CVE-2026-74411 (GCVE-0-2026-74411)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-08-17 05:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
wifi: rtw89: Correct data type for scan index to avoid infinite loop
A kernel soft lockup was observed during Wi-Fi scanning on the 6GHz band.
The CPU becomes stuck in rtw89_hw_scan_add_chan_ax for over 20 seconds,
leading to a system panic.
RIP points to 0f b6 c3 (movzbl %bl, %eax), which zero-extends
the low 8 bits of RBX into RAX.
RBX (the counter i) has reached a huge value: 0x137466a1.
watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [kworker/u16:4:6124]
Workqueue: events_unbound cfg80211_wiphy_work [cfg80211]
RIP: 0010:rtw89_hw_scan_add_chan_ax+0xb3/0x6e0 [rtw89_core]
Code: a0 48 89 45 a8 44 89 6d 9c 44 89 75 98 eb 29 66 66 2e 0f 1f
84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 c3 01
<0f> b6 c3 41 3b 44 24 74 0f 83 0b 02 00 00 0f b6 c3 48 8d 14 80 49
RSP: 0018:ffffcb48cbaa39f8 EFLAGS: 00000202
RAX: 0000000000000005 RBX: 00000000137466a1 RCX: 0000000000000000
RDX: ffff89ffc9d851a8 RSI: 0000000000004f0d RDI: 0000000096af0130
RBP: ffffcb48cbaa3a60 R08: 0000000000000000 R09: ffff8a00b7502080
R10: ffff8a00b75ff600 R11: 0000000000000000 R12: ffff89ffc7553870
R13: ffff8a00b7ac8f19 R14: ffff8a00b75020d8 R15: ffff89ffc3d54d80
FS: 0000000000000000(0000) GS:ffff8a014f962000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007558d7f9f4c4 CR3: 0000000178040001 CR4: 00000000001706f0
Call Trace:
<TASK>
rtw89_hw_scan_prep_chan_list_ax+0x8a/0x400 [rtw89_core]
rtw89_hw_scan_start+0x546/0x8a0 [rtw89_core]
? rtw89_fw_h2c_default_cmac_tbl+0x13c/0x1f0 [rtw89_core]
rtw89_ops_hw_scan+0xae/0x120 [rtw89_core]
drv_hw_scan+0xbb/0x180 [mac80211]
__ieee80211_start_scan+0x2fc/0x750 [mac80211]
ieee80211_request_scan+0xe/0x20 [mac80211]
ieee80211_scan+0x123/0x190 [mac80211]
rdev_scan+0x40/0x110 [cfg80211]
cfg80211_scan_6ghz+0x5a1/0xa30 [cfg80211]
By objdump with source:
for (i = 0; i < req->n_6ghz_params; i++) {
5fbc0: 83 c3 01 add $0x1,%ebx --> i++
5fbc3: 0f b6 c3 movzbl %bl,%eax --> get counter
fbc6: 41 3b 44 24 74 cmp 0x74(%r12),%eax
* RBX: 00000000137466a1 -> %bl = a1 -> EAX = 000000a1 (161)
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/wireless/realtek/rtw89/fw.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "966fbed4b4463fbcb49c5becf3f86eae776861bd",
"status": "affected",
"version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
"versionType": "git"
},
{
"lessThan": "05d46e30303275f21f13c951166d39c85df976d4",
"status": "affected",
"version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
"versionType": "git"
},
{
"lessThan": "7a1ab5fdcae896e20ca6d68fa0fbd2816cb7471f",
"status": "affected",
"version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
"versionType": "git"
},
{
"lessThan": "140fa699cfd0e18ab2f1497acd951fb3548610f5",
"status": "affected",
"version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
"versionType": "git"
},
{
"lessThan": "08fdcb529df6df3562dd2b0035f88dd5be8b3c68",
"status": "affected",
"version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/wireless/realtek/rtw89/fw.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"lessThan": "6.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "6.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: Correct data type for scan index to avoid infinite loop\n\nA kernel soft lockup was observed during Wi-Fi scanning on the 6GHz band.\nThe CPU becomes stuck in rtw89_hw_scan_add_chan_ax for over 20 seconds,\nleading to a system panic.\n\nRIP points to 0f b6 c3 (movzbl %bl, %eax), which zero-extends\nthe low 8 bits of RBX into RAX.\nRBX (the counter i) has reached a huge value: 0x137466a1.\n\n watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [kworker/u16:4:6124]\n Workqueue: events_unbound cfg80211_wiphy_work [cfg80211]\n RIP: 0010:rtw89_hw_scan_add_chan_ax+0xb3/0x6e0 [rtw89_core]\n Code: a0 48 89 45 a8 44 89 6d 9c 44 89 75 98 eb 29 66 66 2e 0f 1f\n 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 c3 01\n \u003c0f\u003e b6 c3 41 3b 44 24 74 0f 83 0b 02 00 00 0f b6 c3 48 8d 14 80 49\n RSP: 0018:ffffcb48cbaa39f8 EFLAGS: 00000202\n RAX: 0000000000000005 RBX: 00000000137466a1 RCX: 0000000000000000\n RDX: ffff89ffc9d851a8 RSI: 0000000000004f0d RDI: 0000000096af0130\n RBP: ffffcb48cbaa3a60 R08: 0000000000000000 R09: ffff8a00b7502080\n R10: ffff8a00b75ff600 R11: 0000000000000000 R12: ffff89ffc7553870\n R13: ffff8a00b7ac8f19 R14: ffff8a00b75020d8 R15: ffff89ffc3d54d80\n FS: 0000000000000000(0000) GS:ffff8a014f962000(0000)\n knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007558d7f9f4c4 CR3: 0000000178040001 CR4: 00000000001706f0\n Call Trace:\n \u003cTASK\u003e\n rtw89_hw_scan_prep_chan_list_ax+0x8a/0x400 [rtw89_core]\n rtw89_hw_scan_start+0x546/0x8a0 [rtw89_core]\n ? rtw89_fw_h2c_default_cmac_tbl+0x13c/0x1f0 [rtw89_core]\n rtw89_ops_hw_scan+0xae/0x120 [rtw89_core]\n drv_hw_scan+0xbb/0x180 [mac80211]\n __ieee80211_start_scan+0x2fc/0x750 [mac80211]\n ieee80211_request_scan+0xe/0x20 [mac80211]\n ieee80211_scan+0x123/0x190 [mac80211]\n rdev_scan+0x40/0x110 [cfg80211]\n cfg80211_scan_6ghz+0x5a1/0xa30 [cfg80211]\n\nBy objdump with source:\n\n\tfor (i = 0; i \u003c req-\u003en_6ghz_params; i++) {\n 5fbc0:\t83 c3 01 \tadd $0x1,%ebx --\u003e i++\n 5fbc3:\t0f b6 c3 \tmovzbl %bl,%eax --\u003e get counter\n fbc6:\t41 3b 44 24 74 \tcmp 0x74(%r12),%eax\n\n * RBX: 00000000137466a1 -\u003e %bl = a1 -\u003e EAX = 000000a1 (161)"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The flaw is in the rtw89 WiFi driver scan path; an attacker on the same wireless segment can inject forged RNR/beacon frames to inflate n_6ghz_params above 255, triggering the vulnerable loop during cfg80211 6GHz split-scan processing.\nAC:L - An attacker can reliably flood the BSS cache with 256+ colocated 6GHz AP entries via crafted beacons and wait for routine background or split-scan 6GHz scans on rtw89 hardware; no race or rare configuration outside attacker control is required.\nPR:N - Exploitation requires only transmitting WiFi frames on the victim\u0027s RF segment to poison scan inputs; the attacker needs no local account, capability, or namespace privilege on the victim host.\nUI:N - The bug fires during automatic kernel/WiFi-stack scanning, including the split-scan 6GHz phase after legacy-band scans; victims need not perform any explicit action beyond normal powered-on operation.\nS:U - Impact is kernel soft lockup/panic and potential heap out-of-bounds access within kernel space; it does not cross VM, container, or IOMMU boundaries to another security authority.\nC:H - The u8 loop counter truncates at 256 while the index register grows unboundedly, causing out-of-bounds reads of scan_6ghz_params and attacker-influenced channel_idx values used to dereference req-\u003echannels[].\nI:H - The same out-of-bounds indexing drives writes (probe-request skb setup, firmware offload, heap list updates) using corrupted param data, enabling memory corruption beyond simple denial of service.\nA:H - Confirmed kernel soft lockup exceeding 26 seconds in rtw89_hw_scan_add_chan_ax with watchdog-forced panic, rendering the system unavailable until reboot."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:46:54.903Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/966fbed4b4463fbcb49c5becf3f86eae776861bd"
},
{
"url": "https://git.kernel.org/stable/c/05d46e30303275f21f13c951166d39c85df976d4"
},
{
"url": "https://git.kernel.org/stable/c/7a1ab5fdcae896e20ca6d68fa0fbd2816cb7471f"
},
{
"url": "https://git.kernel.org/stable/c/140fa699cfd0e18ab2f1497acd951fb3548610f5"
},
{
"url": "https://git.kernel.org/stable/c/08fdcb529df6df3562dd2b0035f88dd5be8b3c68"
}
],
"title": "wifi: rtw89: Correct data type for scan index to avoid infinite loop",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74411",
"datePublished": "2026-08-15T05:59:18.696Z",
"dateReserved": "2026-08-15T05:44:03.892Z",
"dateUpdated": "2026-08-17T05:46:54.903Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…