{"id":"CVE-2026-98014","state":"PUBLISHED","title":"net/mlx5: E-Switch, prevent mc_list repopulation during vport disable","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.","publishedAt":"2026-09-25T10:23:37.131Z","updatedAt":"2026-10-19T09:12:19.664Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4df1f2d36bdc9a368650bf14b9097c555e95f71d","status":"affected","lessThan":"413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9","versionType":"git"},{"version":"63546395a0e6ac264f78f65218086ce6014b4494","status":"affected","lessThan":"2196f9d3358b00fcb28835a5fde14071f51ecb96","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"5a2b87dfceccf9065157a14a599d395c2b6281b8","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"69904608e25e8ba58111aadd9210892cf3876201","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"72cfcb79026cffb6490f5044153a841d360b0cfc","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"668e050429c7ca688cf4e7112f97f0cd269d446b","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"c0c6f4ba8a37688f7b4d4044898d88f0450d44c2","versionType":"git"},{"version":"18cead61e437f4c7898acca0a5f3df12f801d97f","status":"affected","versionType":"git"},{"version":"6f5780536181d1d0d09a11a1bc92f22e143447e2","status":"affected","versionType":"git"},{"version":"5.15.105","status":"affected","lessThan":"5.15.222","versionType":"semver"},{"version":"6.1.22","status":"affected","lessThan":"6.1.189","versionType":"semver"},{"version":"5.10.177","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"6.2.9","status":"affected","lessThan":"6.3","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/eswitch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","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/mellanox/mlx5/core/eswitch.c"]}],"references":["https://git.kernel.org/stable/c/413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9","https://git.kernel.org/stable/c/2196f9d3358b00fcb28835a5fde14071f51ecb96","https://git.kernel.org/stable/c/5a2b87dfceccf9065157a14a599d395c2b6281b8","https://git.kernel.org/stable/c/69904608e25e8ba58111aadd9210892cf3876201","https://git.kernel.org/stable/c/72cfcb79026cffb6490f5044153a841d360b0cfc","https://git.kernel.org/stable/c/668e050429c7ca688cf4e7112f97f0cd269d446b","https://git.kernel.org/stable/c/c0c6f4ba8a37688f7b4d4044898d88f0450d44c2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98014.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98014","state":"PUBLISHED","datePublished":"2026-09-25T10:23:37.131Z","dateUpdated":"2026-10-19T09:12:19.664Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.069Z"},"containers":{"cna":{"title":"net/mlx5: E-Switch, prevent mc_list repopulation during vport disable","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4df1f2d36bdc9a368650bf14b9097c555e95f71d","status":"affected","lessThan":"413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9","versionType":"git"},{"version":"63546395a0e6ac264f78f65218086ce6014b4494","status":"affected","lessThan":"2196f9d3358b00fcb28835a5fde14071f51ecb96","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"5a2b87dfceccf9065157a14a599d395c2b6281b8","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"69904608e25e8ba58111aadd9210892cf3876201","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"72cfcb79026cffb6490f5044153a841d360b0cfc","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"668e050429c7ca688cf4e7112f97f0cd269d446b","versionType":"git"},{"version":"922f56e9a795d6f3dd72d3428ebdd7ee040fa855","status":"affected","lessThan":"c0c6f4ba8a37688f7b4d4044898d88f0450d44c2","versionType":"git"},{"version":"18cead61e437f4c7898acca0a5f3df12f801d97f","status":"affected","versionType":"git"},{"version":"6f5780536181d1d0d09a11a1bc92f22e143447e2","status":"affected","versionType":"git"},{"version":"5.15.105","status":"affected","lessThan":"5.15.222","versionType":"semver"},{"version":"6.1.22","status":"affected","lessThan":"6.1.189","versionType":"semver"},{"version":"5.10.177","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"6.2.9","status":"affected","lessThan":"6.3","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/eswitch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","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/mellanox/mlx5/core/eswitch.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9"},{"url":"https://git.kernel.org/stable/c/2196f9d3358b00fcb28835a5fde14071f51ecb96"},{"url":"https://git.kernel.org/stable/c/5a2b87dfceccf9065157a14a599d395c2b6281b8"},{"url":"https://git.kernel.org/stable/c/69904608e25e8ba58111aadd9210892cf3876201"},{"url":"https://git.kernel.org/stable/c/72cfcb79026cffb6490f5044153a841d360b0cfc"},{"url":"https://git.kernel.org/stable/c/668e050429c7ca688cf4e7112f97f0cd269d446b"},{"url":"https://git.kernel.org/stable/c/c0c6f4ba8a37688f7b4d4044898d88f0450d44c2"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:12:19.664Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.105","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.22","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}