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Fencer Vulns
high 7.8

CVE-2025-39825 json

smb: client: fix race with concurrent opens in rename(2)

published 2025-09-16 13 mo ago modified 2026-10-19 20 d ago also EUVD-2025-29589

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.1.150, 6.6.104, 6.12.45, 6.16.5, 6.17
  • Siemens SIMATIC CN 4100 V5.0
  • linux Debian 12 6.1.153-1
  • linux Debian 13 6.12.48-1
  • linux Debian 14 6.16.5-1

debian advisories DEBIAN-CVE-2025-39825

  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1048.53
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1049.49
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1051.57
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1035.38
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1050.54

ubuntu advisories UBUNTU-CVE-2025-39825

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.87.1.rt7.428.el8_10

red hat advisories RHSA-2026:0576RHSA-2026:0537RHSA-2026:0535RHSA-2026:0533RHSA-2026:0534RHSA-2026:0532

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1SUSE-SU-2025:20870-1SUSE-SU-2025:20898-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel-rt AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel AlmaLinux 8 4.18.0-553.87.1.el8_10

almalinux advisories ALSA-2025:22387ALSA-2025:22388

  • kernel-rt Rocky Linux 8 4.18.0-553.87.1.rt7.428.el8_10
  • kernel Rocky Linux 8 4.18.0-553.87.1.el8_10

rocky linux advisories RLSA-2025:22387RLSA-2025:22388

  • kernel Azure Linux 3.0 6.6.104.2-1

azure linux advisories AZL-67386

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-39825 updated cvss 7.0

kernel: smb: client: fix race with concurrent opens in rename(2)

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more Red Hat Enterprise Linux 10 kernel
    affected: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.106.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.106.1.el9_4
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.41.1.el9_6, perf 5.14.0-570.41.1.el9_6, rtla 5.14.0-570.41.1.el9_6, python3-perf 5.14.0-570.41.1.el9_6, kernel-devel-matched 5.14.0-570.41.1.el9_6, kernel-64k-devel-matched 5.14.0-570.41.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:15429
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.161.1.el9_0, kernel-devel-matched 5.14.0-70.161.1.el9_0, kernel-debug-devel-matched 5.14.0-70.161.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.161.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.161.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.161.1.el9_0, +2 more
    fixed: vendor fix RHSA-2026:0576
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-devel-matched 5.14.0-284.152.1.el9_2, kernel-64k-devel-matched 5.14.0-284.152.1.el9_2, kernel-debug-devel-matched 5.14.0-284.152.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.152.1.el9_2, kernel-zfcpdump-devel-matched 5.14.0-284.152.1.el9_2, kernel-64k-debug-devel-matched 5.14.0-284.152.1.el9_2, +3 more
    fixed: vendor fix RHSA-2026:0535
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.106.1.el9_4, perf 5.14.0-427.106.1.el9_4, rtla 5.14.0-427.106.1.el9_4, kernel-devel-matched 5.14.0-427.106.1.el9_4, kernel-64k-devel-matched 5.14.0-427.106.1.el9_4, kernel-debug-devel-matched 5.14.0-427.106.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.87.1.el8_10, kernel 4.18.0-553.87.1.el8_10, bpftool 4.18.0-553.87.1.el8_10, kernel-core 4.18.0-553.87.1.el8_10, kernel-tools 4.18.0-553.87.1.el8_10, python3-perf 4.18.0-553.87.1.el8_10, +15 more
    fixed: vendor fix RHSA-2025:22388
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.41.1.el9_6, kernel-64k 5.14.0-570.41.1.el9_6, kernel-core 5.14.0-570.41.1.el9_6, kernel-tools 5.14.0-570.41.1.el9_6, kernel-modules 5.14.0-570.41.1.el9_6, kernel-64k-core 5.14.0-570.41.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:15429
show 23 more
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.178.1.el8_2, kernel 4.18.0-193.178.1.el8_2, bpftool 4.18.0-193.178.1.el8_2, kernel-core 4.18.0-193.178.1.el8_2, kernel-tools 4.18.0-193.178.1.el8_2, python3-perf 4.18.0-193.178.1.el8_2, +8 more
    fixed: vendor fix RHSA-2025:23445
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.183.1.el8_4, kernel 4.18.0-305.183.1.el8_4, bpftool 4.18.0-305.183.1.el8_4, kernel-core 4.18.0-305.183.1.el8_4, kernel-tools 4.18.0-305.183.1.el8_4, python3-perf 4.18.0-305.183.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:0533
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.173.1.el8_6, kernel 4.18.0-372.173.1.el8_6, bpftool 4.18.0-372.173.1.el8_6, kernel-core 4.18.0-372.173.1.el8_6, kernel-tools 4.18.0-372.173.1.el8_6, python3-perf 4.18.0-372.173.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.173.1.el8_6, kernel 4.18.0-372.173.1.el8_6, bpftool 4.18.0-372.173.1.el8_6, kernel-core 4.18.0-372.173.1.el8_6, kernel-tools 4.18.0-372.173.1.el8_6, python3-perf 4.18.0-372.173.1.el8_6, +15 more
    fixed: vendor fix RHSA-2025:23425
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.124.1.el8_8, kernel 4.18.0-477.124.1.el8_8, bpftool 4.18.0-477.124.1.el8_8, kernel-core 4.18.0-477.124.1.el8_8, kernel-tools 4.18.0-477.124.1.el8_8, python3-perf 4.18.0-477.124.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:0532
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.161.1.el9_0, bpftool 5.14.0-70.161.1.el9_0, kernel-core 5.14.0-70.161.1.el9_0, kernel-tools 5.14.0-70.161.1.el9_0, python3-perf 5.14.0-70.161.1.el9_0, kernel-modules 5.14.0-70.161.1.el9_0, +14 more
    fixed: vendor fix RHSA-2026:0576
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.152.1.el9_2, kernel 5.14.0-284.152.1.el9_2, kernel-64k 5.14.0-284.152.1.el9_2, kernel-core 5.14.0-284.152.1.el9_2, kernel-tools 5.14.0-284.152.1.el9_2, kernel-modules 5.14.0-284.152.1.el9_2, +27 more
    fixed: vendor fix RHSA-2026:0535
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.106.1.el9_4, kernel 5.14.0-427.106.1.el9_4, kernel-64k 5.14.0-427.106.1.el9_4, kernel-core 5.14.0-427.106.1.el9_4, kernel-tools 5.14.0-427.106.1.el9_4, python3-perf 5.14.0-427.106.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.183.1.el8_4, kernel 4.18.0-305.183.1.el8_4, bpftool 4.18.0-305.183.1.el8_4, kernel-core 4.18.0-305.183.1.el8_4, kernel-tools 4.18.0-305.183.1.el8_4, python3-perf 4.18.0-305.183.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:0533
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.173.1.el8_6, kernel 4.18.0-372.173.1.el8_6, bpftool 4.18.0-372.173.1.el8_6, kernel-core 4.18.0-372.173.1.el8_6, kernel-tools 4.18.0-372.173.1.el8_6, python3-perf 4.18.0-372.173.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:23425
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.124.1.el8_8, kernel 4.18.0-477.124.1.el8_8, bpftool 4.18.0-477.124.1.el8_8, kernel-core 4.18.0-477.124.1.el8_8, kernel-tools 4.18.0-477.124.1.el8_8, python3-perf 4.18.0-477.124.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:0532
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.41.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.41.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.41.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.41.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.41.1.el9_6
    fixed: vendor fix RHSA-2025:15429
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.87.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.87.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.87.1.el8_10
    fixed: vendor fix RHSA-2025:22388
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-kvm 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-core 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-modules 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-kvm 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-core 4.18.0-553.87.1.rt7.428.el8_10, +4 more
    fixed: vendor fix RHSA-2025:22387
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-kvm 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-core 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-modules 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-kvm 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-core 5.14.0-70.161.1.rt21.233.el9_0, +4 more
    fixed: vendor fix RHSA-2026:0537
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.41.1.el9_6, kernel-rt-64k 5.14.0-570.41.1.el9_6, kernel-rt-core 5.14.0-570.41.1.el9_6, kernel-rt-modules 5.14.0-570.41.1.el9_6, kernel-rt-64k-core 5.14.0-570.41.1.el9_6, kernel-rt-debug-core 5.14.0-570.41.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:15429
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-core 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-modules 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-core 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-modules 5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-modules-extra 5.14.0-70.161.1.rt21.233.el9_0, +2 more
    fixed: vendor fix RHSA-2026:0537
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-modules 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-modules-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-modules 5.14.0-284.152.1.rt14.437.el9_2, +4 more
    fixed: vendor fix RHSA-2026:0534
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.106.1.el9_4, kernel-rt-core 5.14.0-427.106.1.el9_4, kernel-rt-modules 5.14.0-427.106.1.el9_4, kernel-rt-debug-core 5.14.0-427.106.1.el9_4, kernel-rt-modules-core 5.14.0-427.106.1.el9_4, kernel-rt-debug-modules 5.14.0-427.106.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.41.1.el9_6, kernel-rt-kvm 5.14.0-570.41.1.el9_6, kernel-rt-core 5.14.0-570.41.1.el9_6, kernel-rt-modules 5.14.0-570.41.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.41.1.el9_6, kernel-rt-debug-core 5.14.0-570.41.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:15429
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-kvm 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-modules 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-kvm 5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-core 5.14.0-284.152.1.rt14.437.el9_2, +6 more
    fixed: vendor fix RHSA-2026:0534
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.106.1.el9_4, kernel-rt-kvm 5.14.0-427.106.1.el9_4, kernel-rt-core 5.14.0-427.106.1.el9_4, kernel-rt-modules 5.14.0-427.106.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.106.1.el9_4, kernel-rt-debug-core 5.14.0-427.106.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:0489
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-core 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-modules 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-core 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-debug-modules 4.18.0-553.87.1.rt7.428.el8_10, kernel-rt-modules-extra 4.18.0-553.87.1.rt7.428.el8_10, +2 more
    fixed: vendor fix RHSA-2025:22387
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.152.1.el9_2, rtla 5.14.0-284.152.1.el9_2 Red Hat Enterprise Linux BaseOS E4S (v.9.2) python3-perf 5.14.0-284.152.1.el9_2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC CN 4100

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.