\u003e nfsd4_record_grace_done -\u003e nfsd4_cld_grace_done -\u003e\ncld_pipe_upcall -\u003e __cld_pipe_upcall -\u003e wait_for_completion path), the\ndelayed work may start before nfsd_ssc initialization finishes.\n\nFix this by moving nfsd_ssc initialization before starting laundromat_work.",
"id": "GHSA-7q5j-m65f-w95r",
"modified": "2026-05-12T15:30:54Z",
"published": "2025-07-04T15:31:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38231"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0fccf5f01ed28725cc313a66ca1247eef911d55e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5060e1a5fef184bd11d298e3f0ee920d96a23236"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a97668ec6d73dab237cd1c15efe012a10090a4ed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b31da62889e6d610114d81dc7a6edbcaa503fcf8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/deaeb74ae9318252829c59a84a7d2316fc335660"
},
{
"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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