CVE-2024-50199

MEDIUM EPSS 12.8%
Published Nov 8, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Nov 8, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: skip HugeTLB pages for unuse_vma I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
12.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥2.6.36  –  <5.4.285
linuxlinux_kernel*≥5.5  –  <5.10.228
linuxlinux_kernel*≥5.11  –  <5.15.169
linuxlinux_kernel*≥5.16  –  <6.1.114
linuxlinux_kernel*≥6.2  –  <6.6.58
linuxlinux_kernel*≥6.7  –  <6.11.5
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any

References 9

  • git.kernel.org https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
    Patch