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CVE-2026-74408 (GCVE-0-2026-74408)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
Title
wifi: ath9k: fix OOB access from firmware tx status queue ID
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: fix OOB access from firmware tx status queue ID ath_tx_edma_tasklet() accesses sc->tx.txq[ts.qid] where ts.qid is a 4-bit hardware field (0-15), but the txq array only has ATH9K_NUM_TX_QUEUES (10) entries. A qid >= 10 causes an OOB array access. Add a bounds check on ts.qid before using it as an array index.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < fb11083db9d7d6fb8f98bbba1cbfcf3fb7b4bf54 (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < 734db72d55ca578a344dfa33e30145032c074b25 (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < f5931d06b45ed402572bfe5832fff15864ef5481 (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < 46ca1451f61b598f45cb5259e066d305444d95fc (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < a9e055ac62cb3fcea262d4b687ec73eed82b3379 (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < 5435fd3edcb11c7cc4002847c83e9a50b49284dc (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < 336d4c8cd9b1646060ee690c881d465dfc09c6c0 (git)
Affected: fce041beb03f93c7a771f0b4b6c45bb71ef90901 , < 7ce2f118a2389e8f0a64068c6fe7cc7d40639be0 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (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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                  "versionStartIncluding": "3.1",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath9k: fix OOB access from firmware tx status queue ID\n\nath_tx_edma_tasklet() accesses sc-\u003etx.txq[ts.qid] where ts.qid is a\n4-bit hardware field (0-15), but the txq array only has\nATH9K_NUM_TX_QUEUES (10) entries. A qid \u003e= 10 causes an OOB array\naccess.\n\nAdd a bounds check on ts.qid before using it as an array index."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:A - Exploitation requires sending 802.11 frames over WiFi to a victim using an EDMA-capable ath9k device (routers, embedded APs, laptops); TX completion interrupts from that traffic reach ath_tx_edma_tasklet() via ath_isr/ath9k_interrupt.\nAC:L - An adjacent attacker can repeatedly induce TX completions and error/status conditions with crafted or high-volume 802.11 traffic; they control timing and load on both sides of the race, making invalid firmware qid values (10-15) reachable without conditions outside attacker influence.\nPR:N - No local account or kernel privileges are required; unauthenticated adjacent WiFi frames (probes, data, deauth/flood) cause the victim radio to transmit and process firmware TX status reports on the interrupt path.\nUI:N - No victim interaction is needed beyond the device having WiFi active, which is the normal operating state for routers, phones, and IoT APs using ath9k hardware.\nS:U - Impact is confined to kernel memory corruption and privilege escalation or denial of service on the affected host; it does not cross VM, container, or IOMMU security boundaries.\nC:H - Out-of-bounds indexing of sc-\u003etx.txq[ts.qid] reads adjacent ath_softc/ath_tx fields as struct ath_txq (spinlocks, list heads, DMA metadata), constituting an unbounded OOB kernel memory read exploitable for information disclosure.\nI:H - The OOB txq pointer is dereferenced for spin_lock_bh, list_head manipulation, and ath_tx_process_buffer(), writing through misaligned kernel structures and enabling heap corruption and potential arbitrary code execution.\nA:H - Locking and list operations on memory interpreted as the wrong ath_txq can cause kernel oops, panic, or hang, and repeated adjacent triggering can sustain denial of service on the wireless host."
            }
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        "dateUpdated": "2026-08-17T05:46:51.612Z",
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          "url": "https://git.kernel.org/stable/c/7ce2f118a2389e8f0a64068c6fe7cc7d40639be0"
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      "title": "wifi: ath9k: fix OOB access from firmware tx status queue ID",
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    "dateReserved": "2026-08-15T05:44:03.892Z",
    "dateUpdated": "2026-08-17T05:46:51.612Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:18:22+00:00",
      "cve": "CVE-2026-74408",
      "id": "CVE-2026-74408",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: ath9k: fix OOB access from firmware tx status queue ID",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74408.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.