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CVE-2023-53121

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: tcp: tcp_make_synack() can be called from process context tcp_rtx_synack() now could be called in process context as explained…

Published May 2, 2025EPSS 0.19%

Overview

CVE-2023-53121 is a medium-severity vulnerability. It was published on May 2, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

tcp: tcp_make_synack() can be called from process context

tcp_rtx_synack() now could be called in process context as explained in

0a375c822497 ("tcp: tcp_rtx_synack() can be called from process

context").

tcp_rtx_synack() might call tcp_make_synack(), which will touch per-CPU

variables with preemption enabled. This causes the following BUG:

BUG: using __this_cpu_add() in preemptible [00000000] code: ThriftIO1/5464

caller is tcp_make_synack+0x841/0xac0

Call Trace:

<TASK>

dump_stack_lvl+0x10d/0x1a0

check_preemption_disabled+0x104/0x110

tcp_make_synack+0x841/0xac0

tcp_v6_send_synack+0x5c/0x450

tcp_rtx_synack+0xeb/0x1f0

inet_rtx_syn_ack+0x34/0x60

tcp_check_req+0x3af/0x9e0

tcp_rcv_state_process+0x59b/0x2030

tcp_v6_do_rcv+0x5f5/0x700

release_sock+0x3a/0xf0

tcp_sendmsg+0x33/0x40

____sys_sendmsg+0x2f2/0x490

__sys_sendmsg+0x184/0x230

do_s

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/442aa78ed70188b21ccd8669738448702c0a3281Refgit.kernel.org/stable/c/7613cde8c0c1f02a7ec2e1d536c01b65b135fc1cRefgit.kernel.org/stable/c/77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfaRefgit.kernel.org/stable/c/9180aa4622a720b433e842b4d3aa34d73eec577aRefgit.kernel.org/stable/c/ad07290d63ff6689f50565b02f5b6f34ec15a5caRefgit.kernel.org/stable/c/bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09Refgit.kernel.org/stable/c/d493d4fe88195a144d6a277a90062a7534ed2192Refgit.kernel.org/stable/c/e23ca307745be3df7fe9762f3e2a7e311a57852e

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53121?

CVE-2023-53121 is a medium-severity vulnerability. It was published on May 2, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53121?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53121?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53121?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53121 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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