net/mlx5: E-Switch, prevent mc_list repopulation during vport disable

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: E-Switch, prevent mc_list repopulation during vport disable In mlx5_esw_vport_disable(), move esw_apply_vport_rx_mode() ahead of esw_vport_change_handle_locked() so vport->allmulti_rule is NULL before the change handler observes it. During FW-fatal recovery the disable runs while dev->state == INTERNAL_ERROR. The promisc query inside esw_update_vport_rx_mode() fails and returns early, leaving vport->allmulti_rule intact, so esw_update_vport_mc_promisc() runs and adds MLX5_ACTION_ADD entries to vport->mc_list whose flow rules are then installed in the FDB by esw_add_mc_addr(). esw_destroy_legacy_table() tears down the FDB with those refs still held, corrupting the sub-tree and leaving dangling flow_rule pointers in vport->mc_list. Two-stage failure on `echo 1 > /sys/bus/pci/devices/<bdf>/reset`: refcount_t: underflow; use-after-free. tree_put_node+0xef/0x110 [mlx5_core] clean_tree+0x44/0xd0 [mlx5_core] (x5) mlx5_fs_core_cleanup+0x57/0x1c0 [mlx5_core] mlx5_unload+0x65/0xd0 [mlx5_core] ... mlx5_health_try_recover BUG: unable to handle page fault for address: 0000000003000055 down_write+0x1c/0x60 mlx5_del_flow_rules+0x33/0x1f0 [mlx5_core] esw_del_mc_addr+0x7b/0x170 [mlx5_core] esw_apply_vport_addr_list+0x56/0xf0 [mlx5_core] esw_vport_change_handle_locked+0x28b/0x310 [mlx5_core] mlx5_esw_vport_enable+0x270/0x4a0 [mlx5_core] ... mlx5_load ... mlx5_health_try_recover esw_apply_vport_rx_mode(false, false) clears vport->allmulti_rule via its local state machine even when the FW del fails. With the rule NULL the !IS_ERR_OR_NULL(allmulti_rule) gate in the change handler closes, no rules are installed during disable, and the reload starts with a clean mc_list.

Timeline

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)

0.17% · top 93% of all CVEs (11 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

• Linux · Linux

  • affected 4df1f2d36bdc9a368650bf14b9097c555e95f71d – < 413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9
  • affected 63546395a0e6ac264f78f65218086ce6014b4494 – < 2196f9d3358b00fcb28835a5fde14071f51ecb96
  • affected 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 – < 5a2b87dfceccf9065157a14a599d395c2b6281b8
  • affected 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 – < 69904608e25e8ba58111aadd9210892cf3876201
  • affected 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 – < 72cfcb79026cffb6490f5044153a841d360b0cfc
  • affected 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 – < 668e050429c7ca688cf4e7112f97f0cd269d446b
  • affected 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 – < c0c6f4ba8a37688f7b4d4044898d88f0450d44c2
  • affected 18cead61e437f4c7898acca0a5f3df12f801d97f
  • affected 6f5780536181d1d0d09a11a1bc92f22e143447e2
  • affected 5.15.105 – < 5.15.222
  • affected 6.1.22 – < 6.1.189
  • affected 5.10.177 – < 5.11
  • affected 6.2.9 – < 6.3

• Linux · Linux

  • affected 6.3
  • unaffected < 6.3
  • unaffected 5.15.222 – ≤ 5.15.*
  • unaffected 6.1.189 – ≤ 6.1.*
  • unaffected 6.6.158 – ≤ 6.6.*
  • unaffected 6.12.111 – ≤ 6.12.*
  • unaffected 6.18.53 – ≤ 6.18.*
  • unaffected 7.2.7 – ≤ 7.2.*
  • unaffected 7.3 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-86667 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-98014](https://cveledger.app/badge/CVE-2026-98014.svg)](https://cveledger.app/cve/CVE-2026-98014)

Record last updated 19 Oct 2026, 09:12 UTC.