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CVE-2026-80943 (GCVE-0-2026-80943)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-13 06:28
VLAI
Title
wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids
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]'.
Severity
7.6 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8321424134a400a5e3eb39f9acca6bc6946ff447 , < 6e327f14e1c43e175bf530f9165b2cadff308553 (git)
Affected: 8321424134a400a5e3eb39f9acca6bc6946ff447 , < 0c0b374e12d52af23ca741728db31091677cf9dc (git)
Affected: 8321424134a400a5e3eb39f9acca6bc6946ff447 , < 42785f7e8d31540e6172bbcf08a7cc3cae1086f8 (git)
Affected: 8321424134a400a5e3eb39f9acca6bc6946ff447 , < ed4f05d9f2f42fd866f55108db8123eefcc5fb33 (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtlwifi/rtl8192du/trx.c"
          ],
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "6.11"
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              "versionType": "semver"
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                  "versionStartIncluding": "6.11",
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              "operator": "OR"
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          "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": {
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            "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": "2026-09-13T06:28:18.870Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553"
        },
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          "url": "https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33"
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      ],
      "title": "wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80943",
    "datePublished": "2026-09-11T19:42:15.341Z",
    "dateReserved": "2026-08-26T14:34:25.803Z",
    "dateUpdated": "2026-09-13T06:28:18.870Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-16",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T15:54:38+00:00",
      "cve": "CVE-2026-80943",
      "id": "CVE-2026-80943",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80943.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:05:52Z",
      "cve": "CVE-2026-80943",
      "id": "CVE-2026-80943",
      "initial_release_date": "2026-09-12T16:37:13Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80943",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80943.json",
      "version": "4"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.