CVE-2026-89677
CVE CVE-2026-89677EUVD EUVD-2026-76589Published 2026-09-11T19:46:01.000ZLast changed 2026-09-13T06:32:59.000ZCVSS 9.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 64a989dbd144e0622371396461b11335459692d2 <033e783709ce99662cf81f6abcad746a8da9d35f; patch: 0; 7.0; patch: 7.3-rc1; patch: 7.2.4; 64a989dbd144e0622371396461b11335459692d2 <3e2c79360c6a89975ec5b5a7d4ef937e4db91a27
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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