CVE-2024-53211 The advisory has been revoked - it doesn't affect any version of package kernel-kdump  (opens in a new tab)


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  • Snyk IDSNYK-CENTOS7-KERNELKDUMP-8874832
  • published28 Feb 2025
  • disclosed27 Dec 2024

Introduced: 27 Dec 2024

CVE-2024-53211  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-kdump package and not the kernel-kdump package as distributed by Centos.

In the Linux kernel, the following vulnerability has been resolved:

net/l2tp: fix warning in l2tp_exit_net found by syzbot

In l2tp's net exit handler, we check that an IDR is empty before destroying it:

WARN_ON_ONCE(!idr_is_empty(&pn->l2tp_tunnel_idr));
idr_destroy(&pn->l2tp_tunnel_idr);

By forcing memory allocation failures in idr_alloc_32, syzbot is able to provoke a condition where idr_is_empty returns false despite there being no items in the IDR. This turns out to be because the radix tree of the IDR contains only internal radix-tree nodes and it is this that causes idr_is_empty to return false. The internal nodes are cleaned by idr_destroy.

Use idr_for_each to check that the IDR is empty instead of idr_is_empty to avoid the problem.