CVE-2025-39825
smb: client: fix race with concurrent opens in rename(2)
Vexday Risk Score
3Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS —EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
16 Sep 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
Affected products
Linux · LinuxWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://cert-portal.siemens.com/productcert/html/ssa-032379.htmlhttps://git.kernel.org/stable/c/24b9ed739c8c5b464d983e12cf308982f3ae93c2https://git.kernel.org/stable/c/289f945acb20b9b54fe4d13895e44aa58965ddb2https://git.kernel.org/stable/c/c9991af5e09924f6f3b3e6996a5e09f9504b4358https://git.kernel.org/stable/c/c9e7de284da0be5b44dbe79d71573f9f7f9b144chttps://git.kernel.org/stable/c/d84291fc7453df7881a970716f8256273aca5747https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html