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Fencer Vulns
high 8.2

CVE-2025-37749 json

net: ppp: Add bound checking for skb data on ppp_sync_txmung

published 2025-05-01 18 mo ago modified 2026-08-05 3 mo ago also EUVD-2025-13070

cvss
8.2
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 35%
public exploits
0
none known

Summary

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

net: ppp: Add bound checking for skb data on ppp_sync_txmung

Ensure we have enough data in linear buffer from skb before accessing initial bytes. This prevents potential out-of-bounds accesses when processing short packets.

When ppp_sync_txmung receives an incoming package with an empty payload: (remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header) $18 = { type = 0x1, ver = 0x1, code = 0x0, sid = 0x2, length = 0x0, tag = 0xffff8880371cdb96 }

from the skb struct (trimmed) tail = 0x16, end = 0x140, head = 0xffff88803346f400 "4", data = 0xffff88803346f416 ":\377", truesize = 0x380, len = 0x0, data_len = 0x0, mac_len = 0xe, hdr_len = 0x0,

it is not safe to access data[2].

[pabeni@redhat.com: fixed subj typo]

Patch / fix

  • Linux Linux 5.4.293, 5.10.237, 5.15.181, 6.1.135, 6.6.88, 6.12.24, 6.13.12, 6.14.3, 6.15
  • linux Debian 12 6.1.135-1
  • linux Debian 14, Debian 13 6.12.25-1

debian advisories DEBIAN-CVE-2025-37749

  • linux Ubuntu 22.04 LTS 5.15.0-144.157
  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1088.95
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1087.96
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1085.91
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48

ubuntu advisories UBUNTU-CVE-2025-37749

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 6.12.0-124.8.1.el10_1
  • rv RHEL 10.1 6.12.0-124.8.1.el10_1
  • perf RHEL 10.1 6.12.0-124.8.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.8.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.8.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.8.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.8.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.8.1.el10_1

red hat advisories RHSA-2025:20095RHSA-2025:8248RHSA-2025:7903

  • dtb-aarch64 openSUSE Leap 15.6 6.4.0-150600.23.53.1
  • kernel-64kb SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 6.4.0-150600.23.53.1
  • kernel-syms SLE Module for Development Tools 15 SP6, openSUSE Leap 15.6 6.4.0-150600.23.53.1
  • kernel-obs-qa openSUSE Leap 15.6 6.4.0-150600.23.53.1
  • kernel-source SLE Module for Development Tools 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 6.4.0-150600.23.53.1
  • kernel-default SLE Workstation Extension 15 SP6, SLE Module for Legacy 15 SP6, SLE Module for Basesystem 15 SP6 +3 more 6.4.0-150600.23.53.1
  • kernel-kvmsmall openSUSE Leap 15.6 6.4.0-150600.23.53.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 6.4.0-150600.23.53.1

suse advisories SUSE-SU-2025:02000-1SUSE-SU-2025:01983-1SUSE-SU-2025:01972-1SUSE-SU-2025:20413-1SUSE-SU-2025:01967-1SUSE-SU-2025:01965-1

  • kernel AlmaLinux 10 6.12.0-124.8.1.el10_1
  • rv AlmaLinux 10 6.12.0-124.8.1.el10_1
  • perf AlmaLinux 10 6.12.0-124.8.1.el10_1
  • rtla AlmaLinux 10 6.12.0-124.8.1.el10_1
  • libperf AlmaLinux 10 6.12.0-124.8.1.el10_1
  • kernel-rt AlmaLinux 10 6.12.0-124.8.1.el10_1
  • kernel-64k AlmaLinux 10 6.12.0-124.8.1.el10_1
  • kernel-core AlmaLinux 10 6.12.0-124.8.1.el10_1

almalinux advisories ALSA-2025:20095ALSA-2025:7903

  • kernel Rocky Linux 10 6.12.0-124.8.1.el10_1

rocky linux advisories RLSA-2025:20095

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-2025-37749 updated cvss 6.1

kernel: net: ppp: Add bound checking for skb data on ppp_sync_txmung

  • 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 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 planned “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.70.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.70.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.70.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.70.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.70.1.el9_4
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:8248
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.17.1.el9_6, perf 5.14.0-570.17.1.el9_6, rtla 5.14.0-570.17.1.el9_6, python3-perf 5.14.0-570.17.1.el9_6, kernel-devel-matched 5.14.0-570.17.1.el9_6, kernel-64k-devel-matched 5.14.0-570.17.1.el9_6, +7 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7903
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.8.1.el10_1, perf 6.12.0-124.8.1.el10_1, rtla 6.12.0-124.8.1.el10_1, python3-perf 6.12.0-124.8.1.el10_1, kernel-devel-matched 6.12.0-124.8.1.el10_1, kernel-64k-devel-matched 6.12.0-124.8.1.el10_1, +7 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:20095
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.70.1.el9_4, perf 5.14.0-427.70.1.el9_4, rtla 5.14.0-427.70.1.el9_4, kernel-devel-matched 5.14.0-427.70.1.el9_4, kernel-64k-devel-matched 5.14.0-427.70.1.el9_4, kernel-debug-devel-matched 5.14.0-427.70.1.el9_4, +6 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:8248
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.17.1.el9_6, kernel-64k 5.14.0-570.17.1.el9_6, kernel-core 5.14.0-570.17.1.el9_6, kernel-tools 5.14.0-570.17.1.el9_6, kernel-modules 5.14.0-570.17.1.el9_6, kernel-64k-core 5.14.0-570.17.1.el9_6, +27 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7903
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.8.1.el10_1, kernel-64k 6.12.0-124.8.1.el10_1, kernel-core 6.12.0-124.8.1.el10_1, kernel-tools 6.12.0-124.8.1.el10_1, kernel-modules 6.12.0-124.8.1.el10_1, kernel-64k-core 6.12.0-124.8.1.el10_1, +28 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:20095
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.70.1.el9_4, kernel 5.14.0-427.70.1.el9_4, kernel-64k 5.14.0-427.70.1.el9_4, kernel-core 5.14.0-427.70.1.el9_4, kernel-tools 5.14.0-427.70.1.el9_4, python3-perf 5.14.0-427.70.1.el9_4, +28 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:8248
show 8 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.17.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.17.1.el9_6
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7903
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.8.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.8.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.8.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.8.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.8.1.el10_1
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:20095
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.17.1.el9_6, kernel-rt-64k 5.14.0-570.17.1.el9_6, kernel-rt-core 5.14.0-570.17.1.el9_6, kernel-rt-modules 5.14.0-570.17.1.el9_6, kernel-rt-64k-core 5.14.0-570.17.1.el9_6, kernel-rt-debug-core 5.14.0-570.17.1.el9_6, +14 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7903
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.8.1.el10_1, kernel-rt-64k 6.12.0-124.8.1.el10_1, kernel-rt-core 6.12.0-124.8.1.el10_1, kernel-rt-modules 6.12.0-124.8.1.el10_1, kernel-rt-64k-core 6.12.0-124.8.1.el10_1, kernel-rt-debug-core 6.12.0-124.8.1.el10_1, +14 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:20095
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.70.1.el9_4, kernel-rt-core 5.14.0-427.70.1.el9_4, kernel-rt-modules 5.14.0-427.70.1.el9_4, kernel-rt-debug-core 5.14.0-427.70.1.el9_4, kernel-rt-modules-core 5.14.0-427.70.1.el9_4, kernel-rt-debug-modules 5.14.0-427.70.1.el9_4, +4 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:8248
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.17.1.el9_6, kernel-rt-kvm 5.14.0-570.17.1.el9_6, kernel-rt-core 5.14.0-570.17.1.el9_6, kernel-rt-modules 5.14.0-570.17.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.17.1.el9_6, kernel-rt-debug-core 5.14.0-570.17.1.el9_6, +6 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:7903
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.8.1.el10_1, kernel-rt-core 6.12.0-124.8.1.el10_1, kernel-rt-modules 6.12.0-124.8.1.el10_1, kernel-rt-debug-core 6.12.0-124.8.1.el10_1, kernel-rt-modules-core 6.12.0-124.8.1.el10_1, kernel-rt-debug-modules 6.12.0-124.8.1.el10_1, +4 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:20095
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.70.1.el9_4, kernel-rt-kvm 5.14.0-427.70.1.el9_4, kernel-rt-core 5.14.0-427.70.1.el9_4, kernel-rt-modules 5.14.0-427.70.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.70.1.el9_4, kernel-rt-debug-core 5.14.0-427.70.1.el9_4, +6 more
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.” RHSA-2025:8248

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

0.40% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux

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.