CVE-2026-63869

CVE CVE-2026-63869EUVD EUVD-2026-45554Published 2026-07-19T14:18:38.000ZLast changed 2026-08-05T12:36:44.000ZCVSS 7.6

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap When parsing the radiotap header of an injected frame, ieee80211_parse_tx_radiotap() uses the IEEE80211_RADIOTAP_ANTENNA value directly as a shift count: info->control.antennas |= BIT(*iterator.this_arg); *iterator.this_arg is an 8-bit value taken straight from the frame supplied by userspace, so BIT() can be asked to shift by up to 255. That is undefined behaviour on the unsigned long and is reported by UBSAN: UBSAN: shift-out-of-bounds in net/mac80211/tx.c:2174:30 shift exponent 235 is too large for 64-bit type 'unsigned long' Call Trace: ieee80211_parse_tx_radiotap+0xadb/0x1950 net/mac80211/tx.c:2174 ieee80211_monitor_start_xmit+0xb1f/0x1250 net/mac80211/tx.c:2451 ... packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3109 info->control.antennas is a 2-bit bitmap (u8 antennas:2), so only antenna indices 0 and 1 can ever be represented. Ignore any larger value instead of shifting out of bounds.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux ef246a1480cc484cd2aeda75737cb0848616ddf3 <033ce021a220913ac02416fcb5ac883a9ff8b6c7; patch: 6.18.36; 6.7; ef246a1480cc484cd2aeda75737cb0848616ddf3 <f6d3dc8e8492bf8435e0b23c99472af7bafd6b44; patch: 7.0.13; patch: 7.1; patch: 6.12.94; ef246a1480cc484cd2aeda75737cb0848616ddf3 <9b40c59bab08f2a99abf969cc0bb92fa49de004b; patch: 0; ef246a1480cc484cd2aeda75737cb0848616ddf3 <6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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