What’s Vulnerable › Vulnerabilities

CVE-2021-47116: ext4: fix memory leak in ext4_mb_init_backend on error path.

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-15 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_mb_init_backend on error path. Fix a memory leak discovered by syzbot when a file system is corrupted with an illegally large s_log_groups_per_flex.

Affected products

• Linux kernel: before 5.10.43; from 5.11 before 5.12.10; 5.13-rc1, 5.13-rc2, 5.13-rc3, 5.13-rc4 — fixed in 5.10.43, 5.12.10

How to fix

Upgrade to a fixed version: Linux kernel 5.10.43, 5.12.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0
• https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49
• https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5
• https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0
• https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49
• https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5

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