CVE-2026-80943 (GCVE-0-2026-80943)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:45
Severity ?
7.6 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids rtl92du_tx_fill_desc() uses ieee80211_get_tid() to read the QoS TID from the 802.11 header and then uses it as an index into sta_entry->tids[]. ieee80211_get_tid() returns the low 4-bit QoS TID value, so the result can be in the range 0..15. rtlwifi only allocates MAX_TID_COUNT entries for sta_entry->tids[], and MAX_TID_COUNT is 9. A QoS TID greater than 8 therefore indexes past the aggregation state array. Keep the default RTL_AGG_STOP state for out-of-range TIDs, matching rtl92cu_tx_fill_desc(). This issue was detected by our static analysis tool and confirmed by manual audit. UBSAN validation for the same bug pattern reports an array-index-out-of-bounds access with index 10 for type 'rtl_tid_data [9]'.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8321424134a400a5e3eb39f9acca6bc6946ff447
Version: 8321424134a400a5e3eb39f9acca6bc6946ff447
Version: 8321424134a400a5e3eb39f9acca6bc6946ff447
Version: 8321424134a400a5e3eb39f9acca6bc6946ff447
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtlwifi/rtl8192du/trx.c"
          ],
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        {
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            "drivers/net/wireless/realtek/rtlwifi/rtl8192du/trx.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.11"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.11",
                  "vulnerable": true
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                  "versionEndExcluding": "6.18.50",
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                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtlwifi: rtl8192du: check QoS TID before indexing tids\n\nrtl92du_tx_fill_desc() uses ieee80211_get_tid() to read the QoS TID\nfrom the 802.11 header and then uses it as an index into\nsta_entry-\u003etids[]. ieee80211_get_tid() returns the low 4-bit QoS TID\nvalue, so the result can be in the range 0..15.\n\nrtlwifi only allocates MAX_TID_COUNT entries for sta_entry-\u003etids[], and\nMAX_TID_COUNT is 9. A QoS TID greater than 8 therefore indexes past the\naggregation state array. Keep the default RTL_AGG_STOP state for\nout-of-range TIDs, matching rtl92cu_tx_fill_desc().\n\nThis issue was detected by our static analysis tool and confirmed by\nmanual audit. UBSAN validation for the same bug pattern reports an\narray-index-out-of-bounds access with index 10 for type\n\u0027rtl_tid_data [9]\u0027."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - An adjacent Wi-Fi peer can trigger automatic open-mesh peering responses; ieee80211_get_tid() treats the self-protected action category 15 as a QoS TID, so rtl92du_tx_fill_desc() is reached over the wireless link.\nAC:L - A valid peering-open frame deterministically allocates an authorized station and transmits a category-15 action frame into the vulnerable TX descriptor path; no race or other condition outside the attacker\u0027s control is required.\nPR:N - Open 802.11s mesh accepts self-protected peering frames from unknown peers and automatically inserts an authorized station, so no credentials or local capabilities are required.\nUI:N - Once the rtl8192du interface is operating as a mesh point, mac80211 processes the attacker\u0027s frame and transmits the peering response without further victim action.\nS:U - The out-of-bounds access and any resulting crash remain in the host kernel and wireless device security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:L - The bug reads one agg_state byte at a TID-selected offset; TIDs 9-15 index past tids[9] into adjacent heap, yielding only a tightly bounded heap-state oracle rather than arbitrary disclosure.\nI:L - The access does not overwrite kernel memory or provide an arbitrary-write primitive; the fetched byte can only influence AMPDU/RTS TX descriptor fields, giving limited transmission integrity impact.\nA:H - UBSAN trap or panic-on-warning kernels can oops or panic on the deterministic bounds violation, and an adjacent peer can retrigger it after recovery."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:45:27.392Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33"
        }
      ],
      "title": "wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80943",
    "datePublished": "2026-09-11T19:42:15.341Z",
    "dateReserved": "2026-08-26T14:34:25.803Z",
    "dateUpdated": "2026-10-19T08:45:27.392Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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