What is CVE-2021-47119?

CVE-2021-47119 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 2.6.19 onward and patched in 5.10.43, 5.12.10 and 5.13. CVE-2021-47119 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47119?

CVE-2021-47119 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47119?

Yes, CVE-2021-47119 has been patched. Fixed versions include 5.10.43, 5.12.10 and 5.13. If you are running Linux kernel 2.6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47119 actively exploited?

CVE-2021-47119 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2021-47119

Medium

In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_fill_super Buffer head references must be released before calling kill_bdev(); otherwise the buffer head (and its page referenced by b_data) will not be freed by kill_bdev, and subsequently that bh will be leaked. If blocksizes differ, sb_set_blocksize() will kill current buffers and page cache by using kill_bdev(). And then super block will be reread again but using correct blocksize this time. sb_set_blocksize() didn't fully free superblock page and buffer head, and being busy, they were not freed and instead leaked. This can easily be reproduced by calling an infinite loop of: systemctl start <ext4_on_lvm>.mount, and systemctl stop <ext4_on_lvm>.mount ... since systemd creates a cgroup for each slice which it mounts, and the bh leak get amplified by a dying memory cgroup that also never gets freed, and memory consumption is much more easily noticed.

Package Linux Kernel

Published 2024-03-15

Last modified 2025-01-07

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-401

CVE-2021-47119 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.19 and later are affected. Fixed in 5.10.43, 5.12.10, 5.13 and their respective stable series.

Affected from

≥ 2.6.19

Fixed in

✓ 5.10.43 5.10.x ✓ 5.12.10 5.12.x ✓ 5.13

References

3 total

Kernel Git
https://git.kernel.org/stable/c/01d349a481f0591230300a9171330136f9159bcd

Patch
Kernel Git
https://git.kernel.org/stable/c/1385b23396d511d5233b8b921ac3058b3f86a5e1

Patch
Kernel Git
https://git.kernel.org/stable/c/afd09b617db3786b6ef3dc43e28fe728cfea84df

Patch

Details

CVE ID CVE-2021-47119

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-15

Modified 2025-01-07

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47119?

CVE-2021-47119 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 2.6.19 onward and has been patched in 5.10.43, 5.12.10 and 5.13. CVE-2021-47119 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47119?

CVE-2021-47119 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47119?

Yes. CVE-2021-47119 has been patched. Fixed versions include 5.10.43, 5.12.10 and 5.13. If you are running Linux kernel 2.6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47119 actively exploited?

No. CVE-2021-47119 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.