CVE-2026-93229
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the NFS server (nfsd), there is a missing read barrier in the rpc_status_get dumpit function, which on weakly-ordered architectures (ARM, POWER) can lead to an ineffective retry mechanism. This could result in reading inconsistent data. The fix adds smp_rmb() before the second counter check.
Risk Assessment
Risk of inconsistent data in NFS responses, potentially leading to communication errors or service failure.
Recommendation
Update the kernel to get the fix. If not possible, restrict access to NFS services.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nfsd: add missing read barrier to rpc_status_get dumpit seqcount retry The hand-rolled seqcount-like protocol in nfsd_nl_rpc_status_get_dumpit() is missing a read memory barrier (smp_rmb) before its second counter check. The standard kernel read_seqcount_retry() includes smp_rmb() to ensure that all data reads complete before the counter is re-checked. Without this barrier, on weakly-ordered architectures (ARM, POWER), the CPU may reorder field reads past the second counter check, making the retry logic ineffective: it could observe a consistent counter pair while reading fields that have been concurrently modified by the writer. Add smp_rmb() before the second counter check to order the field reads ahead of it, matching the barrier semantics of the standard seqcount read-side. The begin-side smp_load_acquire() already pairs with the smp_store_release() in nfsd_dispatch(); with the smp_rmb() now ordering the field reads, the retry check no longer needs acquire semantics and reads the counter with a plain READ_ONCE(), as read_seqcount_retry() does. [ cel: Use READ_ONCE instead of smp_load_acquire() ]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS