What is CVE-2026-53365?

CVE-2026-53365 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 6.7 onward and patched in 6.12.97, 6.18.34, 7.0.11 and others. CVE-2026-53365 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53365?

CVE-2026-53365 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-2026-53365?

Yes, CVE-2026-53365 has been patched. Fixed versions include 6.12.97, 6.18.34, 7.0.11 and others. If you are running Linux kernel 6.7 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53365 actively exploited?

CVE-2026-53365 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-2026-53365

Medium

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix zerocopy completion for multi-skb sends When a large message is fragmented into multiple skbs, the zerocopy uarg is only allocated and attached to the last skb in the loop. Non-final skbs carry pinned user pages with no completion tracking, so the kernel has no way to notify userspace when those pages are safe to reuse. If the loop breaks early the uarg is never allocated at all, leaking pinned pages with no completion notification. Fix this by following the approach used by TCP: allocate the zerocopy uarg (if not provided by the caller) before the send loop and attach it to every skb via skb_zcopy_set(), which takes a reference per skb. Each skb's completion properly decrements the refcount, and the notification only fires after the last skb is freed. On failure, if no data was sent, the uarg is cleanly aborted via net_zcopy_put_abort(). This issue was initially discovered by sashiko while reviewing commit 1cb36e252211 ("vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting") but was pre-existing.

Package Linux Kernel

Published 2026-07-13

Last modified 2026-08-18

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-2026-53365 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 6.7 and later are affected. Fixed in 6.12.97, 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 6.7

Fixed in

✓ 6.12.97 6.12.x ✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

5 total

Kernel Git
https://git.kernel.org/stable/c/76b995bc57bd90cb6e954e1966fbd8786da47f0d

Patch
Kernel Git
https://git.kernel.org/stable/c/ae38d9179190a956e2a87a69ef1dd6f451b51c4d

Patch
Kernel Git
https://git.kernel.org/stable/c/b3155f2b78db21e99256bcf7eb902f24ff6d5338

Patch
Kernel Git
https://git.kernel.org/stable/c/293fe8f2d1b5ac464ca16a8eba09571bbbb34ba9
GitHub
https://github.com/MaherAzzouzi/vsockdrop

Details

CVE ID CVE-2026-53365

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-07-13

Modified 2026-08-18

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53365?

CVE-2026-53365 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 6.7 onward and has been patched in 6.12.97, 6.18.34, 7.0.11 and others. CVE-2026-53365 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53365?

CVE-2026-53365 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-2026-53365?

Yes. CVE-2026-53365 has been patched. Fixed versions include 6.12.97, 6.18.34, 7.0.11 and others. If you are running Linux kernel 6.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53365 actively exploited?

No. CVE-2026-53365 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.