Description
In 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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= a4bc287943f5695209ff36bdc89f17b48d68fae7, < deaeb74ae9318252829c59a84a7d2316fc335660; >= f4e44b393389c77958f7c58bf4415032b4cda15b, < 0fccf5f01ed28725cc313a66ca1247eef911d55e; >= f4e44b393389c77958f7c58bf4415032b4cda15b, < a97668ec6d73dab237cd1c15efe012a10090a4ed; >= f4e44b393389c77958f7c58bf4415032b4cda15b, < 5060e1a5fef184bd11d298e3f0ee920d96a23236; >= f4e44b393389c77958f7c58bf4415032b4cda15b, < d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0; >= f4e44b393389c77958f7c58bf4415032b4cda15b, < 83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64; >= f4e44b393389c77958f7c58bf4415032b4cda15b, < b31da62889e6d610114d81dc7a6edbcaa503fcf8; >= 5.10.220, < 5.10.239 |
| Linux | Linux | 5.14 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
References
- https://git.kernel.org/stable/c/0fccf5f01ed28725cc313a66ca1247eef911d55ePatch
- https://git.kernel.org/stable/c/5060e1a5fef184bd11d298e3f0ee920d96a23236Patch
- https://git.kernel.org/stable/c/83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64Patch
- https://git.kernel.org/stable/c/a97668ec6d73dab237cd1c15efe012a10090a4edPatch
- https://git.kernel.org/stable/c/b31da62889e6d610114d81dc7a6edbcaa503fcf8Patch
- https://git.kernel.org/stable/c/d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0Patch
- https://git.kernel.org/stable/c/deaeb74ae9318252829c59a84a7d2316fc335660Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Timeline
- Published
- Jul 4, 2025
- Last modified
- Nov 5, 2026
- NVD status
- Modified