CVE-2025-39702 in the critical feed json
ipv6: sr: Fix MAC comparison to be constant-time
published 2025-09-05 14 mo ago modified 2026-10-19 20 d ago also EUVD-2025-31524
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: sr: Fix MAC comparison to be constant-time
To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
Patch / fix
- Linux Linux 5.10.249, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4, 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-2025-39702
- linux Ubuntu 22.04 LTS 5.15.0-163.173
- linux Ubuntu 24.04 LTS 6.8.0-100.100
- linux-aws Ubuntu 22.04 LTS 5.15.0-1097.104
- linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1097.106
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
- linux-gke Ubuntu 22.04 LTS 5.15.0-1093.99
- linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48
ubuntu advisories UBUNTU-CVE-2025-39702
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-2025:22124RHSA-2025:22095RHSA-2025:21760RHSA-2025:21136RHSA-2025:21118RHSA-2025:21112
- kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.58.1
- kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.58.1
- kernel-rt_debug Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.58.1
- kernel-source-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.58.1
- kernel-rt Linux Micro 6.2 6.12.0-160000.7.1
- kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.7.1
- kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.7.1
- kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.7.1
suse advisories SUSE-SU-2025:4301-1SUSE-SU-2025:21080-1SUSE-SU-2025:21147-1SUSE-SU-2025:21180-1SUSE-SU-2026:20561-1SUSE-SU-2025:21052-1
- kernel-rt openSUSE Leap 16.0 6.12.0-160000.7.1
- dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.7.1
- kernel-64kb openSUSE Leap 16.0 6.12.0-160000.7.1
- kernel-syms openSUSE Leap 16.0 6.12.0-160000.7.1
- kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.7.1
- kernel-source openSUSE Leap 16.0 6.12.0-160000.7.1
- kernel-default openSUSE Leap 16.0 6.12.0-160000.7.1
- kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.7.1
opensuse advisories openSUSE-SU-2025:20091-1
- kernel AlmaLinux 9 5.14.0-570.60.1.el9_6
- rv AlmaLinux 9 5.14.0-570.60.1.el9_6
- perf AlmaLinux 9 5.14.0-570.60.1.el9_6
- rtla AlmaLinux 9 5.14.0-570.60.1.el9_6
- libperf AlmaLinux 9 5.14.0-570.60.1.el9_6
- kernel-rt AlmaLinux 9 5.14.0-570.60.1.el9_6
- kernel-64k AlmaLinux 9 5.14.0-570.60.1.el9_6
- kernel-core AlmaLinux 9 5.14.0-570.60.1.el9_6
almalinux advisories ALSA-2025:19409ALSA-2025:19469
- kernel Azure Linux 3.0 6.6.104.2-1
- kernel CBL-Mariner 2.0 5.15.200.1-1
azure linux advisories AZL-66941AZL-73719
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
- git.kernel.org/stable/c/ff55a452d56490047f5233cc48c5d933f8586884 commit
- git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0 commit
- git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831 commit
- git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3 commit
- git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7 commit
- git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a commit
- git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa commit
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-2025-39702 updated cvss 7.1
kernel: ipv6: sr: Fix MAC comparison to be constant-time
-
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 moreaffected: no fix available
-
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_4fixed: vendor fix RHSA-2025:21760
-
Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.7.1.el9_7, rv 5.14.0-570.60.1.el9_6, perf 5.14.0-611.7.1.el9_7, rtla 5.14.0-611.7.1.el9_7, perf 5.14.0-570.60.1.el9_6, rtla 5.14.0-570.60.1.el9_6, +20 morefixed: vendor fix RHSA-2025:19409
-
Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.9.1.el10_1, rv 6.12.0-55.42.1.el10_0, perf 6.12.0-124.9.1.el10_1, perf 6.12.0-55.42.1.el10_0, rtla 6.12.0-124.9.1.el10_1, rtla 6.12.0-55.42.1.el10_0, +20 morefixed: vendor fix RHSA-2025:19469
-
Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.153.1.el9_0, kernel-devel-matched 5.14.0-70.153.1.el9_0, kernel-debug-devel-matched 5.14.0-70.153.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.153.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.153.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.153.1.el9_0, +2 morefixed: vendor fix RHSA-2025:21091
-
Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.148.1.el9_2, rtla 5.14.0-284.148.1.el9_2, kernel-devel-matched 5.14.0-284.148.1.el9_2, kernel-64k-devel-matched 5.14.0-284.148.1.el9_2, kernel-debug-devel-matched 5.14.0-284.148.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.148.1.el9_2, +5 morefixed: vendor fix RHSA-2025:22095
-
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 morefixed: vendor fix RHSA-2025:21760
-
Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.7.1.el9_7, kernel 5.14.0-570.60.1.el9_6, kernel-64k 5.14.0-611.7.1.el9_7, kernel-64k 5.14.0-570.60.1.el9_6, kernel-core 5.14.0-611.7.1.el9_7, kernel-core 5.14.0-570.60.1.el9_6, +60 morefixed: vendor fix RHSA-2025:19409
show 17 moreshow fewer
-
Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.9.1.el10_1, kernel 6.12.0-55.42.1.el10_0, kernel-64k 6.12.0-124.9.1.el10_1, kernel-64k 6.12.0-55.42.1.el10_0, kernel-core 6.12.0-124.9.1.el10_1, kernel-core 6.12.0-55.42.1.el10_0, +61 morefixed: vendor fix RHSA-2025:19469
-
Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.153.1.el9_0, bpftool 5.14.0-70.153.1.el9_0, kernel-core 5.14.0-70.153.1.el9_0, kernel-tools 5.14.0-70.153.1.el9_0, python3-perf 5.14.0-70.153.1.el9_0, kernel-modules 5.14.0-70.153.1.el9_0, +14 morefixed: vendor fix RHSA-2025:21091
-
Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.148.1.el9_2, kernel 5.14.0-284.148.1.el9_2, kernel-64k 5.14.0-284.148.1.el9_2, kernel-core 5.14.0-284.148.1.el9_2, kernel-tools 5.14.0-284.148.1.el9_2, python3-perf 5.14.0-284.148.1.el9_2, +28 morefixed: vendor fix RHSA-2025:22095
-
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 morefixed: vendor fix RHSA-2025:21760
-
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.7.1.el9_7, libperf 5.14.0-570.60.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-611.7.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-570.60.1.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 morefixed: vendor fix RHSA-2025:19409
-
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.9.1.el10_1, libperf 6.12.0-55.42.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-124.9.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-55.42.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-124.9.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-55.42.1.el10_0, +4 morefixed: vendor fix RHSA-2025:19469
-
Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-kvm 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-core 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-modules 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-kvm 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-core 5.14.0-70.153.1.rt21.225.el9_0, +4 morefixed: vendor fix RHSA-2025:21136
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Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.7.1.el9_7, kernel-rt 5.14.0-570.60.1.el9_6, kernel-rt-64k 5.14.0-611.7.1.el9_7, kernel-rt-64k 5.14.0-570.60.1.el9_6, kernel-rt-core 5.14.0-611.7.1.el9_7, kernel-rt-core 5.14.0-570.60.1.el9_6, +34 morefixed: vendor fix RHSA-2025:19409
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Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.9.1.el10_1, kernel-rt 6.12.0-55.42.1.el10_0, kernel-rt-64k 6.12.0-124.9.1.el10_1, kernel-rt-64k 6.12.0-55.42.1.el10_0, kernel-rt-core 6.12.0-124.9.1.el10_1, kernel-rt-core 6.12.0-55.42.1.el10_0, +34 morefixed: vendor fix RHSA-2025:19469
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Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-core 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-modules 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-core 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-debug-modules 5.14.0-70.153.1.rt21.225.el9_0, kernel-rt-modules-extra 5.14.0-70.153.1.rt21.225.el9_0, +2 morefixed: vendor fix RHSA-2025:21136
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Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-modules 5.14.0-284.148.1.rt14.433.el9_2, +4 morefixed: vendor fix RHSA-2025:22124
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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 morefixed: vendor fix RHSA-2025:21760
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Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.7.1.el9_7, kernel-rt 5.14.0-570.60.1.el9_6, kernel-rt-core 5.14.0-611.7.1.el9_7, kernel-rt-kvm 5.14.0-570.60.1.el9_6, kernel-rt-core 5.14.0-570.60.1.el9_6, kernel-rt-modules 5.14.0-611.7.1.el9_7, +16 morefixed: vendor fix RHSA-2025:19409
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Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.9.1.el10_1, kernel-rt 6.12.0-55.42.1.el10_0, kernel-rt-kvm 6.12.0-55.42.1.el10_0, kernel-rt-core 6.12.0-124.9.1.el10_1, kernel-rt-core 6.12.0-55.42.1.el10_0, kernel-rt-modules 6.12.0-124.9.1.el10_1, +16 morefixed: vendor fix RHSA-2025:19469
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Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-kvm 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-modules 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-kvm 5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-core 5.14.0-284.148.1.rt14.433.el9_2, +6 morefixed: vendor fix RHSA-2025:22124
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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 morefixed: vendor fix RHSA-2025:21760
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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 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 morenot 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 ICSA-26-134-10 updated cvss 7.1
Siemens SIMATIC
-
Siemens SIMATIC CN 4100 < 5.0affected: fixed in V5.0 support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 24 d ago
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
- Siemens SIMATIC CN 4100
Classification
- Weakness
-
- CWE-203 Observable Discrepancy
- Technology feeds
References
-
git.kernel.org
/stable/c/ff55a452d56490047f5233cc48c5d933f8586884
patch
-
git.kernel.org
/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
patch
-
git.kernel.org
/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831
patch
-
git.kernel.org
/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
patch
-
git.kernel.org
/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7
patch
-
git.kernel.org
/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a
patch
-
git.kernel.org
/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa
patch
-
lists.debian.org
/debian-lts-announce/2025/10/msg00008.html
mailing-list, third-party-advisory
- cert-portal.siemens.com /productcert/html/ssa-032379.html
Sources
- CVE List CVE-2025-39702
- NVD CVE-2025-39702
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.