What is CVE-2026-53049?

CVE-2026-53049 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, classified as a Improper Locking flaw (CWE-667), affecting Linux kernel versions from 5.7 onward and patched in 5.15.209, 6.1.175, 6.6.141 and others. CVE-2026-53049 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53049?

CVE-2026-53049 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-53049?

Yes, CVE-2026-53049 has been patched. Fixed versions include 5.15.209, 6.1.175, 6.6.141 and others. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53049 actively exploited?

CVE-2026-53049 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Improper Locking (CWE-667)?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/667.html

CVE-2026-53049

Critical

In the Linux kernel, the following vulnerability has been resolved: gfs2: add some missing log locking Function gfs2_logd() calls the log flushing functions gfs2_ail1_start(), gfs2_ail1_wait(), and gfs2_ail1_empty() without holding sdp->sd_log_flush_lock, but these functions require exclusion against concurrent transactions. To fix that, add a non-locking __gfs2_log_flush() function. Then, in gfs2_logd(), take sdp->sd_log_flush_lock before calling the above mentioned log flushing functions and __gfs2_log_flush().

Package Linux Kernel

Published 2026-06-24

Last modified 2026-07-21

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-667

CVE-2026-53049 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.7 and later are affected. Fixed in 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 and their respective stable series.

Affected from

≥ 5.7

Fixed in

✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.141 6.6.x ✓ 6.12.91 6.12.x ✓ 6.18.33 6.18.x ✓ 7.0.10 7.0.x ✓ 7.1

References

7 total

Kernel Git
https://git.kernel.org/stable/c/3b28eb75afe520972bacc833850c2b30aa0824cd

Patch
Kernel Git
https://git.kernel.org/stable/c/49d9be0722da3a4a893ba905720cba1921834ec3

Patch
Kernel Git
https://git.kernel.org/stable/c/98e8bf249c790d56de1abc4a5f8bd68035a00921

Patch
Kernel Git
https://git.kernel.org/stable/c/bf5fcd9c37c2546beaf7b401d31aefd89017dc3d

Patch
Kernel Git
https://git.kernel.org/stable/c/ca95342cb1b39062a03c115830286f0a426053d5

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2026-53049

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-06-24

Modified 2026-07-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53049?

CVE-2026-53049 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 5.7 onward and has been patched in 5.15.209, 6.1.175, 6.6.141 and others. CVE-2026-53049 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53049?

CVE-2026-53049 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-53049?

Yes. CVE-2026-53049 has been patched. Fixed versions include 5.15.209, 6.1.175, 6.6.141 and others. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53049 actively exploited?

No. CVE-2026-53049 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.