CVE-2023-53110 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler() When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups. This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create(). smc_smcr_terminate_all smc_buf_create /* init */ conn->sndbuf_desc = NULL; ... __smc_lgr_terminate smc_conn_kill smc_close_abort smc_cdc_get_slot_and_msg_send __softirqentry_text_start smc_wr_tx_process_cqe smc_cdc_tx_handler READ(conn->sndbuf_desc->len); /* panic dues to NULL sndbuf_desc */ conn->sndbuf_desc = xxx; This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-26	0.02%	0.06%	+0.04%
2	2025-05-03	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-26

0.02%

0.06%

+0.04%

2025-05-03

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

OS Trackers for CVE-2023-53110

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-53110 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2023-53110
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-53110
`suse`	medium	CVE-2023-53110 severity moderate: SUSE including 74 source package names (bpftool-4.18.0-513.5.1.el8_9, bpftool-7.2.0-362.8.1.el9_3, …), 228 product×package rows across 35 product lines (SUSE Liberty Linux 8, SUSE Liberty Linux 9, … (35 product lines)): Known Not Affected 179, Fixed 49.	https://www.suse.com/security/cve/CVE-2023-53110/
`ubuntu`	medium	CVE-2023-53110 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, ignored 146, not-affected 139, released 120, needs-triage 1.	https://ubuntu.com/security/CVE-2023-53110

Affected software / configurations for CVE-2023-53110

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.5, < 5.10.176	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.104	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.21	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.2.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.3	cpe:2.3:o:linux:linux_kernel:6.3:rc1::::::
linux	linux_kernel	6.3	cpe:2.3:o:linux:linux_kernel:6.3:rc2::::::

References for CVE-2023-53110

URL	Tags
https://git.kernel.org/stable/c/22a825c541d775c1dbe7b2402786025acad6727b	Patch
https://git.kernel.org/stable/c/31817c530768b0199771ec6019571b4f0ddbf230	Patch
https://git.kernel.org/stable/c/3c270435db8aa34929263dddae8fd050f5216ecb	Patch
https://git.kernel.org/stable/c/3ebac7cf0a184a8102821a7a00203f02bebda83c	Patch
https://git.kernel.org/stable/c/b108bd9e6be000492ebebe867daa699285978a10	Patch

URL

CVE-2023-53110 | net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

Exploit prediction scoring system (EPSS) score for CVE-2023-53110

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53110

Weakness enumeration for CVE-2023-53110

OS Trackers for CVE-2023-53110

Affected software / configurations for CVE-2023-53110

References for CVE-2023-53110