{"cve":"CVE-2026-98014","nvd":{"published":"2026-09-25T11:17:29.767","modified":"2026-10-19T10:17:54.773","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: E-Switch, prevent mc_list repopulation during vport disable\n\nIn mlx5_esw_vport_disable(), move esw_apply_vport_rx_mode() ahead\nof esw_vport_change_handle_locked() so vport->allmulti_rule is\nNULL before the change handler observes it.\n\nDuring FW-fatal recovery the disable runs while dev->state ==\nINTERNAL_ERROR. The promisc query inside esw_update_vport_rx_mode()\nfails and returns early, leaving vport->allmulti_rule intact, so\nesw_update_vport_mc_promisc() runs and adds MLX5_ACTION_ADD entries\nto vport->mc_list whose flow rules are then installed in the FDB\nby esw_add_mc_addr(). esw_destroy_legacy_table() tears down the\nFDB with those refs still held, corrupting the sub-tree and\nleaving dangling flow_rule pointers in vport->mc_list.\n\nTwo-stage failure on `echo 1 > /sys/bus/pci/devices/<bdf>/reset`:\n\n  refcount_t: underflow; use-after-free.\n   tree_put_node+0xef/0x110 [mlx5_core]\n   clean_tree+0x44/0xd0 [mlx5_core] (x5)\n   mlx5_fs_core_cleanup+0x57/0x1c0 [mlx5_core]\n   mlx5_unload+0x65/0xd0 [mlx5_core]\n   ... mlx5_health_try_recover\n\n  BUG: unable to handle page fault for address: 0000000003000055\n   down_write+0x1c/0x60\n   mlx5_del_flow_rules+0x33/0x1f0 [mlx5_core]\n   esw_del_mc_addr+0x7b/0x170 [mlx5_core]\n   esw_apply_vport_addr_list+0x56/0xf0 [mlx5_core]\n   esw_vport_change_handle_locked+0x28b/0x310 [mlx5_core]\n   mlx5_esw_vport_enable+0x270/0x4a0 [mlx5_core]\n   ... mlx5_load ... mlx5_health_try_recover\n\nesw_apply_vport_rx_mode(false, false) clears vport->allmulti_rule\nvia its local state machine even when the FW del fails. With the\nrule NULL the !IS_ERR_OR_NULL(allmulti_rule) gate in the change\nhandler closes, no rules are installed during disable, and the\nreload starts with a clean mc_list.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/2196f9d3358b00fcb28835a5fde14071f51ecb96","https://git.kernel.org/stable/c/413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9","https://git.kernel.org/stable/c/5a2b87dfceccf9065157a14a599d395c2b6281b8","https://git.kernel.org/stable/c/668e050429c7ca688cf4e7112f97f0cd269d446b","https://git.kernel.org/stable/c/69904608e25e8ba58111aadd9210892cf3876201"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-98014","score":0.00173,"percentile":0.06641,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}