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Fencer Vulns
high 8.8

CVE-2025-39849 json

wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()

published 2025-09-19 13 mo ago modified 2026-10-19 20 d ago also EUVD-2025-30351

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()

If the ssid->datalen is more than IEEE80211_MAX_SSID_LEN (32) it would lead to memory corruption so add some bounds checking.

Patch / fix

  • Linux Linux 6.1.151, 6.3, 6.6.105, 6.12.46, 6.16.6, 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 6.16.6-1

debian advisories DEBIAN-CVE-2025-39849

  • 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-2025-39849

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 RHEL 10.1 6.12.0-124.9.1.el10_1
  • rv RHEL 10.1 6.12.0-124.9.1.el10_1
  • perf RHEL 10.1 6.12.0-124.9.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.9.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.9.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.9.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.9.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.9.1.el10_1

red hat advisories RHSA-2025:21760RHSA-2025:21118RHSA-2025:21112RHSA-2025:19106RHSA-2025:19103RHSA-2025:19102

  • 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-2025:4141-1SUSE-SU-2025:4132-1

  • 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 AlmaLinux 8 4.18.0-553.81.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.81.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.81.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.81.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.81.1.el8_10

almalinux advisories ALSA-2025:19102ALSA-2025:19103ALSA-2025:18281

  • kernel Rocky Linux 10 6.12.0-55.41.1.el10_0
  • kernel-rt Rocky Linux 8 4.18.0-553.81.1.rt7.422.el8_10
  • kernel Rocky Linux 8 4.18.0-553.81.1.el8_10

rocky linux advisories RLSA-2025:19106RLSA-2025:19103RLSA-2025:19102

  • kernel Azure Linux 3.0 6.6.112.1-1

azure linux advisories AZL-67520

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-2025-39849 updated cvss 7.5

kernel: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • 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
    affected: workaround, no fix available “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.100.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.100.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.100.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.100.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.100.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:21760
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.7.1.el9_7, rv 5.14.0-570.55.1.el9_6, perf 5.14.0-611.7.1.el9_7, rtla 5.14.0-611.7.1.el9_7, perf 5.14.0-570.55.1.el9_6, rtla 5.14.0-570.55.1.el9_6, +20 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:18281
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.9.1.el10_1, rv 6.12.0-55.41.1.el10_0, perf 6.12.0-124.9.1.el10_1, perf 6.12.0-55.41.1.el10_0, rtla 6.12.0-124.9.1.el10_1, rtla 6.12.0-55.41.1.el10_0, +20 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19106
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.100.1.el9_4, perf 5.14.0-427.100.1.el9_4, rtla 5.14.0-427.100.1.el9_4, kernel-devel-matched 5.14.0-427.100.1.el9_4, kernel-64k-devel-matched 5.14.0-427.100.1.el9_4, kernel-debug-devel-matched 5.14.0-427.100.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:21760
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.81.1.el8_10, kernel 4.18.0-553.81.1.el8_10, bpftool 4.18.0-553.81.1.el8_10, kernel-core 4.18.0-553.81.1.el8_10, kernel-tools 4.18.0-553.81.1.el8_10, python3-perf 4.18.0-553.81.1.el8_10, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19102
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.7.1.el9_7, kernel 5.14.0-570.55.1.el9_6, kernel-64k 5.14.0-611.7.1.el9_7, kernel-64k 5.14.0-570.55.1.el9_6, kernel-core 5.14.0-611.7.1.el9_7, kernel-core 5.14.0-570.55.1.el9_6, +60 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:18281
show 14 more
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.9.1.el10_1, kernel 6.12.0-55.41.1.el10_0, kernel-64k 6.12.0-124.9.1.el10_1, kernel-64k 6.12.0-55.41.1.el10_0, kernel-core 6.12.0-124.9.1.el10_1, kernel-core 6.12.0-55.41.1.el10_0, +61 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19106
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.100.1.el9_4, kernel 5.14.0-427.100.1.el9_4, kernel-64k 5.14.0-427.100.1.el9_4, kernel-core 5.14.0-427.100.1.el9_4, kernel-tools 5.14.0-427.100.1.el9_4, python3-perf 5.14.0-427.100.1.el9_4, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:21760
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.7.1.el9_7, libperf 5.14.0-570.55.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-611.7.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-570.55.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-611.7.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.7.1.el9_7, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:18281
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.9.1.el10_1, libperf 6.12.0-55.41.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-124.9.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-55.41.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-124.9.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-55.41.1.el10_0, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19106
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.81.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.81.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.81.1.el8_10
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19102
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-kvm 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-core 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-modules 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-kvm 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-core 4.18.0-553.81.1.rt7.422.el8_10, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19103
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.7.1.el9_7, kernel-rt 5.14.0-570.55.1.el9_6, kernel-rt-64k 5.14.0-611.7.1.el9_7, kernel-rt-64k 5.14.0-570.55.1.el9_6, kernel-rt-core 5.14.0-611.7.1.el9_7, kernel-rt-core 5.14.0-570.55.1.el9_6, +34 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:18281
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.9.1.el10_1, kernel-rt 6.12.0-55.41.1.el10_0, kernel-rt-64k 6.12.0-124.9.1.el10_1, kernel-rt-64k 6.12.0-55.41.1.el10_0, kernel-rt-core 6.12.0-124.9.1.el10_1, kernel-rt-core 6.12.0-55.41.1.el10_0, +34 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19106
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.100.1.el9_4, kernel-rt-core 5.14.0-427.100.1.el9_4, kernel-rt-modules 5.14.0-427.100.1.el9_4, kernel-rt-debug-core 5.14.0-427.100.1.el9_4, kernel-rt-modules-core 5.14.0-427.100.1.el9_4, kernel-rt-debug-modules 5.14.0-427.100.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:21760
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.7.1.el9_7, kernel-rt 5.14.0-570.55.1.el9_6, kernel-rt-core 5.14.0-611.7.1.el9_7, kernel-rt-kvm 5.14.0-570.55.1.el9_6, kernel-rt-core 5.14.0-570.55.1.el9_6, kernel-rt-modules 5.14.0-611.7.1.el9_7, +16 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:18281
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.9.1.el10_1, kernel-rt 6.12.0-55.41.1.el10_0, kernel-rt-kvm 6.12.0-55.41.1.el10_0, kernel-rt-core 6.12.0-124.9.1.el10_1, kernel-rt-core 6.12.0-55.41.1.el10_0, kernel-rt-modules 6.12.0-124.9.1.el10_1, +16 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19106
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.100.1.el9_4, kernel-rt-kvm 5.14.0-427.100.1.el9_4, kernel-rt-core 5.14.0-427.100.1.el9_4, kernel-rt-modules 5.14.0-427.100.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.100.1.el9_4, kernel-rt-debug-core 5.14.0-427.100.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:21760
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-core 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-modules 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-core 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-debug-modules 4.18.0-553.81.1.rt7.422.el8_10, kernel-rt-modules-extra 4.18.0-553.81.1.rt7.422.el8_10, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cfg80211 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2025:19103
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    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
total
Assessed
4 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC CN 4100

Classification

Weakness
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.