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CVE-2026-98304

Linux: net: bcmgenet: restore the hardware filters on open

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in56db7ec462d6a2b886e299ad835109c089606969Also 906140955c8debde65afe12e594e04c49a61b0d9, 23ca4ddc4fce2c233a49e9fd34d4b5b02bd7324eCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 56db7ec462d6a2b886e299ad835109c089606969LinuxCVE List
  • 906140955c8debde65afe12e594e04c49a61b0d9LinuxCVE List
  • 23ca4ddc4fce2c233a49e9fd34d4b5b02bd7324eLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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

net: bcmgenet: restore the hardware filters on open

bcmgenet_hfb_init() runs INIT_LIST_HEAD() on priv->rxnfc_list, which drops every rule off the list, and bcmgenet_open() calls it on each ifup. Every rule the user configured is silently lost:

ethtool -N eth0 flow-type ether dst $MAC action 0

Added rule with ID 0

ethtool -n eth0 | grep -c Filter:

1

ip link set eth0 down && ip link set eth0 up

ethtool -n eth0 | grep -c Filter:

0

Initialise the lists once at probe and restore the rules on open, as bcmgenet_resume() already does.

Text from CVE List

Affected versions 8

  • Linuxaffected: 3e370952287c55e5fd240cb8bb41ef8acff8829d before 56db7ec462d6a2b886e299ad835109c089606969CVE List
  • Linuxaffected: 3e370952287c55e5fd240cb8bb41ef8acff8829d before 906140955c8debde65afe12e594e04c49a61b0d9CVE List
  • Linuxaffected: 3e370952287c55e5fd240cb8bb41ef8acff8829d before 23ca4ddc4fce2c233a49e9fd34d4b5b02bd7324eCVE List
  • Linuxaffected: 5.8CVE List
  • Linuxunaffected: all versions before 5.8CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 3