CVE-2026-89677Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file() dentry_create() can hypothetically provide a different dentry than the one passed in. This could …
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · 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%
— → 9.8
none → critical
9.8 → 6.8
critical → medium
6.8 → 9.8
medium → critical
9.8 → 6.8
critical → medium
6.8 → 7
medium → high
0.2% → 0.6%
Last analysed / modified upstream
7 → 9.8
high → critical
In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
dentry_create() can hypothetically provide a different dentry than the one passed in. This could happen, for example, if the exported filesystem is NFS, and the server returned to OPEN a filehandle which matched a directory that was already in the dcache. Clearly this would not be expected!
If this were to happen the dentry (child) that was already stored in resfhp could be freed and later dereferenced.
We shouldn't call fh_compose() until we are certain that we have the final dentry, so this patch moved the fh_compose() call to two places: one for the case where the target already exists, and one after dentry_create() where it was created.
Linux >= 64a989dbd144e0622371396461b11335459692d2 < 033e783709ce99662cf81f6abcad746a8da9d35fLinux >= 64a989dbd144e0622371396461b11335459692d2 < 3e2c79360c6a89975ec5b5a7d4ef937e4db91a27Linux 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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