CVE-2026-97595
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: mac802154: fix use-after-free of sdata via queued RX frames The RX softirq producer ieee802154_subif_frame() queues received beacon and MAC-command frames onto local->rx_beacon_list / rx_mac_cmd_list and schedules a process-context worker, storing a raw mac_pkt->sdata (and skb->dev == sdata->dev) with neither a reference nor any locking: - the lists have no lock: the softirq producer list_add_tail()s while the mac_wq worker list_del()s, so sibling interfaces on the same phy corrupt the list; - the workers dereference the interface after it may have been freed. mac802154_rx_mac_cmd_worker() touches mac_pkt->sdata directly, and mac802154_rx_beacon_worker() -> mac802154_process_beacon() dereferences skb->dev (== sdata->dev). Removing an interface frees its sdata (netdev_priv) while a queued frame still points at it, so a later worker run is a use-after-free. Reproduced under KASAN by flooding a victim interface with MAC command frames and removing it (the beacon path is the same class via skb->dev): BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154] Read of size 4 at addr ffff888002f9ea18 by task kworker/u8:1/31 Workqueue: phy0-mac-cmds mac802154_rx_mac_cmd_worker [mac802154] Call Trace: mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154] process_one_work+0x611/0xe80 worker_thread+0x52e/0xdc0 kthread+0x30c/0x630 ret_from_fork+0x2fd/0x3e0 Fix both lists together: - add local->rx_lock and take it around every list access: the softirq producer (plain spin_lock, softirq context) and the workers and flush (spin_lock_bh, process context); - pin the interface for the lifetime of a queued frame with netdev_hold()/netdev_put(), so the worker can safely dereference sdata / skb->dev even while the interface is being removed; - dequeue under the lock at the head and loop-drain the whole list in the workers (they previously processed one frame per run and relied on a later enqueue to drain the rest); - drop not-yet-started frames of an interface before it is unregistered, from ieee802154_if_remove() (after the RCU grace period) and from the ieee802154_remove_interfaces() loop -- the latter is the whole-phy teardown path, which does not go through ieee802154_if_remove(). An in-flight worker that already dequeued a frame keeps its own netdev reference; unregister_netdevice() then waits it out in netdev_run_todo(), which runs at rtnl_unlock() (rtnl released) and after the interface has been closed, so it does not pin rtnl. A worker blocked in an association TX only delays that one interface's unregister (the usual "waiting for %s to become free"), it does not hold rtnl. netdev_hold() is used for this reason instead of a cancel_work_sync() under rtnl, which would block on the worker's unbounded MLME TX wait via ieee802154_sync_queue(). The mac-command worker additionally skips processing for a stopped interface (ieee802154_sdata_running()), avoiding a needless association response during teardown.
View original CVE JSON
{
"id": "CVE-2026-97595",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-25T11:17:10.770",
"lastModified": "2026-10-19T10:17:29.053",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: fix use-after-free of sdata via queued RX frames\n\nThe RX softirq producer ieee802154_subif_frame() queues received beacon\nand MAC-command frames onto local->rx_beacon_list / rx_mac_cmd_list and\nschedules a process-context worker, storing a raw mac_pkt->sdata (and\nskb->dev == sdata->dev) with neither a reference nor any locking:\n\n - the lists have no lock: the softirq producer list_add_tail()s while the\n mac_wq worker list_del()s, so sibling interfaces on the same phy corrupt\n the list;\n\n - the workers dereference the interface after it may have been freed.\n mac802154_rx_mac_cmd_worker() touches mac_pkt->sdata directly, and\n mac802154_rx_beacon_worker() -> mac802154_process_beacon() dereferences\n skb->dev (== sdata->dev). Removing an interface frees its sdata\n (netdev_priv) while a queued frame still points at it, so a later worker\n run is a use-after-free.\n\nReproduced under KASAN by flooding a victim interface with MAC command\nframes and removing it (the beacon path is the same class via skb->dev):\n\n BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]\n Read of size 4 at addr ffff888002f9ea18 by task kworker/u8:1/31\n Workqueue: phy0-mac-cmds mac802154_rx_mac_cmd_worker [mac802154]\n Call Trace:\n mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]\n process_one_work+0x611/0xe80\n worker_thread+0x52e/0xdc0\n kthread+0x30c/0x630\n ret_from_fork+0x2fd/0x3e0\n\nFix both lists together:\n\n - add local->rx_lock and take it around every list access: the softirq\n producer (plain spin_lock, softirq context) and the workers and flush\n (spin_lock_bh, process context);\n\n - pin the interface for the lifetime of a queued frame with\n netdev_hold()/netdev_put(), so the worker can safely dereference sdata /\n skb->dev even while the interface is being removed;\n\n - dequeue under the lock at the head and loop-drain the whole list in the\n workers (they previously processed one frame per run and relied on a\n later enqueue to drain the rest);\n\n - drop not-yet-started frames of an interface before it is unregistered,\n from ieee802154_if_remove() (after the RCU grace period) and from the\n ieee802154_remove_interfaces() loop -- the latter is the whole-phy\n teardown path, which does not go through ieee802154_if_remove().\n\nAn in-flight worker that already dequeued a frame keeps its own netdev\nreference; unregister_netdevice() then waits it out in netdev_run_todo(),\nwhich runs at rtnl_unlock() (rtnl released) and after the interface has\nbeen closed, so it does not pin rtnl. A worker blocked in an association\nTX only delays that one interface's unregister (the usual \"waiting for %s\nto become free\"), it does not hold rtnl. netdev_hold() is used for this\nreason instead of a cancel_work_sync() under rtnl, which would block on\nthe worker's unbounded MLME TX wait via ieee802154_sync_queue().\n\nThe mac-command worker additionally skips processing for a stopped\ninterface (ieee802154_sdata_running()), avoiding a needless association\nresponse during teardown."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"include/net/cfg802154.h",
"net/mac802154/ieee802154_i.h",
"net/mac802154/iface.c",
"net/mac802154/main.c",
"net/mac802154/rx.c",
"net/mac802154/scan.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
"lessThan": "4826fd8373f684f9952536333ad45b26acd3455d",
"versionType": "git",
"status": "affected"
},
{
"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
"lessThan": "4740ef0518c5e3bf31ebfb2288a6ac3b462ead06",
"versionType": "git",
"status": "affected"
},
{
"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
"lessThan": "07f0214018d7241e3610c1be984c8abfce16c099",
"versionType": "git",
"status": "affected"
},
{
"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
"lessThan": "3d1fde35f95d7f02a7dc473c51d81e8d9e992cfc",
"versionType": "git",
"status": "affected"
},
{
"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
"lessThan": "2f37fba846c9fdff5fc15b6d93656057ccd13031",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"include/net/cfg802154.h",
"net/mac802154/ieee802154_i.h",
"net/mac802154/iface.c",
"net/mac802154/main.c",
"net/mac802154/rx.c",
"net/mac802154/scan.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.3",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.111",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.53",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.6,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/07f0214018d7241e3610c1be984c8abfce16c099",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2f37fba846c9fdff5fc15b6d93656057ccd13031",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3d1fde35f95d7f02a7dc473c51d81e8d9e992cfc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4740ef0518c5e3bf31ebfb2288a6ac3b462ead06",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4826fd8373f684f9952536333ad45b26acd3455d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}