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CVE-2026-98014— net/mlx5: E-Switch, prevent mc_list repopulation during vport disable

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： net/mlx5: E-Switch，在 vport 禁用期间防止 mc_list 重新填充 在 函数中，将 移至 之前，以便在变更处理器观察到 之前，将其设置为 NULL。 在固件致命错误恢复期间，当 时，禁用操作仍在运行。 中的混杂模式查询失败并提前返回，导致 保持不变。因此， 会继续运行，并向 添加 条目，这些流规则随后由 安装到 FDB（转发数据库）中。然而， 在销毁 FDB 时，这些引用仍未释放，导致子树损坏，并在 中留下悬空的 指针。 在 上出现的两阶段故障

AI Predicted 6.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 4df1f2d36bdc9a368650bf14b9097c555e95f71d< 413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9 affected
63546395a0e6ac264f78f65218086ce6014b4494< 2196f9d3358b00fcb28835a5fde14071f51ecb96 affected
922f56e9a795d6f3dd72d3428ebdd7ee040fa855< 5a2b87dfceccf9065157a14a599d395c2b6281b8 affected
922f56e9a795d6f3dd72d3428ebdd7ee040fa855< 69904608e25e8ba58111aadd9210892cf3876201 affected
922f56e9a795d6f3dd72d3428ebdd7ee040fa855< 72cfcb79026cffb6490f5044153a841d360b0cfc affected
922f56e9a795d6f3dd72d3428ebdd7ee040fa855< 668e050429c7ca688cf4e7112f97f0cd269d446b affected
922f56e9a795d6f3dd72d3428ebdd7ee040fa855< c0c6f4ba8a37688f7b4d4044898d88f0450d44c2 affected
18cead61e437f4c7898acca0a5f3df12f801d97f affected
… +14 more rows
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I. Basic Information for CVE-2026-98014

Vulnerability Information
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Vulnerability Title
net/mlx5: E-Switch, prevent mc_list repopulation during vport disable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4df1f2d36bdc9a368650bf14b9097c555e95f71d ~ 413e04adcc1fd263cf02b1b83b4a0dbdc66bcee9 -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-98014

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III. Intelligence Information for CVE-2026-98014

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Patches & Fixes for CVE-2026-98014 (7)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98014

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