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.
References
Configurations
Configuration 1 (hide)
|
History
26 Oct 2026, 16:42
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-1284 | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/033ce021a220913ac02416fcb5ac883a9ff8b6c7 - Patch | |
| References | () https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663 - Patch | |
| References | () https://git.kernel.org/stable/c/9b40c59bab08f2a99abf969cc0bb92fa49de004b - Patch | |
| References | () https://git.kernel.org/stable/c/f6d3dc8e8492bf8435e0b23c99472af7bafd6b44 - Patch |
19 Oct 2026, 21:17
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-190 |
Information
Published : 2026-07-19 15:16
Updated : 2026-10-26 16:42
NVD link : CVE-2026-63869
Mitre link : CVE-2026-63869
CVE.ORG link : CVE-2026-63869
JSON object : View
Products Affected
linux
- linux_kernel