High 7.8Published Sep 16, 2025

CVE-2025-39825smb: client: fix race with concurrent opens in rename(2)

Updated under an hour ago (Oct 27, 2026, 9:23 AM ET)

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It affects Linux and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix race with concurrent opens in rename(2) Besides sending the rename request to the server, the rename process also involves closing any deferred close, waiting for outstanding I/O to complete as well as marking all existing open handles as deleted to prevent them from deferring closes, which increases the race window for potential concurrent opens on the target file. Fix this by unhashing the dentry in advance to prevent any concurrent opens on the target.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 78c09634f7dc061a3bd09704cdbebb3762a45cdf before c9e7de284da0be5b44dbe79d71573f9f7f9b144c; 78c09634f7dc061a3bd09704cdbebb3762a45cdf builds before 24b9ed739c8c5b464d983e12cf308982f3ae93c2; from 78c09634f7dc061a3bd09704cdbebb3762a45cdf before c9991af5e09924f6f3b3e6996a5e09f9504b4358; from 78c09634f7dc061a3bd09704cdbebb3762a45cdf before 289f945acb20b9b54fe4d13895e44aa58965ddb2; from 78c09634f7dc061a3bd09704cdbebb3762a45cdf before d84291fc7453df7881a970716f8256273aca5747	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.13 before 6.1.150; from 6.2 before 6.6.104; from 6.7 before 6.12.45; from 6.13 before 6.16.5; 6.17	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/c9e7de284da0be5b44dbe79d71573f9f7f9b144c	patch
https://git.kernel.org/stable/c/24b9ed739c8c5b464d983e12cf308982f3ae93c2	patch
https://git.kernel.org/stable/c/c9991af5e09924f6f3b3e6996a5e09f9504b4358	patch
https://git.kernel.org/stable/c/289f945acb20b9b54fe4d13895e44aa58965ddb2	patch
https://git.kernel.org/stable/c/d84291fc7453df7881a970716f8256273aca5747	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-032379.html

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.