CVE-2026-98287

A flaw was found in the Linux kernel's Point-to-Point Protocol over ATM (PPPoATM) subsystem. This vulnerability allows a local attacker to cause a Denial of Service (DoS) or memory corruption by transmitting network packets across bridged Point-to-Point Protocol (PPP) channels. The issue occurs because the driver fails to ensure that packet buffer headers are writable before encapsulation, which can lead to an unexpected system crash.

This vulnerability is rated as Moderate severity because exploitation is restricted to local attackers who can interact with bridged PPP network interfaces and requires the PPPoATM subsystem, which is not used in default Red Hat environments. While successful exploitation can cause memory corruption or a kernel panic, the attack cannot be conducted remotely across standard network interfaces. Consequently, typical enterprise installations that do not explicitly configure ATM bridging remain unaffected in standard operational workflows.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.