In the Linux kernel, the following vulnerability has been resolved: batman-adv: gw: acquire ethernet header only after skb realloc The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free.
Casky was already ahead
This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-80601 is a use-after-free vulnerability in the Linux kernel's batman-adv (Better Approach to Mobile Ad-hoc Networking) module, specifically in gateway packet handling. The flaw occurs when pskb_may_pull() reallocates the socket buffer (skb) during VLAN ID extraction, but pointer variables referencing the old buffer location are not updated, leading to stale pointer dereferences. This affects systems running batman-adv—commonly used in mesh networking and ad-hoc deployments—and could allow local attackers to read kernel memory or trigger denial of service through corrupted packet processing.
While this CVE does not currently map to specific MITRE ATT&CK techniques or have Casky skills directly aligned, practitioners using Casky's 754 security skills with Claude AI's extended reasoning can detect attack patterns related to T1499 (Service Exhaustion Denial of Service) and T1222 (File and Directory Permissions Modification) by analyzing kernel panic signatures, memory access violations, and unexpected process terminations in batman-adv traffic flows. Detection would manifest as abnormal packet sequences triggering kernel memory exceptions, segmentation faults in the batman module, or suspicious gateway election messages that cause buffer reallocation events—indicators that should trigger investigation into potential exploitation attempts targeting the skb reallocation code path.
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