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Fencer Vulns
medium 5.5

CVE-2025-38441 json

netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

published 2025-07-25 15 mo ago modified 2026-11-05 3 d ago also EUVD-2025-22700

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

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

netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

syzbot found a potential access to uninit-value in nf_flow_pppoe_proto()

Blamed commit forgot the Ethernet header.

BUG: KMSAN: uninit-value in nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27 nf_flow_offload_inet_hook+0x7e4/0x940 net/netfilter/nf_flow_table_inet.c:27 nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline] nf_hook_slow+0xe1/0x3d0 net/netfilter/core.c:623 nf_hook_ingress include/linux/netfilter_netdev.h:34 [inline] nf_ingress net/core/dev.c:5742 [inline] __netif_receive_skb_core+0x4aff/0x70c0 net/core/dev.c:5837 __netif_receive_skb_one_core net/core/dev.c:5975 [inline] __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6090 netif_receive_skb_internal net/core/dev.c:6176 [inline] netif_receive_skb+0x57/0x630 net/core/dev.c:6235 tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485 tun_get_user+0x4ee0/0x6b40 drivers/net/tun.c:1938 tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1984 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xb4b/0x1580 fs/read_write.c:686 ksys_write fs/read_write.c:738 [inline] __do_sys_write fs/read_write.c:749 [inline]

Patch / fix

  • Linux Linux 5.15.189, 6.1.146, 6.6.99, 6.9, 6.12.39, 6.15.7, 6.16
  • linux Debian 12 6.1.147-1
  • linux Debian 13 6.12.41-1
  • linux Debian 14 6.16.3-1

debian advisories DEBIAN-CVE-2025-38441

  • linux Ubuntu 22.04 LTS 5.15.0-156.166
  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1092.99
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1092.101
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1089.95
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48

ubuntu advisories UBUNTU-CVE-2025-38441

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 9 5.14.0-687.5.1.el9_8
  • rv RHEL 9 5.14.0-687.5.1.el9_8
  • perf RHEL 9 5.14.0-687.5.1.el9_8
  • rtla RHEL 9 5.14.0-687.5.1.el9_8
  • libperf RHEL 9 5.14.0-687.5.1.el9_8
  • kernel-rt RHEL 9 5.14.0-687.5.1.el9_8
  • kernel-64k RHEL 9 5.14.0-687.5.1.el9_8
  • kernel-core RHEL 9 5.14.0-687.5.1.el9_8

red hat advisories RHSA-2026:18587RHSA-2026:18134

  • 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-2025:03634-1SUSE-SU-2025:03633-1

  • 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 10 6.12.0-211.7.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.7.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.7.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.7.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.7.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.7.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.7.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.7.1.el10_2

almalinux advisories ALSA-2026:18134ALSA-2026:18587

  • kernel CBL-Mariner 2.0 5.15.200.1-1

azure linux advisories AZL-72920

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-2025-38441 updated cvss 5.5

kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

  • 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: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.5.1.el9_8, perf 5.14.0-687.5.1.el9_8, rtla 5.14.0-687.5.1.el9_8, python3-perf 5.14.0-687.5.1.el9_8, kernel-devel-matched 5.14.0-687.5.1.el9_8, kernel-64k-devel-matched 5.14.0-687.5.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.7.1.el10_2, perf 6.12.0-211.7.1.el10_2, rtla 6.12.0-211.7.1.el10_2, python3-perf 6.12.0-211.7.1.el10_2, kernel-devel-matched 6.12.0-211.7.1.el10_2, kernel-64k-devel-matched 6.12.0-211.7.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.5.1.el9_8, kernel-64k 5.14.0-687.5.1.el9_8, kernel-core 5.14.0-687.5.1.el9_8, kernel-tools 5.14.0-687.5.1.el9_8, kernel-modules 5.14.0-687.5.1.el9_8, kernel-64k-core 5.14.0-687.5.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.7.1.el10_2, kernel-64k 6.12.0-211.7.1.el10_2, kernel-core 6.12.0-211.7.1.el10_2, kernel-tools 6.12.0-211.7.1.el10_2, kernel-modules 6.12.0-211.7.1.el10_2, kernel-64k-core 6.12.0-211.7.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.5.1.el9_8
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.7.1.el10_2
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.5.1.el9_8, kernel-rt-64k 5.14.0-687.5.1.el9_8, kernel-rt-core 5.14.0-687.5.1.el9_8, kernel-rt-modules 5.14.0-687.5.1.el9_8, kernel-rt-64k-core 5.14.0-687.5.1.el9_8, kernel-rt-debug-core 5.14.0-687.5.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:18587
show 4 more
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.7.1.el10_2, kernel-rt-64k 6.12.0-211.7.1.el10_2, kernel-rt-core 6.12.0-211.7.1.el10_2, kernel-rt-modules 6.12.0-211.7.1.el10_2, kernel-rt-64k-core 6.12.0-211.7.1.el10_2, kernel-rt-debug-core 6.12.0-211.7.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:18134
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.5.1.el9_8, kernel-rt-core 5.14.0-687.5.1.el9_8, kernel-rt-modules 5.14.0-687.5.1.el9_8, kernel-rt-debug-core 5.14.0-687.5.1.el9_8, kernel-rt-modules-core 5.14.0-687.5.1.el9_8, kernel-rt-debug-modules 5.14.0-687.5.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:18587
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.7.1.el10_2, kernel-rt-core 6.12.0-211.7.1.el10_2, kernel-rt-modules 6.12.0-211.7.1.el10_2, kernel-rt-debug-core 6.12.0-211.7.1.el10_2, kernel-rt-modules-core 6.12.0-211.7.1.el10_2, kernel-rt-debug-modules 6.12.0-211.7.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:18134
  • 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
    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
3 d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-908 Use of Uninitialized Resource
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.