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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98798

net: bcmgenet: fix NULL dereference in set_coalesce before first open

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net: bcmgenet: fix NULL dereference in set_coalesce before first open The Rx ring priv and index are only set in bcmgenet_init_rx_ring(), which runs at open. Setting the Rx coalescing parameters on an interface that was never opened, e.g. "ethtool -C eth0 rx-usecs 50", dereferences a NULL ring->priv. The oops happens with RTNL held, so networking stays stuck until a reboot: Unable to handle kernel paging request at virtual address 0000000000002788 pc : bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 lr : bcmgenet_set_coalesce+0xe8/0x180 Call trace: bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 (P) __ethnl_set_coalesce.isra.0+0x490/0x570 ethnl_set_coalesce+0x48/0xc0 ethnl_default_set_doit+0xf4/0x230 genl_family_rcv_msg_doit+0xe8/0x160 genl_rcv_msg+0x220/0x2a0 netlink_rcv_skb+0x68/0x140 genl_rcv+0x40/0x60 netlink_unicast+0x338/0x3c0 netlink_sendmsg+0x19c/0x3f8 __sock_sendmsg+0x64/0xc0 __sys_sendto+0x124/0x198 __arm64_sys_sendto+0x30/0x48 Set priv and index at probe. Writing the registers while the interface is down is harmless because open resets the MAC and bcmgenet_init_rx_coalesce() reapplies the stored values. It was observed on a Raspberry Pi CM4, but should apply to all other genet devices.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 9f4ca05827a27ec73bf63a42732f1978b8a779af to < 51e76b4113e5147329ed8dd232375bf11fd34044affected
  • 9f4ca05827a27ec73bf63a42732f1978b8a779af to < 213ff02ab26a4543ef02b4db393bbdd5fa5679a7affected
  • 9f4ca05827a27ec73bf63a42732f1978b8a779af to < 0d867b91598b6ed2f75998c34f4e2869631da31eaffected
  • 9f4ca05827a27ec73bf63a42732f1978b8a779af to < 2294b62eaec6fd3c76a261d287f66641eeafd5f0affected
  • 9f4ca05827a27ec73bf63a42732f1978b8a779af to < d870102b5425390cab42eebbf3d19ec6a43c6734affected
  • 9f4ca05827a27ec73bf63a42732f1978b8a779af to < 19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1affected

Linux Linux

Default version status: affected

  • 4.17affected
  • 0 to < 4.17unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.113 to ≤ 6.12.*unaffected
  • 6.18.56 to ≤ 6.18.*unaffected
  • 7.2.10 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References