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vuln-cve/data/2025/38xxx/CVE-2025-38604.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38604",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:24.028Z",
"datePublished": "2025-08-19T17:03:43.358Z",
"dateUpdated": "2026-08-05T12:03:25.920Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:03:25.920Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtl818x: Kill URBs before clearing tx status queue\n\nIn rtl8187_stop() move the call of usb_kill_anchored_urbs() before clearing\nb_tx_status.queue. This change prevents callbacks from using already freed\nskb due to anchor was not killed before freeing such skb.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000080\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 7 UID: 0 PID: 0 Comm: swapper/7 Not tainted 6.15.0 #8 PREEMPT(voluntary)\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015\n RIP: 0010:ieee80211_tx_status_irqsafe+0x21/0xc0 [mac80211]\n Call Trace:\n <IRQ>\n rtl8187_tx_cb+0x116/0x150 [rtl8187]\n __usb_hcd_giveback_urb+0x9d/0x120\n usb_giveback_urb_bh+0xbb/0x140\n process_one_work+0x19b/0x3c0\n bh_worker+0x1a7/0x210\n tasklet_action+0x10/0x30\n handle_softirqs+0xf0/0x340\n __irq_exit_rcu+0xcd/0xf0\n common_interrupt+0x85/0xa0\n </IRQ>\n\nTested on RTL8187BvE device.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The race is armed by locally bringing the wireless interface down (`ip link set wlan0 down` → `ieee80211_stop()` → `ieee80211_do_stop()` → `drv_stop()` → `rtl8187_stop()`) while local TX traffic keeps URBs in flight; no received 802.11 frame or routable packet can invoke the driver's stop callback, so an adjacent or remote peer cannot reach the vulnerable path.\nAC:L - The attacker owns both sides of the race — they flood the TX path to keep more than five entries in `b_tx_status.queue` (the exact precondition for the racing `skb_dequeue()` in `rtl8187_tx_cb()`'s drain loop) and then issue the interface-down, repeating the up/down cycle indefinitely until the window between the drain loop and `usb_kill_anchored_urbs()` is hit; `CONFIG_RTL8187` is a stock distro module, so no rare configuration is required.\nPR:L - Bringing the interface down requires CAP_NET_ADMIN over the network namespace owning the netdev, which an unprivileged user holds via `unshare -Ur` once the wiphy has been delegated into a container netns — the same reasoning applied to mac80211 configuration paths in CVE-2025-38642; on desktop deployments polkit additionally lets an active unprivileged session toggle WiFi through NetworkManager.\nUI:N - The attacker performs both the traffic generation and the interface down/up cycle themselves; no victim needs to open a file, mount anything, or take any other action.\nS:U - The freed/NULL sk_buff is dereferenced in the host kernel's own driver and mac80211 context, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The fix exists to stop URB completion callbacks from consuming skbs already released by `dev_kfree_skb_any()`; a freed `struct sk_buff` reallocated by a concurrent attacker-controlled allocation supplies the `ieee80211_hw *` read from `info->rate_driver_data[0]` and is then relinked into mac80211's status queues, yielding a controlled kernel-pointer dereference and read primitive.\nI:H - The same use-after-free window lets a sprayed replacement object drive `hw->priv` and the subsequent `ieee80211_tx_status_irqsafe()` queueing, and skbs re-queued by `rtl8187_tx_cb()` after the drain are later freed again, giving double-free and heap-corruption primitives exploitable for control-flow hijack.\nA:H - The reproduced impact on real RTL8187BvE hardware is a kernel oops from `ieee80211_tx_status_irqsafe()` dereferencing a NULL skb inside the USB giveback BH, which kills the softirq worker and wedges the WLAN device, and becomes a full panic on systems with `panic_on_oops`; the attacker can re-trigger it at will."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c"
],
"versions": [
{
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"lessThan": "e64732ebff9e24258e7326f07adbe2f2b990daf8",
"status": "affected",
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"status": "affected",
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"status": "affected",
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},
{
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{
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"lessThan": "14ca6952691fa8cc91e7644512e6ff24a595283f",
"status": "affected",
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"status": "affected",
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},
{
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"status": "affected",
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{
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"lessThan": "16d8fd74dbfca0ea58645cd2fca13be10cae3cdd",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c"
],
"versions": [
{
"version": "2.6.29",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.29",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.297",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.241",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.190",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.148",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.102",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15.10",
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16.1",
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.29",
"versionEndExcluding": "5.4.297"
},
{
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{
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{
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/e64732ebff9e24258e7326f07adbe2f2b990daf8"
},
{
"url": "https://git.kernel.org/stable/c/789415771422f4fb9f444044f86ecfaec55df1bd"
},
{
"url": "https://git.kernel.org/stable/c/c73c773b09e313278f9b960303a2809b8440bac6"
},
{
"url": "https://git.kernel.org/stable/c/8c767727f331fb9455b0f81daad832b5925688cb"
},
{
"url": "https://git.kernel.org/stable/c/14ca6952691fa8cc91e7644512e6ff24a595283f"
},
{
"url": "https://git.kernel.org/stable/c/7858a95566f4ebf59524666683d2dcdba3fca968"
},
{
"url": "https://git.kernel.org/stable/c/c51a45ad9070a6d296174fcbe5c466352836c12b"
},
{
"url": "https://git.kernel.org/stable/c/81cfe34d0630de4e23ae804dcc08fb6f861dc37d"
},
{
"url": "https://git.kernel.org/stable/c/16d8fd74dbfca0ea58645cd2fca13be10cae3cdd"
}
],
"title": "wifi: rtl818x: Kill URBs before clearing tx status queue",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:40:19.561Z"
}
}
]
}
}
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