What is CVE-2023-53493?

CVE-2023-53493 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.4 onward and patched in 6.4.7 and 6.5. CVE-2023-53493 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-53493?

CVE-2023-53493 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2023-53493?

Yes, CVE-2023-53493 has been patched. Fixed versions include 6.4.7 and 6.5. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-53493 actively exploited?

CVE-2023-53493 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-53493

High

In the Linux kernel, the following vulnerability has been resolved: accel/qaic: tighten bounds checking in decode_message() Copy the bounds checking from encode_message() to decode_message(). This patch addresses the following concerns. Ensure that there is enough space for at least one header so that we don't have a negative size later. if (msg_hdr_len < sizeof(*trans_hdr)) Ensure that we have enough space to read the next header from the msg->data. if (msg_len > msg_hdr_len - sizeof(*trans_hdr)) return -EINVAL; Check that the trans_hdr->len is not below the minimum size: if (hdr_len < sizeof(*trans_hdr)) This minimum check ensures that we don't corrupt memory in decode_passthrough() when we do. memcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr)); And finally, use size_add() to prevent an integer overflow: if (size_add(msg_len, hdr_len) > msg_hdr_len)

Package Linux Kernel

Published 2025-10-01

Last modified 2026-01-16

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.4 and later are affected. Fixed in 6.4.7, 6.5 and their respective stable series.

Affected from

≥ 6.4

Fixed in

✓ 6.4.7 6.4.x ✓ 6.5

References

The following references provide additional information about CVE-2023-53493 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/51b56382ed2a2b03347372272362b3baa623ed1e
Patch
Kernel patch commit
https://git.kernel.org/stable/c/57d14cb3bae4619ce2fb5235cb318c3d5d8f53fd
Patch

Details

CVE ID CVE-2023-53493

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-10-01

Modified 2026-01-16

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-53493?

CVE-2023-53493 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 6.4 onward and has been patched in 6.4.7 and 6.5. CVE-2023-53493 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-53493?

CVE-2023-53493 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2023-53493?

Yes — CVE-2023-53493 has been patched. Fixed versions include 6.4.7 and 6.5. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-53493 actively exploited?

No — CVE-2023-53493 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.