{"id":"CVE-2026-68373","title":"wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()","summary":"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) befor…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < cb831aff2f850f72bc5ff5ad77d0a70bb5a84061","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < 4875680d1703f56afa6257ba30244f2fb44ed205","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < b406f33d234f98c8b310fdab5cbb492d85e98e49","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < e165a1d295e7e814e13b0f92c86e5d48309509ce","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < bcde7249d45f52f994a9872bedf45994472ade77","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < fb1b50ab699211e777dca5ccfb648788b6a6e519","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < f742d9c98b5c504fc9e6744eef13a721c2aea486","Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < 61a799ffd1e5a4fd3702d547828b7ff3d161468e","Linux 2.6.30"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:47:30.765621Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:09.657Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68373","references":[{"url":"https://git.kernel.org/stable/c/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061"},{"url":"https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205"},{"url":"https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49"},{"url":"https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce"},{"url":"https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77"},{"url":"https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519"},{"url":"https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486"},{"url":"https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e"}],"tags":["cve.org"],"epss":0.00274,"epssPercentile":0.18487,"ingestedAt":"2026-10-16T17:24:46.861Z","slug":"CVE-2026-68373","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < cb831aff2f850f72bc5ff5ad77d0a70bb5a84061`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < 4875680d1703f56afa6257ba30244f2fb44ed205`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < b406f33d234f98c8b310fdab5cbb492d85e98e49`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < e165a1d295e7e814e13b0f92c86e5d48309509ce`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < bcde7249d45f52f994a9872bedf45994472ade77`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < fb1b50ab699211e777dca5ccfb648788b6a6e519`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < f742d9c98b5c504fc9e6744eef13a721c2aea486`\n- `Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < 61a799ffd1e5a4fd3702d547828b7ff3d161468e`\n- `Linux 2.6.30`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}