What is CVE-2023-53511?

CVE-2023-53511 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 5.17.9 onward and patched in 6.1.16, 6.2.3 and 6.3. CVE-2023-53511 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-53511?

CVE-2023-53511 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-2023-53511?

Yes, CVE-2023-53511 has been patched. Fixed versions include 6.1.16, 6.2.3 and 6.3. If you are running Linux kernel 5.17.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-53511 actively exploited?

CVE-2023-53511 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-2023-53511

Medium

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix fget leak when fs don't support nowait buffered read Heming reported a BUG when using io_uring doing link-cp on ocfs2. [1] Do the following steps can reproduce this BUG: mount -t ocfs2 /dev/vdc /mnt/ocfs2 cp testfile /mnt/ocfs2/ ./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1 umount /mnt/ocfs2 Then umount will fail, and it outputs: umount: /mnt/ocfs2: target is busy. While tracing umount, it blames mnt_get_count() not return as expected. Do a deep investigation for fget()/fput() on related code flow, I've finally found that fget() leaks since ocfs2 doesn't support nowait buffered read. io_issue_sqe |-io_assign_file // do fget() first |-io_read |-io_iter_do_read |-ocfs2_file_read_iter // return -EOPNOTSUPP |-kiocb_done |-io_rw_done |-__io_complete_rw_common // set REQ_F_REISSUE |-io_resubmit_prep |-io_req_prep_async // override req->file, leak happens This was introduced by commit a196c78b5443 in v5.18. Fix it by don't re-assign req->file if it has already been assigned. [1] https://lore.kernel.org/ocfs2-devel/[email protected]/T/#t

Package Linux Kernel

Published 2025-10-01

Last modified 2026-04-06

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-2023-53511 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 5.17.9, 5.18 and later are affected. Fixed in 6.1.16, 6.2.3, 6.3 and their respective stable series.

Affected from

≥ 5.17.9 ≥ 5.18

Fixed in

✓ 6.1.16 6.1.x ✓ 6.2.3 6.2.x ✓ 6.3

References

3 total

Kernel Git
https://git.kernel.org/stable/c/10fb2e16ee6ffaf1716b9e90d007e6b300bfa457

Patch
Kernel Git
https://git.kernel.org/stable/c/54aa7f2330b82884f4a1afce0220add6e8312f8b

Patch
Kernel Git
https://git.kernel.org/stable/c/75a499fc9d66a32271e2b3e4ca71156e8ad3b484

Patch

Details

CVE ID CVE-2023-53511

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-10-01

Modified 2026-04-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-53511?

CVE-2023-53511 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 5.17.9 onward and has been patched in 6.1.16, 6.2.3 and 6.3. CVE-2023-53511 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-53511?

CVE-2023-53511 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-2023-53511?

Yes. CVE-2023-53511 has been patched. Fixed versions include 6.1.16, 6.2.3 and 6.3. If you are running Linux kernel 5.17.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-53511 actively exploited?

No. CVE-2023-53511 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.