CVE-2026-53182
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile — higher than 4% of all known CVEs
Summary
In the Linux kernel, a vulnerability was found in nl80211_parse_rnr_elems() where the element count is stored in an 8-bit field of the cfg80211_rnr_elems structure. Lack of proper validation before incrementing the counter may lead to buffer overflow when processing oversized EMA RNR lists.
Risk Assessment
An attacker can send a crafted request with an excessive number of RNR elements, potentially causing a buffer overflow that could lead to system integrity compromise or denial of service.
Recommendation
Immediately update the Linux kernel to a version containing the fix that rejects EMA RNR lists once the count reaches 255 elements.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: reject oversized EMA RNR lists nl80211_parse_rnr_elems() stores the parsed element count in a u8-backed cfg80211_rnr_elems::cnt field and uses that count to size the flexible array allocation. Reject nested NL80211_ATTR_EMA_RNR_ELEMS input once the count reaches 255, before incrementing it again. This keeps the parser aligned with the data structure it fills and matches the existing bound check used by nl80211_parse_mbssid_elems().