CVE-2023-53121 Affecting kernel-debug package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.02% (6th percentile)

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  • Snyk IDSNYK-RHEL6-KERNELDEBUG-10050572
  • published6 May 2025
  • disclosed2 May 2025

Introduced: 2 May 2025

NewCVE-2023-53121  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:6 kernel-debug.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL. See How to fix? for RHEL:6 relevant fixed versions and status.

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_syscall_64+0x3d/0x90

Avoid calling __TCP_INC_STATS() with will touch per-cpu variables. Use TCP_INC_STATS() which is safe to be called from context switch.

CVSS Base Scores

version 3.1