CVE-2026-68373High· 8.1▾ TwilightIn 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) befor…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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.
Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < cb831aff2f850f72bc5ff5ad77d0a70bb5a84061Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < 4875680d1703f56afa6257ba30244f2fb44ed205Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < b406f33d234f98c8b310fdab5cbb492d85e98e49Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < e165a1d295e7e814e13b0f92c86e5d48309509ceLinux >= 1264b951463a00efebe1bb596499aaad620ec8af < bcde7249d45f52f994a9872bedf45994472ade77Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < fb1b50ab699211e777dca5ccfb648788b6a6e519Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < f742d9c98b5c504fc9e6744eef13a721c2aea486Linux >= 1264b951463a00efebe1bb596499aaad620ec8af < 61a799ffd1e5a4fd3702d547828b7ff3d161468eLinux 2.6.30Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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