GHSA-29GW-9F65-5XH9
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: refuse to make a monitor active when it has no queue
A monitor interface only gets a TXQ if it's created active, and one can't be added later. Setting the flag on a down interface is still allowed, so the driver is handed a monitor with no queue. ath9k dereferences it:
BUG: kernel NULL pointer dereference, address: 0000000000000066 RIP: 0010:ath_tx_node_init+0x49/0x170 [ath9k] ath9k_add_interface+0x10c/0x140 [ath9k] drv_add_interface+0x54/0x250 [mac80211] ieee80211_do_open+0x32f/0x800 [mac80211]
Reached with CAP_NET_ADMIN by "iw dev X set monitor active" followed by "ip link set X up". RTNL is held, so netlink operations block behind it.
Refuse the flag when there is no queue to give.
{
"affected": [],
"aliases": [
"CVE-2026-98182"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:02Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: refuse to make a monitor active when it has no queue\n\nA monitor interface only gets a TXQ if it\u0027s created active, and one can\u0027t\nbe added later. Setting the flag on a down interface is still allowed, so\nthe driver is handed a monitor with no queue. ath9k dereferences it:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000066\n RIP: 0010:ath_tx_node_init+0x49/0x170 [ath9k]\n ath9k_add_interface+0x10c/0x140 [ath9k]\n drv_add_interface+0x54/0x250 [mac80211]\n ieee80211_do_open+0x32f/0x800 [mac80211]\n\nReached with CAP_NET_ADMIN by \"iw dev X set monitor active\" followed by\n\"ip link set X up\". RTNL is held, so netlink operations block behind it.\n\nRefuse the flag when there is no queue to give.",
"id": "GHSA-29gw-9f65-5xh9",
"modified": "2026-10-06T09:31:29Z",
"published": "2026-10-06T09:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98182"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b04d6556964ae9f89819b86a0a7801e39c3aae5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/46c223468537a05a404699771cd3e68532dab5e6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/abe15e643e576459469867758ae9c586a7bab95d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b7b7d46ec4fa127767931938b282c361c0519af6"
}
],
"schema_version": "1.4.0",
"severity": []
}
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