Vulnerability-Lookup

GHSA-9FWG-3FVG-FM8H

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication

The firmware-controlled rsp->count field is used as the loop bound for indexing into the flexible rsp->regs[] array without validation against the message length. A count exceeding the actual data causes out-of- bounds reads from the heap-allocated message buffer.

Add a check that count fits within the received message.

Severity

8.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74340"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:34Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication\n\nThe firmware-controlled rsp-\u003ecount field is used as the loop bound for\nindexing into the flexible rsp-\u003eregs[] array without validation against\nthe message length. A count exceeding the actual data causes out-of-\nbounds reads from the heap-allocated message buffer.\n\nAdd a check that count fits within the received message.",
  "id": "GHSA-9fwg-3fvg-fm8h",
  "modified": "2026-08-17T06:33:39Z",
  "published": "2026-08-15T06:32:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74340"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0907c06dccae9e3c8d5a68eb9014beec73a36e79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22b0b8572a64362531dd0ed499b75e16282aeb2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/23d210877968657bd07e1a517e0b516db20a1d80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cf92b44c4fb88a5e8de8733a4494c0956606bca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64228dfc4247aca178c01e5a37af7d8dcc7a6089"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f03782f7f41f2afee5076a1ef08ced5649218771"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f987efff29a5fe45320ea5991c9d5cb98b676953"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74340 (GCVE-0-2026-74340)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46

Title

wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication The firmware-controlled rsp->count field is used as the loop bound for indexing into the flexible rsp->regs[] array without validation against the message length. A count exceeding the actual data causes out-of- bounds reads from the heap-allocated message buffer. Add a check that count fits within the received message.

Severity

8.1 (High)


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

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/22b0b8572a6436253…
https://git.kernel.org/stable/c/3cf92b44c4fb88a5e…
https://git.kernel.org/stable/c/0907c06dccae9e3c8…
https://git.kernel.org/stable/c/64228dfc4247aca17…
https://git.kernel.org/stable/c/23d210877968657bd…
https://git.kernel.org/stable/c/f03782f7f41f2afee…
https://git.kernel.org/stable/c/f987efff29a5fe453…
https://git.kernel.org/stable/c/df2187acfca6c6cca…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < 22b0b8572a64362531dd0ed499b75e16282aeb2b (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < 3cf92b44c4fb88a5e8de8733a4494c0956606bca (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < 0907c06dccae9e3c8d5a68eb9014beec73a36e79 (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < 64228dfc4247aca178c01e5a37af7d8dcc7a6089 (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < 23d210877968657bd07e1a517e0b516db20a1d80 (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < f03782f7f41f2afee5076a1ef08ced5649218771 (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < f987efff29a5fe45320ea5991c9d5cb98b676953 (git) Affected: 43efa3c0f241e04862be8e6a68ff765d36cde1ba , < df2187acfca6c6cca372c5d35f42394d9c270b09 (git)
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (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"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "22b0b8572a64362531dd0ed499b75e16282aeb2b",
              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            },
            {
              "lessThan": "3cf92b44c4fb88a5e8de8733a4494c0956606bca",
              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            },
            {
              "lessThan": "0907c06dccae9e3c8d5a68eb9014beec73a36e79",
              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            },
            {
              "lessThan": "64228dfc4247aca178c01e5a37af7d8dcc7a6089",
              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            },
            {
              "lessThan": "23d210877968657bd07e1a517e0b516db20a1d80",
              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            },
            {
              "lessThan": "f03782f7f41f2afee5076a1ef08ced5649218771",
              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
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              "status": "affected",
              "version": "43efa3c0f241e04862be8e6a68ff765d36cde1ba",
              "versionType": "git"
            }
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "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": "5.10.261",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication\n\nThe firmware-controlled rsp-\u003ecount field is used as the loop bound for\nindexing into the flexible rsp-\u003eregs[] array without validation against\nthe message length. A count exceeding the actual data causes out-of-\nbounds reads from the heap-allocated message buffer.\n\nAdd a check that count fits within the received message."
        }
      ],
      "metrics": [
        {
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            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is reached when WCN3660/3680 firmware delivers a PRINT_REG_INFO_IND over the WLAN_CTRL rpmsg channel; crafted 802.11 traffic in radio range can cause the firmware to emit this malformed indication on Qualcomm Android phones and tablets using wcn36xx.\nAC:L - An adjacent attacker can repeatedly transmit WiFi frames during background scanning or association to elicit the firmware indication, then set count far above the short rpmsg payload; the driver loop performs deterministic out-of-bounds reads until a fault occurs.\nPR:N - Exploitation requires no local account or kernel privileges on the victim; only radio proximity to a device with the wcn36xx driver loaded and WiFi active, which is the default state on typical mobile deployments of this chipset.\nUI:N - No specific victim action beyond normal WiFi operation is required; phones continuously scan and associate automatically, allowing an adjacent attacker to trigger the firmware indication passively or via a rogue access point.\nS:U - The out-of-bounds read occurs in kernel heap memory during wcn36xx firmware message handling, enabling standard kernel information disclosure or denial of service rather than crossing a VM, IOMMU, or other separate security authority boundary.\nC:H - The unchecked firmware count allows unbounded out-of-bounds reads from the kmalloc_flex indication buffer into adjacent kernel heap objects; with debug_mask set the leaked register values are printed to the kernel log, and the reads themselves expose sensitive heap contents.\nI:N - This is a read-only out-of-bounds access that indexes past the message buffer without writing memory; the loop only reads addr/value pairs for debug logging and does not corrupt heap metadata or provide an arbitrary write primitive.\nA:H - A firmware-controlled count near UINT_MAX causes the handler to perform massive out-of-bounds reads past the kmalloc allocation, reliably triggering a kernel page fault, oops, or panic and denying all system and wireless availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:06.162Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/22b0b8572a64362531dd0ed499b75e16282aeb2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cf92b44c4fb88a5e8de8733a4494c0956606bca"
        },
        {
          "url": "https://git.kernel.org/stable/c/0907c06dccae9e3c8d5a68eb9014beec73a36e79"
        },
        {
          "url": "https://git.kernel.org/stable/c/64228dfc4247aca178c01e5a37af7d8dcc7a6089"
        },
        {
          "url": "https://git.kernel.org/stable/c/23d210877968657bd07e1a517e0b516db20a1d80"
        },
        {
          "url": "https://git.kernel.org/stable/c/f03782f7f41f2afee5076a1ef08ced5649218771"
        },
        {
          "url": "https://git.kernel.org/stable/c/f987efff29a5fe45320ea5991c9d5cb98b676953"
        },
        {
          "url": "https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09"
        }
      ],
      "title": "wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74340",
    "datePublished": "2026-08-15T05:58:30.558Z",
    "dateReserved": "2026-08-15T05:44:03.885Z",
    "dateUpdated": "2026-08-17T05:46:06.162Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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GHSA-9FWG-3FVG-FM8H

CVE-2026-74340 (GCVE-0-2026-74340)

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