{"id":"CVE-2026-98798","state":"PUBLISHED","title":"net: bcmgenet: fix NULL dereference in set_coalesce before first open","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: fix NULL dereference in set_coalesce before first open\n\nThe Rx ring priv and index are only set in bcmgenet_init_rx_ring(),\nwhich runs at open. Setting the Rx coalescing parameters on an interface\nthat was never opened, e.g. \"ethtool -C eth0 rx-usecs 50\", dereferences\na NULL ring->priv. The oops happens with RTNL held, so networking\nstays stuck until a reboot:\n\n  Unable to handle kernel paging request at virtual address 0000000000002788\n  pc : bcmgenet_set_rx_coalesce.isra.0+0x10/0x88\n  lr : bcmgenet_set_coalesce+0xe8/0x180\n  Call trace:\n   bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 (P)\n   __ethnl_set_coalesce.isra.0+0x490/0x570\n   ethnl_set_coalesce+0x48/0xc0\n   ethnl_default_set_doit+0xf4/0x230\n   genl_family_rcv_msg_doit+0xe8/0x160\n   genl_rcv_msg+0x220/0x2a0\n   netlink_rcv_skb+0x68/0x140\n   genl_rcv+0x40/0x60\n   netlink_unicast+0x338/0x3c0\n   netlink_sendmsg+0x19c/0x3f8\n   __sock_sendmsg+0x64/0xc0\n   __sys_sendto+0x124/0x198\n   __arm64_sys_sendto+0x30/0x48\n\nSet priv and index at probe. Writing the registers while the interface\nis down is harmless because open resets the MAC and\nbcmgenet_init_rx_coalesce() reapplies the stored values.\n\nIt was observed on a Raspberry Pi CM4, but should apply to all other\ngenet devices.","publishedAt":"2026-10-18T15:48:43.367Z","updatedAt":"2026-10-30T12:39:53.751Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"51e76b4113e5147329ed8dd232375bf11fd34044","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"213ff02ab26a4543ef02b4db393bbdd5fa5679a7","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"0d867b91598b6ed2f75998c34f4e2869631da31e","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"2294b62eaec6fd3c76a261d287f66641eeafd5f0","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"d870102b5425390cab42eebbf3d19ec6a43c6734","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/genet/bcmgenet.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/genet/bcmgenet.c"]}],"references":["https://git.kernel.org/stable/c/51e76b4113e5147329ed8dd232375bf11fd34044","https://git.kernel.org/stable/c/213ff02ab26a4543ef02b4db393bbdd5fa5679a7","https://git.kernel.org/stable/c/0d867b91598b6ed2f75998c34f4e2869631da31e","https://git.kernel.org/stable/c/2294b62eaec6fd3c76a261d287f66641eeafd5f0","https://git.kernel.org/stable/c/d870102b5425390cab42eebbf3d19ec6a43c6734","https://git.kernel.org/stable/c/19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98798.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98798","state":"PUBLISHED","datePublished":"2026-10-18T15:48:43.367Z","dateUpdated":"2026-10-30T12:39:53.751Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.370Z"},"containers":{"cna":{"title":"net: bcmgenet: fix NULL dereference in set_coalesce before first open","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: fix NULL dereference in set_coalesce before first open\n\nThe Rx ring priv and index are only set in bcmgenet_init_rx_ring(),\nwhich runs at open. Setting the Rx coalescing parameters on an interface\nthat was never opened, e.g. \"ethtool -C eth0 rx-usecs 50\", dereferences\na NULL ring->priv. The oops happens with RTNL held, so networking\nstays stuck until a reboot:\n\n  Unable to handle kernel paging request at virtual address 0000000000002788\n  pc : bcmgenet_set_rx_coalesce.isra.0+0x10/0x88\n  lr : bcmgenet_set_coalesce+0xe8/0x180\n  Call trace:\n   bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 (P)\n   __ethnl_set_coalesce.isra.0+0x490/0x570\n   ethnl_set_coalesce+0x48/0xc0\n   ethnl_default_set_doit+0xf4/0x230\n   genl_family_rcv_msg_doit+0xe8/0x160\n   genl_rcv_msg+0x220/0x2a0\n   netlink_rcv_skb+0x68/0x140\n   genl_rcv+0x40/0x60\n   netlink_unicast+0x338/0x3c0\n   netlink_sendmsg+0x19c/0x3f8\n   __sock_sendmsg+0x64/0xc0\n   __sys_sendto+0x124/0x198\n   __arm64_sys_sendto+0x30/0x48\n\nSet priv and index at probe. Writing the registers while the interface\nis down is harmless because open resets the MAC and\nbcmgenet_init_rx_coalesce() reapplies the stored values.\n\nIt was observed on a Raspberry Pi CM4, but should apply to all other\ngenet devices."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"51e76b4113e5147329ed8dd232375bf11fd34044","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"213ff02ab26a4543ef02b4db393bbdd5fa5679a7","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"0d867b91598b6ed2f75998c34f4e2869631da31e","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"2294b62eaec6fd3c76a261d287f66641eeafd5f0","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"d870102b5425390cab42eebbf3d19ec6a43c6734","versionType":"git"},{"version":"9f4ca05827a27ec73bf63a42732f1978b8a779af","status":"affected","lessThan":"19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/genet/bcmgenet.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/genet/bcmgenet.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/51e76b4113e5147329ed8dd232375bf11fd34044"},{"url":"https://git.kernel.org/stable/c/213ff02ab26a4543ef02b4db393bbdd5fa5679a7"},{"url":"https://git.kernel.org/stable/c/0d867b91598b6ed2f75998c34f4e2869631da31e"},{"url":"https://git.kernel.org/stable/c/2294b62eaec6fd3c76a261d287f66641eeafd5f0"},{"url":"https://git.kernel.org/stable/c/d870102b5425390cab42eebbf3d19ec6a43c6734"},{"url":"https://git.kernel.org/stable/c/19419faf58dfe5bcc8a9e60e622976c5f8e3ddc1"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:53.751Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}