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CVE-2026-98451

HIGHCVSS 8.8/10EPSS 0.35%

Last modified

CVE-2026-98451 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: smb: client: use finish_no_open() for non-regular inodes An O_CREAT open can find an existing symlink or another non-regular inode. cifs_atomic_open() calls finish_open() on it and attaches a cifsFileInfo. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: use finish_no_open() for non-regular inodes An O_CREAT open can find an existing symlink or another non-regular inode. cifs_atomic_open() calls finish_open() on it and attaches a cifsFileInfo. Symlink inodes have no CIFS release operation, so the dentry reference held by cifsFileInfo is leaked. FMODE_OPENED also prevents the VFS from following the symlink. Track whether cifs_do_create() returned an open server handle. For non-regular inodes, close the handle if present, remove the pending open, and call finish_no_open() so the VFS can continue the lookup. Do not set FMODE_CREATED unless a regular file was opened. For O_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's -EFTYPE check. Defer closing a legacy POSIX handle on a non-regular inode until after inode lookup. This avoids closing it again if lookup fails.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability
0.35%

29.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < bc585d5a381ab49cb611c35dda93a997214ca874; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < 26f4bca335e719e291995e28dc434de0145a6a54; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < 51c7b0593f6eaba05349fd2a01a9cb4df7d7412f; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < 045532f920d86dd76600b635f9756e5fd671ddfc; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < ed03d547598c92a036f20e89156540995cac889a; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < 70a7918fda54a06d836acc91eb9a3c7e860fe0a0; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < 3c07deb26273155c180aedfd9041ab58015d2521; >= d2c127197dfc0b2bae62a52e1e0d3e3ff493919e, < e66cf1625ec4a3fe68346119f371def713fd0a4d
LinuxLinux3.6

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98451?
In the Linux kernel, the following vulnerability has been resolved: smb: client: use finish_no_open() for non-regular inodes An O_CREAT open can find an existing symlink or another non-regular inode. cifs_atomic_open() calls finish_open() on it and attaches a cifsFileInfo. Symlink inodes have no CIFS release operation, so the dentry reference held by cifsFileInfo is leaked. FMODE_OPENED also prevents the VFS from following the symlink. Track whether cifs_do_create() returned an open server handle. For non-regular inodes, close the handle if present, remove the pending open, and call finish_no_open() so the VFS can continue the lookup. Do not set FMODE_CREATED unless a regular file was opened. For O_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's -EFTYPE check. Defer closing a legacy POSIX handle on a non-regular inode until after inode lookup. This avoids closing it again if lookup fails.
How severe is CVE-2026-98451?
CVE-2026-98451 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98451?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST