What is CVE-2023-52767?

CVE-2023-52767 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 6.5 onward and patched in 6.6.4 and 6.7. CVE-2023-52767 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-52767?

CVE-2023-52767 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-2023-52767?

Yes, CVE-2023-52767 has been patched. Fixed versions include 6.6.4 and 6.7. If you are running Linux kernel 6.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-52767 actively exploited?

CVE-2023-52767 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2023-52767

Medium

In the Linux kernel, the following vulnerability has been resolved: tls: fix NULL deref on tls_sw_splice_eof() with empty record syzkaller discovered that if tls_sw_splice_eof() is executed as part of sendfile() when the plaintext/ciphertext sk_msg are empty, the send path gets confused because the empty ciphertext buffer does not have enough space for the encryption overhead. This causes tls_push_record() to go on the `split = true` path (which is only supposed to be used when interacting with an attached BPF program), and then get further confused and hit the tls_merge_open_record() path, which then assumes that there must be at least one populated buffer element, leading to a NULL deref. It is possible to have empty plaintext/ciphertext buffers if we previously bailed from tls_sw_sendmsg_locked() via the tls_trim_both_msgs() path. tls_sw_push_pending_record() already handles this case correctly; let's do the same check in tls_sw_splice_eof().

Package Linux Kernel

Published 2024-05-21

Last modified 2025-01-06

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-476

CVE-2023-52767 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.5 and later are affected. Fixed in 6.6.4, 6.7 and their respective stable series.

Affected from

≥ 6.5

Fixed in

✓ 6.6.4 6.6.x ✓ 6.7

References

3 total

Kernel Git
https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8

Patch
Kernel Git
https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0

Patch
Kernel Git
https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9

Patch

Details

CVE ID CVE-2023-52767

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-01-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-52767?

CVE-2023-52767 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 6.5 onward and has been patched in 6.6.4 and 6.7. CVE-2023-52767 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-52767?

CVE-2023-52767 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-2023-52767?

Yes. CVE-2023-52767 has been patched. Fixed versions include 6.6.4 and 6.7. If you are running Linux kernel 6.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-52767 actively exploited?

No. CVE-2023-52767 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.