PT-2024-11108 · Linux · Linux Kernel

Published 2021-03-26 · Updated 2025-01-08 · CVE-2021-47004

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to the f2fs file system in the Linux kernel. In CP disabling mode, there are two issues when using LFS or SSR | AT SSR mode to select a victim. The first issue is that LFS is set to find the source section during GC, and the victim should have no checkpointed data. However, previously, only valid checkpointed blocks in the current segment were checked, rather than the section. The second issue is that SSR | AT SSR are set to find the target segment for writes, which can be fully filled by checkpointed and newly written blocks. This can cause panic or data corruption during allocation if the segment is selected via the {AT,}SSR allocator and there is no free space in the target segment.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2025-05319

CVE-2021-47004

Affected Products

Linux Kernel

References · 22

• https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47004 · Vendor Advisory
• https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 · Patch
• https://osv.dev/vulnerability/CVE-2021-47004 · Vendor Advisory
• https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db · Patch
• https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47004 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47004 · Security Note
• https://bdu.fstec.ru/vul/2025-05319 · Security Note
• https://ubuntu.com/security/CVE-2021-47004 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47004 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47004 · Vendor Advisory
• https://lore.kernel.org/linux-cve-announce/2024022829-CVE-2021-47004-8544@gregkh · Note
• https://git.linuxtesting.ru/pub/scm/linux/kernel/git/lvc/linux-stable.git/commit/?h=v5.10.176-lvc1&id=105155a8146ddb54c119d8318964eef3859d109d · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5 · Note