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Fencer Intel
high 7.8

CVE-2025-38572 json

ipv6: reject malicious packets in ipv6_gso_segment()

published last yr. modified 3mo ago also EUVD-2025-26102

cvss
7.8
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 10%
public exploits
0
none known

Summary

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

ipv6: reject malicious packets in ipv6_gso_segment()

syzbot was able to craft a packet with very long IPv6 extension headers leading to an overflow of skb->transport_header.

This 16bit field has a limited range.

Add skb_reset_transport_header_careful() helper and use it from ipv6_gso_segment()

WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 skb_reset_transport_header include/linux/skbuff.h:3032 [inline] WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151 Modules linked in: CPU: 0 UID: 0 PID: 5871 Comm: syz-executor211 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:skb_reset_transport_header include/linux/skbuff.h:3032 [inline] RIP: 0010:ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151 Call Trace: <TASK> skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53 nsh_gso_segment+0x54a/0xe10 net/nsh/nsh.c:110 skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53 __skb_gso_segment+0x342/0x510 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0x857/0x11b0 net/core/dev.c:3950 validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4000 sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:329 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4679

Patch / fix

  • Linux Linux 5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102, 6.12.42, 6.15.10, 6.16.1, 6.17
  • linux Debian 12 6.1.148-1
  • linux Debian 13 6.12.43-1
  • linux Debian 14 6.16.3-1

debian advisories DEBIAN-CVE-2025-38572

  • 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-2025-38572

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 10.0 6.12.0-55.40.1.el10_0
  • rv RHEL 10.0 6.12.0-55.40.1.el10_0
  • perf RHEL 10.0 6.12.0-55.40.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.40.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.40.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.40.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.40.1.el10_0
  • kernel-core RHEL 10.0 6.12.0-55.40.1.el10_0

red hat advisories RHSA-2025:18318

  • kernel-livepatch-SLE16_Update_0 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 5-160000.4.3
  • kernel-livepatch-SLE16-RT_Update_0 Linux Micro 6.2 4-160000.3.4
  • kernel-livepatch-MICRO-6-0_Update_6 Linux Micro 6.1, Linux Micro 6.0 11-3.1
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 14-1.1
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.0 15-1.2
  • kernel-livepatch-MICRO-6-0_Update_5 Linux Micro 6.0 13-1.2
  • kernel-livepatch-MICRO-6-0_Update_7 Linux Micro 6.0 10-1.2
  • kernel-livepatch-MICRO-6-0_Update_8 Linux Micro 6.0 10-1.2

suse advisories SUSE-SU-2026:20149-1SUSE-SU-2026:20169-1SUSE-SU-2026:20164-1SUSE-SU-2026:0284-1SUSE-SU-2026:0283-1SUSE-SU-2026:0274-1

  • 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-abi-stablelists AlmaLinux 10 6.12.0-55.40.1.el10_0

almalinux advisories ALSA-2025:18318

  • kernel Rocky Linux 10 6.12.0-55.40.1.el10_0

rocky linux advisories RLSA-2025:18318

  • kernel Azure Linux 3.0 6.6.104.2-1
  • kernel CBL-Mariner 2.0 5.15.200.1-1

azure linux advisories AZL-66527AZL-73854

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

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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-2025-38572 updated cvss 7.4

kernel: ipv6: reject malicious packets in ipv6_gso_segment()

  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.40.1.el10_0, perf 6.12.0-55.40.1.el10_0, rtla 6.12.0-55.40.1.el10_0, python3-perf 6.12.0-55.40.1.el10_0, kernel-devel-matched 6.12.0-55.40.1.el10_0, kernel-64k-devel-matched 6.12.0-55.40.1.el10_0, +7 more Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.40.1.el10_0, kernel-64k 6.12.0-55.40.1.el10_0, kernel-core 6.12.0-55.40.1.el10_0, kernel-tools 6.12.0-55.40.1.el10_0, kernel-modules 6.12.0-55.40.1.el10_0, kernel-64k-core 6.12.0-55.40.1.el10_0, +27 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.40.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.40.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.40.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.40.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.40.1.el10_0 Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.40.1.el10_0, kernel-rt-64k 6.12.0-55.40.1.el10_0, kernel-rt-core 6.12.0-55.40.1.el10_0, kernel-rt-modules 6.12.0-55.40.1.el10_0, kernel-rt-64k-core 6.12.0-55.40.1.el10_0, kernel-rt-debug-core 6.12.0-55.40.1.el10_0, +14 more Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.40.1.el10_0, kernel-rt-kvm 6.12.0-55.40.1.el10_0, kernel-rt-core 6.12.0-55.40.1.el10_0, kernel-rt-modules 6.12.0-55.40.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.40.1.el10_0, kernel-rt-debug-core 6.12.0-55.40.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:18318
  • 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 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 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

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 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

Classification

Technology feeds

References

Sources

Fencer Intel 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.