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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98798
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:33 UTC
Updated2026-10-19 10:19:43 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9f4ca05827a27ec73bf63a42732f1978b8a779af 0d867b91598b6ed2f75998c34f4e2869631da31e git Not specified
CNA Linux Linux affected 9f4ca05827a27ec73bf63a42732f1978b8a779af 2294b62eaec6fd3c76a261d287f66641eeafd5f0 git Not specified
CNA Linux Linux affected 9f4ca05827a27ec73bf63a42732f1978b8a779af d870102b5425390cab42eebbf3d19ec6a43c6734 git Not specified
CNA Linux Linux affected 9f4ca05827a27ec73bf63a42732f1978b8a779af 19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1 git Not specified
CNA Linux Linux affected 4.17 Not specified
CNA Linux Linux unaffected 4.17 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2294b62eaec6fd3c76a261d287f66641eeafd5f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d867b91598b6ed2f75998c34f4e2869631da31e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d870102b5425390cab42eebbf3d19ec6a43c6734 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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