Vulnerability-Lookup

GHSA-5GCP-MJQF-M8MF

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-29 09:30

Details

In the Linux kernel, the following vulnerability has been resolved:

wifi: wcn36xx: fix OOB read from short trigger BA firmware response

The firmware response length is only checked against sizeof(*rsp) (20 bytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read at buf + 20 without verifying the response contains it. This causes an out-of-bounds read of stale heap data, corrupting the BA session state.

Add validation that the response includes the candidate data.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80635"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:48Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from short trigger BA firmware response\n\nThe firmware response length is only checked against sizeof(*rsp) (20\nbytes), but when candidate_cnt \u003e= 1, a 22-byte candidate struct is read\nat buf + 20 without verifying the response contains it. This causes an\nout-of-bounds read of stale heap data, corrupting the BA session state.\n\nAdd validation that the response includes the candidate data.",
  "id": "GHSA-5gcp-mjqf-m8mf",
  "modified": "2026-08-29T09:30:26Z",
  "published": "2026-08-28T09:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80635"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/04aba50212f9f274e1a726fb3873b5ce8da2d821"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5e6f21923ca89d90256e7346301056f6502691e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c07aa0534d50361183833e3803204044cf1d0476"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-80635 (GCVE-0-2026-80635)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-29 06:21

Title

wifi: wcn36xx: fix OOB read from short trigger BA firmware response

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: wcn36xx: fix OOB read from short trigger BA firmware response The firmware response length is only checked against sizeof(*rsp) (20 bytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read at buf + 20 without verifying the response contains it. This causes an out-of-bounds read of stale heap data, corrupting the BA session state. Add validation that the response includes the candidate data.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/04aba50212f9f274e…
https://git.kernel.org/stable/c/c07aa0534d5036118…
https://git.kernel.org/stable/c/d0b57bcd0dac6e2c9…
https://git.kernel.org/stable/c/af8f0ea1f0a3a5fb5…
https://git.kernel.org/stable/c/d0cafe6ed8d1f6d00…
https://git.kernel.org/stable/c/b5e6f21923ca89d90…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < 04aba50212f9f274e1a726fb3873b5ce8da2d821 (git) Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < c07aa0534d50361183833e3803204044cf1d0476 (git) Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35 (git) Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee (git) Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2 (git) Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < b5e6f21923ca89d90256e7346301056f6502691e (git)
Linux	Linux	Affected: 4.7 Unaffected: 0 , < 4.7 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/wcn36xx/smd.c"
          ],
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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          "nodes": [
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              "cpeMatch": [
                {
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from short trigger BA firmware response\n\nThe firmware response length is only checked against sizeof(*rsp) (20\nbytes), but when candidate_cnt \u003e= 1, a 22-byte candidate struct is read\nat buf + 20 without verifying the response contains it. This causes an\nout-of-bounds read of stale heap data, corrupting the BA session state.\n\nAdd validation that the response includes the candidate data."
        }
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            {
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              "value": "AV:A - The bug is in parsing a WLAN firmware HAL response during TX block-ack setup; that path is reached only when an adjacent 802.11 peer drives AMPDU/BA negotiation over WiFi, not via remote IP or local syscalls.\nAC:L - An adjacent attacker can repeatedly send QoS data to a victim using wcn36xx to force ieee80211_start_tx_ba_session and wcn36xx_smd_trigger_ba, retrying until firmware returns a short TRIGGER_BA_RSP with candidate_cnt\u003e=1.\nPR:N - Exploitation requires only wireless adjacency as an associated AP or client peer; no Linux account, capabilities, or user-namespace privileges on the victim host are needed.\nUI:N - The victim needs no deliberate action beyond normal WiFi use; the attacker triggers BA setup by sending traffic that causes automatic AMPDU aggregation on the victim interface.\nS:U - Impact is confined to the kernel WiFi driver and its firmware session state on the same host; it does not cross VM, container, or IOMMU security boundaries.\nC:H - When candidate_cnt\u003e=1 but the response is only 20 bytes, the driver OOB-reads a 22-byte candidate from stale hal_buf data beyond the message, disclosing adjacent kernel buffer contents that may include prior HAL keying material.\nI:H - Stale OOB data is copied into ba_info and used as the block-ack starting sequence number for wcn36xx_smd_add_ba_session, corrupting BA session state and subsequent driver/firmware behavior.\nA:H - Corrupted block-ack parameters and malformed firmware/driver state can destabilize the WLAN subsystem, causing connection loss, firmware/driver errors, or kernel crashes under repeated attack."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:35.535Z",
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        {
          "url": "https://git.kernel.org/stable/c/b5e6f21923ca89d90256e7346301056f6502691e"
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      "title": "wifi: wcn36xx: fix OOB read from short trigger BA firmware response",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80635",
    "datePublished": "2026-08-28T06:48:49.637Z",
    "dateReserved": "2026-08-26T14:34:25.777Z",
    "dateUpdated": "2026-08-29T06:21:35.535Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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