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

Modified

AliasesUBUNTU-CVE-2025-39825DEBIAN-CVE-2025-39825

Published 16-09-2025Last modified 05-08-2026

Vulnerability summary

CVE-2025-39825 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

7.8/10

010

High · v3.1 (CVE.org)

EPSS score

0.12%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

16-09-2025
PublishedVulnerability first disclosed.
05-08-2026
Last modifiedVulnerability information updated.

Description

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 metrics

5 scores · 4 sources · 2 versions

v4.05.8v3.17.8

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.11% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu137 products

linuxAll versions (No fix recorded) | < 6.8.0-106.106
linux-allwinner-5.19All versions (No fix recorded)
linux-awsAll versions (No fix recorded) | < 6.8.0-1050.53
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)

linux-aws-5.13All versions (No fix recorded)
linux-aws-5.15All versions (No fix recorded)
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.14All versions (No fix recorded)
linux-aws-6.2All versions (No fix recorded)
linux-aws-6.5All versions (No fix recorded)
linux-aws-6.8< 6.8.0-1050.53~22.04.1
linux-aws-fipsAll versions (No fix recorded) | < 6.8.0-1050.53+fips1
linux-azureAll versions (No fix recorded) | < 6.8.0-1051.57
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15All versions (No fix recorded)
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.8All versions (No fix recorded)
linux-azure-6.11All versions (No fix recorded)
linux-azure-6.14All versions (No fix recorded)
linux-azure-6.2All versions (No fix recorded)
linux-azure-6.5All versions (No fix recorded)
linux-azure-6.8< 6.8.0-1051.57~22.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 6.8.0-1058.65
linux-azure-fde-5.15All versions (No fix recorded)
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fde-6.14All versions (No fix recorded)
linux-azure-fde-6.2All versions (No fix recorded)
linux-azure-fde-6.8< 6.8.0-1058.65~22.04.1
linux-azure-fipsAll versions (No fix recorded) | < 6.8.0-1052.58+fips1
linux-azure-nvidiaAll versions (No fix recorded)
linux-azure-nvidia-6.14All versions (No fix recorded)
linux-bluefieldAll versions (No fix recorded) | < 6.8.0-1017.21
linux-fipsAll versions (No fix recorded) | < 6.8.0-106.106+fips1
linux-gcpAll versions (No fix recorded) | < 6.8.0-1052.55
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15All versions (No fix recorded)
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.11All versions (No fix recorded)
linux-gcp-6.14All versions (No fix recorded)
linux-gcp-6.2All versions (No fix recorded)
linux-gcp-6.5All versions (No fix recorded)
linux-gcp-6.8< 6.8.0-1052.55~22.04.1
linux-gcp-fipsAll versions (No fix recorded) | < 6.8.0-1052.55+fips1
linux-gkeAll versions (No fix recorded) | < 6.8.0-1048.53
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeopAll versions (No fix recorded) | < 6.8.0-1035.38
linux-gkeop-5.15All versions (No fix recorded)
linux-gkeop-5.4All versions (No fix recorded)
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15All versions (No fix recorded)
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.11All versions (No fix recorded)
linux-hwe-6.14All versions (No fix recorded)
linux-hwe-6.2All versions (No fix recorded)
linux-hwe-6.5All versions (No fix recorded)
linux-hwe-6.8< 6.8.0-106.106~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibmAll versions (No fix recorded) | < 6.8.0-1049.49
linux-ibm-5.15All versions (No fix recorded)
linux-ibm-6.8< 6.8.0-1049.49~22.04.1
linux-intelAll versions (No fix recorded)
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-intel-iotgAll versions (No fix recorded)
linux-intel-iotg-5.15All versions (No fix recorded)
linux-kvmAll versions (No fix recorded)
linux-lowlatencyAll versions (No fix recorded) | < 6.8.0-106.106.1
linux-lowlatency-hwe-5.15All versions (No fix recorded)
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.11All versions (No fix recorded)
linux-lowlatency-hwe-6.2All versions (No fix recorded)
linux-lowlatency-hwe-6.5All versions (No fix recorded)
linux-lowlatency-hwe-6.8< 6.8.0-106.106.1~22.04.1
linux-nvidiaAll versions (No fix recorded) | < 6.8.0-1049.52
linux-nvidia-6.11All versions (No fix recorded)
linux-nvidia-6.2All versions (No fix recorded)
linux-nvidia-6.5All versions (No fix recorded)
linux-nvidia-6.8< 6.8.0-1049.52~22.04.1
linux-nvidia-lowlatency< 6.8.0-1049.52.1
linux-nvidia-tegraAll versions (No fix recorded) | < 6.8.0-1020.20
linux-nvidia-tegra-5.15All versions (No fix recorded)
linux-nvidia-tegra-igxAll versions (No fix recorded)
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0All versions (No fix recorded)
linux-oem-6.1All versions (No fix recorded)
linux-oem-6.11All versions (No fix recorded)
linux-oem-6.14All versions (No fix recorded)
linux-oem-6.5All versions (No fix recorded)
linux-oem-6.8All versions (No fix recorded)
linux-oracleAll versions (No fix recorded) | < 6.8.0-1047.48
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.8All versions (No fix recorded)
linux-oracle-6.14All versions (No fix recorded)
linux-oracle-6.5All versions (No fix recorded)
linux-oracle-6.8< 6.8.0-1047.48~22.04.1
linux-raspiAll versions (No fix recorded) | < 6.8.0-1050.54
linux-raspi-realtimeAll versions (No fix recorded) | < 6.8.0-2040.41
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 6.8.1-1045.46
linux-realtime-6.14All versions (No fix recorded)
linux-realtime-6.8< 6.8.1-1045.46~22.04.1
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15All versions (No fix recorded)
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-riscv-6.14All versions (No fix recorded)
linux-riscv-6.5All versions (No fix recorded)
linux-riscv-6.8< 6.8.0-106.106~22.04.1
linux-starfive-5.19All versions (No fix recorded)
linux-starfive-6.2All versions (No fix recorded)
linux-starfive-6.5All versions (No fix recorded)
linux-xilinx< 6.8.0-1028.29
linux-xilinx-zynqmpAll versions (No fix recorded)

Show all 137

Debian2 products

linux< 6.1.153-1 | < 6.12.48-1 | < 6.16.5-1
debian_linuxEOL11.0

Linux2 products

linux≥ 78c09634f7dc061a3bd09704cdbebb3762a45cdf, < c9e7de284da0be5b44dbe79d71573f9f7f9b144c | ≥ 78c09634f7dc061a3bd09704cdbebb3762a45cdf, < 24b9ed739c8c5b464d983e12cf308982f3ae93c2 | ≥ 78c09634f7dc061a3bd09704cdbebb3762a45cdf, < c9991af5e09924f6f3b3e6996a5e09f9504b4358 | ≥ 78c09634f7dc061a3bd09704cdbebb3762a45cdf, < 289f945acb20b9b54fe4d13895e44aa58965ddb2 | ≥ 78c09634f7dc061a3bd09704cdbebb3762a45cdf, < d84291fc7453df7881a970716f8256273aca5747 | 5.13
linux_kernel≥ 5.13, < 6.1.150 | ≥ 6.2, < 6.6.104 | ≥ 6.7, < 6.12.45 | ≥ 6.13, < 6.16.5 | 6.17:rc1

3 vendors · 141 products