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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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          "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."
        }
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              "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."
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      "title": "wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication",
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    "dateReserved": "2026-08-15T05:44:03.885Z",
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    "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"
    }
  }
}



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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

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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.