CVE-2026-74411 (GCVE-0-2026-74411)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-10-16 19:05
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Vendor Product Version
Linux Linux Version: c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0
Version: c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0
Version: c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0
Version: c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0
Version: c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0
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                "id": "CVE-2026-74411",
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                "timestamp": "2026-10-16T18:56:08.056968Z",
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          "shortName": "CISA-ADP"
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          "product": "Linux",
          "programFiles": [
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      "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)"
        }
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            "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": [
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              "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."
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        "dateUpdated": "2026-08-17T05:46:54.903Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/966fbed4b4463fbcb49c5becf3f86eae776861bd"
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        {
          "url": "https://git.kernel.org/stable/c/05d46e30303275f21f13c951166d39c85df976d4"
        },
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          "url": "https://git.kernel.org/stable/c/7a1ab5fdcae896e20ca6d68fa0fbd2816cb7471f"
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        },
        {
          "url": "https://git.kernel.org/stable/c/08fdcb529df6df3562dd2b0035f88dd5be8b3c68"
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      ],
      "title": "wifi: rtw89: Correct data type for scan index to avoid infinite loop",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74411",
    "datePublished": "2026-08-15T05:59:18.696Z",
    "dateReserved": "2026-08-15T05:44:03.892Z",
    "dateUpdated": "2026-10-16T19:05:44.122Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-74411\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T18:56:08.056968Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T18:56:08.987Z\"}}], \"cna\": {\"title\": \"wifi: rtw89: Correct data type for scan index to avoid infinite loop\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0\", \"lessThan\": \"966fbed4b4463fbcb49c5becf3f86eae776861bd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0\", \"lessThan\": \"05d46e30303275f21f13c951166d39c85df976d4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0\", \"lessThan\": \"7a1ab5fdcae896e20ca6d68fa0fbd2816cb7471f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0\", \"lessThan\": \"140fa699cfd0e18ab2f1497acd951fb3548610f5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0\", \"lessThan\": \"08fdcb529df6df3562dd2b0035f88dd5be8b3c68\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/wireless/realtek/rtw89/fw.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/wireless/realtek/rtw89/fw.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"6.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:46:54.903Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74411\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:05:44.122Z\", \"dateReserved\": \"2026-08-15T05:44:03.892Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:59:18.696Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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