CVE-2026-89701nfsd: validate nseconds in TIME_DELEG decode paths
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: nfsd: validate nseconds in TIME_DELEG decode paths The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms store a raw uint32_t nseconds directly into tv_nsec without enforcing nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this check but the TIME_DELEG paths do not. A malformed timespec can propagate through notify_change() to disk. Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB_GETATTR path).
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 6ae30d6eb26bce02c48c60074b4306270e2434c1 before 7e7b93da7fa2e77f977096251899d1410986adf6; 6ae30d6eb26bce02c48c60074b4306270e2434c1 builds before 5eb489831a9fd4754f4baf26e6989efb66ce104c; 6ae30d6eb26bce02c48c60074b4306270e2434c1 builds before 0f4a767340fad392bd656115b8752005518c9065 | CNA record |
References
- https://git.kernel.org/stable/c/7e7b93da7fa2e77f977096251899d1410986adf6
- https://git.kernel.org/stable/c/5eb489831a9fd4754f4baf26e6989efb66ce104c
- https://git.kernel.org/stable/c/0f4a767340fad392bd656115b8752005518c9065
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.