Bug 2532154 (CVE-2026-89701) - CVE-2026-89701 kernel: Linux Kernel: Data integrity issue in nfsd due to improper timestamp validation
Summary: CVE-2026-89701 kernel: Linux Kernel: Data integrity issue in nfsd due to impr...
Keywords:
Status: NEW
Alias: CVE-2026-89701
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-11 20:59 UTC by OSIDB Bzimport
Modified: 2026-09-15 04:40 UTC (History)
15 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-11 20:59:33 UTC 
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).
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