CVE-2026-23367: 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->nextnsdata 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->nextnsdata only for vendor namespaces, even in case undefined fields are present.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.130.1-1 - Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.113-1Fixed in 7.2.12-1Fixed in 7.2.13-1 - Configuration
Move rejection of unknown radiotap fields to after the in-namespace lookup, so iterator->_next_ns_data is used only for vendor namespaces and undefined fields such as field 18 are rejected safely.
Linux kernel radiotap parser rejection of unknown radiotap fields = reject before using unknown field alignment/size
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23367?
CVE-2026-23367 is classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2026-23367?
To fix CVE-2026-23367, upgrade to the latest version of the Linux kernel that includes the patch for this vulnerability.
What type of vulnerability is CVE-2026-23367?
CVE-2026-23367 is a denial-of-service vulnerability related to the radiotap parser in the Linux kernel.
Who is affected by CVE-2026-23367?
CVE-2026-23367 affects users of the Linux kernel that utilize the radiotap parser for wireless communication.
What does CVE-2026-23367 specifically address?
CVE-2026-23367 addresses the handling of radiotap packets with unknown bits, which could lead to potential denial-of-service conditions.