CVE-2026-89704High· 7.0▾ TwilightA flaw was found in the Linux kernel's nfsd component. The _nfsd_copy_file_range() function incorrectly samples the writeback error cursor after the copy loop. This allows a concurrent write operation to advance the error cursor prematurel…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 6.8
none → medium
— → 6.8
none → medium
— → 7.5
none → high
7.5 → 6.8
high → medium
6.8 → 7.5
medium → high
0.2% → 0.5%
Last analysed / modified upstream
7.5 → 7
A flaw was found in the Linux kernel's nfsd component. The _nfsd_copy_file_range() function incorrectly samples the writeback error cursor after the copy loop. This allows a concurrent write operation to advance the error cursor prematurely. As a result, the system may report that data has been successfully committed even when writeback errors have occurred, leading to silent data loss where clients perceive data as durable when it is not.
kernel: nfsd: sample writeback error cursor before async COPY loop — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.
Affected:
No fix planned:
Not affected:
Out of support scope
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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