{"id":"CVE-2026-68373","summary":"wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()","details":"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.","modified":"2026-08-21T03:30:13.017751466Z","published":"2026-08-10T12:03:51.663Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68373.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205"},{"type":"WEB","url":"https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68373.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68373"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1264b951463a00efebe1bb596499aaad620ec8af"},{"fixed":"cb831aff2f850f72bc5ff5ad77d0a70bb5a84061"},{"fixed":"4875680d1703f56afa6257ba30244f2fb44ed205"},{"fixed":"b406f33d234f98c8b310fdab5cbb492d85e98e49"},{"fixed":"e165a1d295e7e814e13b0f92c86e5d48309509ce"},{"fixed":"bcde7249d45f52f994a9872bedf45994472ade77"},{"fixed":"fb1b50ab699211e777dca5ccfb648788b6a6e519"},{"fixed":"f742d9c98b5c504fc9e6744eef13a721c2aea486"},{"fixed":"61a799ffd1e5a4fd3702d547828b7ff3d161468e"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68373.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.30"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68373.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}