In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.

A flaw was found in the `batman-adv` `tp_meter` module of the Linux kernel. A remote attacker could exploit this vulnerability by sending a specially crafted acknowledgment (ACK) packet to a node configured as a receiver in an ongoing `tp_meter` session. This could lead to the use of uninitialized sender variables, resulting in undefined behavior and potentially a denial of service.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-52931 https://nvd.nist.gov/vuln/detail/CVE-2026-52931 https://lore.kernel.org/linux-cve-announce/2026062432-CVE-2026-52931-f85c@gregkh/T