CVE-2026-89687High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file ->atomic_open is permitted to return success without actually opening the file. It indicates this b…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · 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 CVEORG
0.2%
— → 5.9
— → 7.5
none → high
7.5 → 5.9
high → medium
5.9 → 7.5
medium → high
7.5 → 5.9
high → medium
5.9 → 5.5
0.2% → 0.5%
Last analysed / modified upstream
5.5 → 7.5
medium → high
In the Linux kernel, the following vulnerability has been resolved:
nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file
->atomic_open is permitted to return success without actually opening the file. It indicates this by calling finish_no_open(). This means dentry_create() can return a file which hasn't been opened. This is extremely unlikely as ->atomic_open handlers typically use finish_no_open() only for already existing files, and dentry_create() isn't called in that case, and the parent being locked should prevent races.
However out of an abundance of caution it seems wise to teach nfsd to only use the file returned by dentry_create() if FMODE_OPENED is set, indicating that it has in fact been opened.
Linux >= 64a989dbd144e0622371396461b11335459692d2 < a95a1cffacd0203100297001719160160f443dd6Linux >= 64a989dbd144e0622371396461b11335459692d2 < 5859cc01fee06a2cd7458905a9593082fbab06e1Linux 7.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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