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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/wcn36xx/smd.c"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "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": [
        {
          "cvssV3_1": {
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            "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"
      },
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          "url": "https://git.kernel.org/stable/c/22b0b8572a64362531dd0ed499b75e16282aeb2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cf92b44c4fb88a5e8de8733a4494c0956606bca"
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        {
          "url": "https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09"
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      ],
      "title": "wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication",
      "x_generator": {
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    "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"
  },
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      "date": "2026-09-21",
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                "product": "Linux",
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        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-74340",
        "lastModified": "2026-08-17T06:19:28.467",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
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              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T06:22:34.987",
        "references": [
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            "url": "https://git.kernel.org/stable/c/0907c06dccae9e3c8d5a68eb9014beec73a36e79"
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          {
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            "url": "https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f03782f7f41f2afee5076a1ef08ced5649218771"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f987efff29a5fe45320ea5991c9d5cb98b676953"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:19:37+00:00",
      "cve": "CVE-2026-74340",
      "id": "CVE-2026-74340",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74340.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:03:10Z",
      "cve": "CVE-2026-74340",
      "id": "CVE-2026-74340",
      "initial_release_date": "2026-08-27T16:51:44Z",
      "product_status:known_affected": "263",
      "product_status:known_not_affected": "99",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74340",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74340.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.