CVE-2025-38231 (GCVE-0-2025-38231)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2025-11-03 17:35
VLAI?
Title
nfsd: Initialize ssc before laundromat_work to prevent NULL dereference
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a4bc287943f5695209ff36bdc89f17b48d68fae7 , < deaeb74ae9318252829c59a84a7d2316fc335660 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 0fccf5f01ed28725cc313a66ca1247eef911d55e (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < a97668ec6d73dab237cd1c15efe012a10090a4ed (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 5060e1a5fef184bd11d298e3f0ee920d96a23236 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64 (git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < b31da62889e6d610114d81dc7a6edbcaa503fcf8 (git)
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    Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.239 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.95 , ≤ 6.6.* (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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          "value": "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."
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