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CVE-2026-98796net: ethernet: mtk_eth_soc: allocate dummy netdev sooner

Description

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: mtk_eth_soc: allocate dummy netdev sooner The RX rings and the shared NAPI are carried by an internal "dummy" netdev (eth->dummy_dev). mtk_probe() creates that dummy device, and adds the shared tx/rx NAPI to it, only after the MAC netdevs have been registered. That order has been there since the MT7623 support was added and leaves a window in which the netdevs are visible to the network core before the shared NAPI and the dummy device exist. If anything brings the first netdev up during that window (e.g. netifd opening the WAN link the instant the interface is registered), the first-open path runs without them. On NETSYS v2 and later SoCs mtk_rx_alloc() -> __xdp_rxq_info_reg() then dereferences eth->dummy_dev == NULL: WARNING: CPU: ... Missing net_device from driver in net/core/xdp.c and mtk_open() fails with -ENODEV. On NETSYS v1 SoCs (MT7621/MT7622/MT7623/MT7629) there is no page pool, so the same open instead calls napi_enable() on a napi_struct that netif_napi_add() has not initialised yet and dereferences a NULL napi->dev. Allocate the dummy netdev and add the shared tx/rx NAPI to it before the register_netdev() loop. Both the dummy-allocation failure and a register_netdev() failure now unwind through mtk_unreg_dev(), which unregisters the net_device notifiers and the netdevs registered so far, stopping a concurrently-opened netdev (ndo_stop) and its NAPI before the dummy carrier is freed. A netdev that opened during the window can also have queued the frame-engine reset worker (via the tx watchdog or phylink), so the probe error path now cancels eth->pending_work before freeing the shared state, as mtk_cleanup() already does on remove.

Timeline

  1. ID reserved

    By Linux

  2. · 23 days later

    Published

  3. · 3 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

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 94% of all CVEs (14 Nov 2026)
Loading the EPSS history…

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

Affected products

  • Linux · Linux

    • affected 656e705243fd0c2864b89634ea16ed444ef64dc6 – < efc91ab1d97bd991faf50baa0ead35029f341eb9
    • affected 656e705243fd0c2864b89634ea16ed444ef64dc6 – < 42001839e425b2564b7297be579073a13a8fddf6
    • affected 656e705243fd0c2864b89634ea16ed444ef64dc6 – < 82be3d08de9e14d5aed72377f051adb4f09fd540
    • affected 656e705243fd0c2864b89634ea16ed444ef64dc6 – < 17eafd74de5a31e30361420a2e3ebf64186b77e5
    • affected 656e705243fd0c2864b89634ea16ed444ef64dc6 – < 6f0c2c4f5e7143eba75153ecc8af3a03f7b6a98b

  • Linux · Linux

    • affected 4.6
    • unaffected < 4.6
    • unaffected 6.6.160 – ≤ 6.6.*
    • unaffected 6.12.113 – ≤ 6.12.*
    • unaffected 6.18.56 – ≤ 6.18.*
    • unaffected 7.2.10 – ≤ 7.2.*
    • unaffected 7.3 – ≤ *

References

References5

Sources

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

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Record last updated .