CVE-2024-50199

CVE Details

Release Date:

2024-11-08

Description

In the Linux kernel, the following vulnerability has been resolved:\nmm/swapfile: skip HugeTLB pages for unuse_vma\nI got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The\nproblem can be reproduced by the following steps:\n1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory.\n2. Swapout the above anonymous memory.\n3. run swapoff and we will get a bad pud error in kernel message:\nmm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7)\nWe can tell that pud_clear_bad is called by pud_none_or_clear_bad in\nunuse_pud_range() by ftrace. And therefore the HugeTLB pages will never\nbe freed because we lost it from page table. We can skip HugeTLB pages\nfor unuse_vma to fix it.

See more information about CVE-2024-50199 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality:	None
Integrity:	None
Availability:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12887	2024-12-18
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12887	2024-12-18