What is CVE-2023-53720?

CVE-2023-53720 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.3 onward and patched in 6.3.2 and 6.4. CVE-2023-53720 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-53720?

CVE-2023-53720 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2023-53720?

Yes, CVE-2023-53720 has been patched. Fixed versions include 6.3.2 and 6.4. If you are running Linux kernel 6.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-53720 actively exploited?

CVE-2023-53720 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-53720

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Release the label when replacing existing ct entry Cited commit doesn't release the label mapping when replacing existing ct entry which leads to following memleak report: unreferenced object 0xffff8881854cf280 (size 96): comm "kworker/u48:74", pid 23093, jiffies 4296664564 (age 175.944s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000002722d368>] __kmalloc+0x4b/0x1c0 [<00000000cc44e18f>] mapping_add+0x6e8/0xc90 [mlx5_core] [<000000003ad942a7>] mlx5_get_label_mapping+0x66/0xe0 [mlx5_core] [<00000000266308ac>] mlx5_tc_ct_entry_create_mod_hdr+0x1c4/0xf50 [mlx5_core] [<000000009a768b4f>] mlx5_tc_ct_entry_add_rule+0x16f/0xaf0 [mlx5_core] [<00000000a178f3e5>] mlx5_tc_ct_block_flow_offload_add+0x10cb/0x1f90 [mlx5_core] [<000000007b46c496>] mlx5_tc_ct_block_flow_offload+0x14a/0x630 [mlx5_core] [<00000000a9a18ac5>] nf_flow_offload_tuple+0x1a3/0x390 [nf_flow_table] [<00000000d0881951>] flow_offload_work_handler+0x257/0xd30 [nf_flow_table] [<000000009e4935a4>] process_one_work+0x7c2/0x13e0 [<00000000f5cd36a7>] worker_thread+0x59d/0xec0 [<00000000baed1daf>] kthread+0x28f/0x330 [<0000000063d282a4>] ret_from_fork+0x1f/0x30 Fix the issue by correctly releasing the label mapping.

Package Linux Kernel

Published 2025-10-22

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 6.3 and later are affected. Fixed in 6.3.2, 6.4 and their respective stable series.

Affected from

≥ 6.3

Fixed in

✓ 6.3.2 6.3.x ✓ 6.4

References

The following references provide additional information about CVE-2023-53720 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/3db903a71f1f4bbf30baae166a4a49f2e8aceb61
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8ac04a28144cfa89b61be518268233742c23d88d
Patch

Frequently asked questions

What is CVE-2023-53720?

CVE-2023-53720 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.3 onward and has been patched in 6.3.2 and 6.4. CVE-2023-53720 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2023-53720?

Yes — CVE-2023-53720 has been patched. Fixed versions include 6.3.2 and 6.4. If you are running Linux kernel 6.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-53720 actively exploited?

No — CVE-2023-53720 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.