net/mlx5: E-Switch, prevent mc_list repopulation during vport disable
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 6 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.15.105 to before 5.15.222; 6.1.22 to before 6.1.189; 5.10.177 to before 5.11; 6.2.9 to before 6.3 | 5.15.222, 6.1.189, 5.11, 6.3 | Patch available | CNA |
| Linux | Linux | 6.3 and later | 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 5.15.105 to before 5.15.222; 6.1.22 to before 6.1.189; 5.10.177 to before 5.11; 6.2.9 to before 6.3 Fixed in 5.15.222, 6.1.189, 5.11, 6.3 Patch available CNA
- Linux VendorLinux Affected 6.3 and later Fixed in 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.222, 6.1.189, 5.11, 6.3
- Fix · CNA Linux (Linux) Fixed in 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 3 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-98014
- 2026-10-03 Alias added: GHSA-hjxx-jpr5-hfgw
- 2026-10-03 Fix available: Linux/Linux@2196f9d3358b00fcb28835a5fde14071f51ecb96, Linux/Linux@413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9, Linux/[email protected] +3 · CNA
- 2026-10-03 3 new references · CNA
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-23 CVSS score changed · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
References
Other 7
- 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
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Sources
- CVE-2026-98014 · CVE Program
- CVE-2026-98014 · NVD
- FIRST EPSS
- GHSA-hjxx-jpr5-hfgw · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98014 · Red Hat security data · CC BY 4.0
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