CVE-2025-53057: 
OpenJDK JDK vulnerability analysis and mitigation

A use-after-free (UAF) vulnerability has been identified in the Linux kernel's network scheduler component (CVE-2024-53057). The vulnerability exists in the qdisctreereduce_backlog function where Qdiscs with major handle ffff: are incorrectly assumed to be either root or ingress. This vulnerability was discovered by Budimir Markovic and affects Linux kernel versions from 2.6.25 through 6.11.7 (NVD).

The vulnerability stems from an invalid assumption in the qdisctreereduce_backlog function where Qdiscs with major handle ffff: are assumed to be either root or ingress. This assumption is incorrect since it's valid to create egress qdiscs with major handle ffff:. For qdiscs like DRR that maintain an active class list, this can result in a use-after-free condition with a dangling class pointer. The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (High) with the vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (NVD).

The vulnerability can lead to a use-after-free condition, potentially allowing an attacker to execute arbitrary code with elevated privileges, access sensitive information, or cause system crashes. The high CVSS score of 7.8 indicates significant potential impact on the confidentiality, integrity, and availability of the affected systems (NVD).

The proper fix involves modifying the code to stop when parent TCHROOT is reached, as this is the only way to retrieve ingress when a hierarchy without a ffff: major handle calls into qdisclookup with TCHMAJ(TCH_ROOT). Multiple patches have been released to address this vulnerability across different kernel versions (Kernel.org).