CVE-2026-68373 (GCVE-0-2026-68373)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:34
VLAI
Title
wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off.
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: 1264b951463a00efebe1bb596499aaad620ec8af , < cb831aff2f850f72bc5ff5ad77d0a70bb5a84061 (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < 4875680d1703f56afa6257ba30244f2fb44ed205 (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < b406f33d234f98c8b310fdab5cbb492d85e98e49 (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < e165a1d295e7e814e13b0f92c86e5d48309509ce (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < bcde7249d45f52f994a9872bedf45994472ade77 (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < fb1b50ab699211e777dca5ccfb648788b6a6e519 (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < f742d9c98b5c504fc9e6744eef13a721c2aea486 (git)
Affected: 1264b951463a00efebe1bb596499aaad620ec8af , < 61a799ffd1e5a4fd3702d547828b7ff3d161468e (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: at76c50x-usb: avoid length underflow in at76_guess_freq()\n\nat76_guess_freq() checks only that the received frame is at least a bare\n802.11 header (24 bytes) before subtracting the fixed management-body\noffset:\n\n\tlen -= el_off;\n\nFor both beacon and probe response frames, el_off is 36. If the frame is\nshorter than el_off, subtracting it causes the calculated IE length to\nwrap. The length is eventually passed to cfg80211_find_elem_match() as a\nvery large unsigned value, so the element walk runs beyond the RX skb.\n\nThis path is reached from at76_rx_tasklet() while scanning. If the device\ndelivers a truncated beacon or probe response, the oversized IE length\ncauses an out-of-bounds read during scanning.\n\nSkip the IE lookup if the frame does not reach the variable elements,\nbefore subtracting el_off."
        }
      ],
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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"
          },
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              "lang": "en",
              "value": "AV:A - The malformed frame is an over-the-air 802.11 beacon or probe response received by the at76c50x USB WLAN dongle and parsed in at76_rx_tasklet(); an attacker only needs to be within radio range of the victim, which is the adjacent-network (WiFi frame injection) case.\nAC:L - The attacker simply transmits a beacon/probe response whose body is shorter than the 36-byte fixed management offset with a valid FCS, and can repeat it continuously or answer the victim\u0027s probe requests during the routine scans that set priv-\u003escanning, so triggering is reliable and fully attacker-timed.\nPR:N - No authentication, association, or any local privilege is required; the frame is parsed during scanning before any association or key exchange, so an entirely unauthenticated radio-range attacker reaches the bug.\nUI:N - Background and periodic scans are issued automatically by wpa_supplicant/NetworkManager without any user action, so no victim interaction is needed for the vulnerable path to run.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The underflowed length becomes ~4GB when widened to unsigned int, so the element walk reads far past the ~2.5KB RX skb slab object, and the out-of-bounds byte taken as el[2] is turned into rx_status.freq that userspace observes in scan results, allowing repeated frames to leak adjacent kernel heap contents.\nI:N - The defect is purely a read overrun; nothing outside the skb is written and the only attacker-influenced value is the reported channel/frequency, giving no memory-corruption or control-flow primitive.\nA:H - The unbounded element walk runs off the slab and can dereference unmapped memory while executing in tasklet/softirq context, producing a kernel oops or panic that the attacker can trigger repeatedly with injected frames."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      "title": "wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()",
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    "datePublished": "2026-08-10T12:03:51.663Z",
    "dateReserved": "2026-07-30T09:28:09.386Z",
    "dateUpdated": "2026-08-19T16:34:33.308Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-08-20",
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If the device\\ndelivers a truncated beacon or probe response, the oversized IE length\\ncauses an out-of-bounds read during scanning.\\n\\nSkip the IE lookup if the frame does not reach the variable elements,\\nbefore subtracting el_off.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/atmel/at76c50x-usb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"cb831aff2f850f72bc5ff5ad77d0a70bb5a84061\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"4875680d1703f56afa6257ba30244f2fb44ed205\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"b406f33d234f98c8b310fdab5cbb492d85e98e49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"e165a1d295e7e814e13b0f92c86e5d48309509ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"bcde7249d45f52f994a9872bedf45994472ade77\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"fb1b50ab699211e777dca5ccfb648788b6a6e519\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"f742d9c98b5c504fc9e6744eef13a721c2aea486\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1264b951463a00efebe1bb596499aaad620ec8af\",\"lessThan\":\"61a799ffd1e5a4fd3702d547828b7ff3d161468e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/atmel/at76c50x-usb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T03:13:20+00:00",
      "cve": "CVE-2026-68373",
      "id": "CVE-2026-68373",
      "initial_release_date": "2026-08-10T12:03:51.663000+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Out-of-bounds read in wifi driver due to length underflow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68373.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T23:44:34Z",
      "cve": "CVE-2026-68373",
      "id": "CVE-2026-68373",
      "initial_release_date": "2026-08-14T17:13:43Z",
      "product_status:known_affected": "197",
      "product_status:known_not_affected": "99",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68373",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68373.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.

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  • 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.
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