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Fencer Intel
high 7.9

CVE-2019-9503 json

Broadcom brcmfmac driver is vulnerable to a frame validation bypass

published 2020-01-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18877

cvss
7.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and unprocessed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a wifi dongle). This can allow firmware event frames from a remote source to be processed. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.19.37-4

debian advisories DEBIAN-CVE-2019-9503

  • linux Ubuntu 16.04 LTS 4.4.0-157.185
  • linux Ubuntu 18.04 LTS 4.15.0-50.54
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1090.101
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1039.41
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1032.34~16.04.1
  • linux-gcp Ubuntu 18.04 LTS 4.15.0-1032.34
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-50.54~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 4.18.0-20.21~18.04.1

ubuntu advisories UBUNTU-CVE-2019-9503

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 8 4.18.0-80.11.1.el8_0
  • perf RHEL 8 4.18.0-80.11.1.el8_0
  • bpftool RHEL 8 4.18.0-80.11.1.el8_0
  • kernel-core RHEL 8 4.18.0-80.11.1.el8_0
  • kernel-tools RHEL 8 4.18.0-80.11.1.el8_0
  • python3-perf RHEL 8 4.18.0-80.11.1.el8_0
  • kernel-modules RHEL 8 4.18.0-80.11.1.el8_0
  • kernel-zfcpdump RHEL 8 4.18.0-80.11.1.el8_0

red hat advisories RHSA-2019:2703RHSA-2020:1016RHSA-2020:2522RHSA-2020:1070RHSA-2019:2741

  • kernel-source-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.8.1
  • kernel-syms SLE Module for Development Tools 15 SP1 4.12.14-197.4.1
  • kernel-source SLE Module for Development Tools 15 SP1, SLE Module for Basesystem 15 SP1 4.12.14-197.4.1
  • kernel-default SLE Workstation Extension 15 SP1, SLE Module for Legacy 15 SP1, SLE Module for Basesystem 15 SP1 +2 more 4.12.14-197.4.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP1 4.12.14-197.4.1

suse advisories SUSE-SU-2019:2430-1SUSE-SU-2019:1550-1SUSE-SU-2019:1289-1SUSE-SU-2019:1287-1SUSE-SU-2019:1245-1SUSE-SU-2019:1244-1

  • kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.4.1
  • kernel-syms openSUSE Leap 15.0 4.12.14-lp150.12.61.1

opensuse advisories openSUSE-SU-2019:1479-1openSUSE-SU-2019:1404-1

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-2019-9503 updated cvss 5.9

kernel: brcmfmac frame validation bypass

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-80.11.1.el8_0, kernel-debuginfo-common-aarch64 4.18.0-80.11.1.el8_0, kernel-debuginfo-common-ppc64le 4.18.0-80.11.1.el8_0 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-80.11.1.el8_0, kernel 4.18.0-80.11.1.el8_0, bpftool 4.18.0-80.11.1.el8_0, kernel-core 4.18.0-80.11.1.el8_0, kernel-tools 4.18.0-80.11.1.el8_0, python3-perf 4.18.0-80.11.1.el8_0, +15 more
    fixed: vendor fix RHSA-2019:2703
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, kernel-tools-libs 3.10.0-1127.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1127.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, kernel-tools-libs 3.10.0-1127.el7, +2 more
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) perf 3.10.0-1062.26.1.el7, kernel 3.10.0-1062.26.1.el7, bpftool 3.10.0-1062.26.1.el7, python-perf 3.10.0-1062.26.1.el7, kernel-tools 3.10.0-1062.26.1.el7, kernel-tools-libs 3.10.0-1062.26.1.el7, +2 more
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1127.el7
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.26.1.el7
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1127.rt56.1093.el7, kernel-rt-trace 3.10.0-1127.rt56.1093.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1127.rt56.1093.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1127.rt56.1093.el7, kernel-rt-kvm 3.10.0-1127.rt56.1093.el7, kernel-rt-trace 3.10.0-1127.rt56.1093.el7, kernel-rt-debug-kvm 3.10.0-1127.rt56.1093.el7, kernel-rt-trace-kvm 3.10.0-1127.rt56.1093.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1127.rt56.1093.el7
    fixed: vendor fix RHSA-2020:1070
show 7 more
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-core 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-modules 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-debug-core 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-debug-modules 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-modules-extra 4.18.0-80.11.1.rt9.156.el8_0, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-kvm 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-core 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-modules 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-debug-kvm 4.18.0-80.11.1.rt9.156.el8_0, kernel-rt-debug-core 4.18.0-80.11.1.rt9.156.el8_0, +4 more
    fixed: vendor fix RHSA-2019:2741
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-kdump 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, +7 more
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux Server EUS (v. 7.7) perf 3.10.0-1062.26.1.el7, kernel 3.10.0-1062.26.1.el7, bpftool 3.10.0-1062.26.1.el7, python-perf 3.10.0-1062.26.1.el7, kernel-kdump 3.10.0-1062.26.1.el7, kernel-tools 3.10.0-1062.26.1.el7, +7 more
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1127.el7, kernel-debuginfo-common-x86_64 3.10.0-1127.el7, kernel-debuginfo-common-ppc64le 3.10.0-1127.el7
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) kernel-debuginfo-common-ppc64 3.10.0-1062.26.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1062.26.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.26.1.el7
    fixed: vendor fix RHSA-2020:2522
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1127.el7, kernel 3.10.0-1127.el7, bpftool 3.10.0-1127.el7, python-perf 3.10.0-1127.el7, kernel-tools 3.10.0-1127.el7, kernel-tools-libs 3.10.0-1127.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1127.el7
    fixed: vendor fix RHSA-2020:1016
  • Red Hat Enterprise Linux 5 kernel
    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

3.29% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.9 CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD 3.1 8.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 7.9 AV:A/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Broadcom brcmfmac WiFi driver

Classification

Weakness
  • CWE-20 Improper Input Validation

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.