net: ethernet: mtk_eth_soc: allocate dummy netdev sooner
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.
CVE-2026-98796
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98796
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "656e705243fd0c2864b89634ea16ed444ef64dc6",
"lessThan": "efc91ab1d97bd991faf50baa0ead35029f341eb9",
"versionType": "git"
},
{
"status": "affected",
"version": "656e705243fd0c2864b89634ea16ed444ef64dc6",
"lessThan": "42001839e425b2564b7297be579073a13a8fddf6",
"versionType": "git"
},
{
"status": "affected",
"version": "656e705243fd0c2864b89634ea16ed444ef64dc6",
"lessThan": "82be3d08de9e14d5aed72377f051adb4f09fd540",
"versionType": "git"
},
{
"status": "affected",
"version": "656e705243fd0c2864b89634ea16ed444ef64dc6",
"lessThan": "17eafd74de5a31e30361420a2e3ebf64186b77e5",
"versionType": "git"
},
{
"status": "affected",
"version": "656e705243fd0c2864b89634ea16ed444ef64dc6",
"lessThan": "6f0c2c4f5e7143eba75153ecc8af3a03f7b6a98b",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/mediatek/mtk_eth_soc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/mediatek/mtk_eth_soc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98796
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48983 · Revision 1
- Added to Heist Feed
- Publisher date