CVE-2026-22980High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hasht…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
0.1% → 0.1%
In the Linux kernel, the following vulnerability has been resolved:
nfsd: provide locking for v4_end_grace
Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hashtbl in particularly.
We cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is held while client_tracking_op->init() is called and that can wait for an upcall to nfsdcltrack which can write to v4_end_grace, resulting in a deadlock.
nfsd4_end_grace() is also called by the landromat work queue and this doesn't require locking as server shutdown will stop the work and wait for it before freeing anything that nfsd4_end_grace() might access.
However, we must be sure that writing to v4_end_grace doesn't restart the work item after shutdown has already waited for it. For this we add a new flag protected with nn->client_lock. It is set only while it is safe to make client tracking calls, and v4_end_grace only schedules work while the flag is set with the spinlock held.
So this patch adds a nfsd_net field "client_tracking_active" which is set as described. Another field "grace_end_forced", is set when v4_end_grace is written. After this is set, and providing client_tracking_active is set, the laundromat is scheduled. This "grace_end_forced" field bypasses other checks for whether the grace period has finished.
This resolves a race which can result in use-after-free.
Linux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < ca97360860eb02e3ae4ba42c19b439a0fcecbf06Linux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < e8bfa2401d4c51eca6e48e9b33c798828ca9df61Linux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 34eb22836e0cdba093baac66599d68c4cd245a9dLinux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 06600719d0f7a723811c45e4d51f5b742f345309Linux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < ba4811c8b433bfa681729ca42cc62b6034f223b0Linux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 53f07d095e7e680c5e4569a55a019f2c0348cdc6Linux >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 2857bd59feb63fcf40fe4baf55401baea6b4feb4Linux 3.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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