CVE-2026-68373 (GCVE-0-2026-68373)
Vulnerability from cvelistv5
Published
2026-08-10 12:03
Modified
2026-10-19 21:09
Severity ?
8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
Version: 1264b951463a00efebe1bb596499aaad620ec8af
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.30\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:34:33.308Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68373\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:06.316Z\", \"dateReserved\": \"2026-07-30T09:28:09.386Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:03:51.663Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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