CVE-2026-72226
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
In the Linux kernel's batman-adv module, the number of VLANs in a TT unicast TVLV is of type u16 and is multiplied by the size of struct batadv_tvlv_tt_vlan_data (8 bytes). This can overflow the u16, invalidating all additional safety checks and potentially leading to an out-of-bounds read.
Risk Assessment
The vulnerability could allow an attacker to read data outside the buffer, potentially leading to information disclosure or system crash.
Recommendation
Apply the Linux kernel patch that uses size_t for tt_vlan_len to prevent overflow. Regularly update the system.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: prevent TVLV OOB check overflow A TT unicast TVLV contains the number of VLANs stored in it. This number is an u16 and gets multiplied by the size of the struct batadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16 used to store the tt_vlan_len. All additional safety checks to prevent out-of-bounds access of the TVLV buffer are invalid due to this overflow. Using size_t prevents this overflow and ensures that the safety checks compare against the actual buffer requirements.