Updated: 2026-03-05 02:51:02.542996
Description:
An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | MEDIUM | 5.6 |
| CVSS Version 3.x | HIGH | 7.1 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| CentOS 6 ELS | kernel | 2.6.32 | 7.1 | HIGH | Not Vulnerable | 2022-01-21 11:19:39 | Not affected: CVE-2021-3506 is limited to the F2FS filesystem code path (fs/f2fs/node.c) and is only... | |
| CentOS 7 ELS | kernel | 3.10.0 | 7.1 | HIGH | Not Vulnerable | 2023-11-02 09:35:40 | Not affected: CVE-2021-3506 targets the F2FS filesystem code path in fs/f2fs/node.c. On the referenc... | |
| CentOS 8.4 ELS | kernel | 4.18.0 | 7.1 | HIGH | Released | CLSA-2022:1651145959 | 2022-04-28 15:59:42 | |
| CentOS 8.5 ELS | kernel | 4.18.0 | 7.1 | HIGH | Not Vulnerable | 2025-10-24 07:19:02 | Not affected: this vulnerability is confined to the F2FS filesystem code path, which requires F2FS s... | |
| CloudLinux 6 ELS | kernel | 2.6.32 | 7.1 | HIGH | Not Vulnerable | 2022-03-30 18:50:57 | ||
| Oracle Linux 6 ELS | kernel | 2.6.32 | 7.1 | HIGH | Not Vulnerable | 2022-03-30 18:50:57 | Not affected: CVE-2021-3506 is limited to the F2FS filesystem code path (fs/f2fs/node.c) and is only... | |
| Ubuntu 16.04 ELS | linux-hwe | 4.15.0 | 7.1 | HIGH | Released | CLSA-2022:1664906081 | 2022-10-04 14:02:46 | |
| Ubuntu 16.04 ELS | linux | 4.4.0 | 7.1 | HIGH | Already Fixed | CLSA-2022:1649869212 | 2025-10-24 09:05:54 | |
| Ubuntu 18.04 ELS | linux | 4.15.0 | 7.1 | HIGH | Already Fixed | 2023-06-02 09:10:33 |