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CVE-2021-47116

ext4: fix memory leak in ext4_mb_init_backend on error path.

MEDIUM
5.5
CVSS Score
Published: March 15, 2024 at 08:14 PM UTC
Updated: June 17, 2026 at 04:16 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
v ≥ 5.11.11v < 5.10.435.10.27 ≤ v < 5.10.435.11 ≤ v < 5.12.105.11.11 ≤ v < 5.125.12 ≤ v < 5.12.105.12 ≤ v < 5.135.10.275.11.115.13 rc15.13 rc25.13 rc35.13 rc49e7af67e9521fb5cbb5b01aca22921c313c2e48edf61d3cff422433527d3bc388f69484f0781d226f91436d55a279f045987e8b8c1385585dca54be9
Vendor states this is fixed in 04fb2baa0b147f51db065a1b13a11954abe592d0 (fixed)
Vendor states this is fixed in 2050c6e5b161e5e25ce3c420fef58b24fa388a49 (fixed)
Vendor states this is fixed in a8867f4e3809050571c98de7a2d465aff5e4daf5 (fixed)
Vendor states this is fixed in 5.10.43 (unaffected)
Vendor states this is fixed in 5.12 (unaffected)
Vendor states this is fixed in 5.12.10 (unaffected)
Vendor states this is fixed in 5.13 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-401

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