Linux Kernel: Radiotap Parser Uninitialized Field Vulnerability
CVE-2026-23367 Published on March 25, 2026
wifi: radiotap: reject radiotap with unknown bits
In the Linux kernel, the following vulnerability has been resolved:
wifi: radiotap: reject radiotap with unknown bits
The radiotap parser is currently only used with the radiotap
namespace (not with vendor namespaces), but if the undefined
field 18 is used, the alignment/size is unknown as well. In
this case, iterator->_next_ns_data isn't initialized (it's
only set for skipping vendor namespaces), and syzbot points
out that we later compare against this uninitialized value.
Fix this by moving the rejection of unknown radiotap fields
down to after the in-namespace lookup, so it will really use
iterator->_next_ns_data only for vendor namespaces, even in
case undefined fields are present.
Products Associated with CVE-2026-23367
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Affected Versions
Linux:- Version 33e5a2f776e331dc8a4379b6efb660d38f182d96 and below 703fa979badbba83d31cd011606d060bfb8b0d1d is affected.
- Version 33e5a2f776e331dc8a4379b6efb660d38f182d96 and below 129c8bb320a7cef692c78056ef8e89a2a12ba448 is affected.
- Version 33e5a2f776e331dc8a4379b6efb660d38f182d96 and below 2a60c588d5d39ad187628f58395c776a97fd4323 is affected.
- Version 33e5a2f776e331dc8a4379b6efb660d38f182d96 and below 2f8ceeba670610d66f77def32011f48de951d781 is affected.
- Version 33e5a2f776e331dc8a4379b6efb660d38f182d96 and below e664971759a0e5570b50c6592e58a7f97d55e992 is affected.
- Version 33e5a2f776e331dc8a4379b6efb660d38f182d96 and below c854758abe0b8d86f9c43dc060ff56a0ee5b31e0 is affected.
- Version 2.6.34 is affected.
- Before 2.6.34 is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.77, <= 6.12.* is unaffected.
- Version 6.18.17, <= 6.18.* is unaffected.
- Version 6.19.7, <= 6.19.* is unaffected.
- Version 7.0-rc2, <= * is unaffected.