211 lines
14 KiB
JSON
211 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-97595",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-24T16:01:01.157Z",
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"datePublished": "2026-09-25T10:22:11.134Z",
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"dateUpdated": "2026-10-19T09:09:59.016Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:09:59.016Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:A - ieee802154_subif_frame() queues every received IEEE 802.15.4 MAC command frame (and beacons during a scan) onto local->rx_mac_cmd_list/rx_beacon_list from the RX tasklet with no lock, so a sender in radio range supplies the frames that race the mac_wq worker; 802.15.4 is a radio link, so this is adjacent rather than network.\nAC:H - A remote attacker only reaches the bug by making the tasklet's unlocked list_add_tail() collide with the worker's list_del() on another CPU. They control the flood but not the worker's timing, and the window is a few pointer writes. The use-after-free of sdata also needs an interface removal that the remote attacker cannot cause.\nPR:N - __ieee802154_rx_handle_packet() hands every parsed frame to each running non-monitor interface, and ieee802154_subif_frame() queues MAC command frames with no association or scan state required; unsecured frames pass mac802154_llsec_decrypt(), so no credentials are needed.\nUI:N - The victim only needs a running 802.15.4 interface, which is its normal operating state; the attacker sends the frames and the kernel queues and processes them without any user action.\nS:U - The corruption stays within the host kernel (mac802154 RX lists, cfg802154_mac_pkt, netdev_priv sdata) and crosses no VM or IOMMU boundary.\nC:H - A corrupted rx_mac_cmd_list or rx_beacon_list lets the worker dereference freed cfg802154_mac_pkt entries, their skb and sdata. Reclaimed slab contents are then read as kernel pointers, a use-after-free read that can disclose kernel memory.\nI:H - The worker does list_del(), kfree() and kfree_skb() on stale mac_pkt entries, and mac802154_process_association_req/resp() write through the freed sdata, giving write and double-free primitives on reclaimable slab memory.\nA:H - List corruption or the sdata use-after-free in mac802154_rx_mac_cmd_worker() or mac802154_rx_beacon_worker() causes a kernel oops; the commit's KASAN report shows such a slab-use-after-free."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/net/cfg802154.h",
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"net/mac802154/ieee802154_i.h",
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"net/mac802154/iface.c",
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"net/mac802154/main.c",
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"net/mac802154/rx.c",
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"net/mac802154/scan.c"
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],
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"versions": [
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"lessThan": "4826fd8373f684f9952536333ad45b26acd3455d",
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"status": "affected",
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"versionType": "git"
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"lessThan": "4740ef0518c5e3bf31ebfb2288a6ac3b462ead06",
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"status": "affected",
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},
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{
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"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
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"lessThan": "07f0214018d7241e3610c1be984c8abfce16c099",
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"status": "affected",
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},
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"version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
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"lessThan": "3d1fde35f95d7f02a7dc473c51d81e8d9e992cfc",
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"status": "affected",
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"lessThan": "2f37fba846c9fdff5fc15b6d93656057ccd13031",
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"status": "affected",
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/net/cfg802154.h",
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"net/mac802154/ieee802154_i.h",
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"net/mac802154/iface.c",
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"net/mac802154/main.c",
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"net/mac802154/rx.c",
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"net/mac802154/scan.c"
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],
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"versions": [
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{
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"version": "6.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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"references": [
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"url": "https://git.kernel.org/stable/c/4826fd8373f684f9952536333ad45b26acd3455d"
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},
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{
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"url": "https://git.kernel.org/stable/c/4740ef0518c5e3bf31ebfb2288a6ac3b462ead06"
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"url": "https://git.kernel.org/stable/c/07f0214018d7241e3610c1be984c8abfce16c099"
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}
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],
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"title": "mac802154: fix use-after-free of sdata via queued RX frames",
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