CVE-2023-53094 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: tty: serial: fsl_lpuart: fix race on RX DMA shutdown From time to time DMA completion can come in the middle of DMA shutdown: <process ctx>: <IRQ>: lpuart32_shutdown() lpuart_dma_shutdown() del_timer_sync() lpuart_dma_rx_complete() lpuart_copy_rx_to_tty() mod_timer() lpuart_dma_rx_free() When the timer fires a bit later, sport->dma_rx_desc is NULL: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004 pc : lpuart_copy_rx_to_tty+0xcc/0x5bc lr : lpuart_timer_func+0x1c/0x2c Call trace: lpuart_copy_rx_to_tty lpuart_timer_func call_timer_fn __run_timers.part.0 run_timer_softirq __do_softirq __irq_exit_rcu irq_exit handle_domain_irq gic_handle_irq call_on_irq_stack do_interrupt_handler ... To fix this fold del_timer_sync() into lpuart_dma_rx_free() after dmaengine_terminate_sync() to make sure timer will not be re-started in lpuart_copy_rx_to_tty() <= lpuart_dma_rx_complete().

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-05-03	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-05-03

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:H/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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.	1.0	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:H/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.

1.0

3.6

[email protected]

OS Trackers for CVE-2023-53094

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-53094 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-2023-53094
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-53094
`suse`	medium	CVE-2023-53094 severity moderate: SUSE including 295 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 468 product×package rows across 45 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-HPC-BYOS, … (45 product lines)): Known Affected 231, Known Not Affected 138, Fixed 99.	https://www.suse.com/security/cve/CVE-2023-53094/
`ubuntu`	medium	CVE-2023-53094 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 149, released 120, not-affected 95, needed 41, needs-triage 1.	https://ubuntu.com/security/CVE-2023-53094

Affected software / configurations for CVE-2023-53094

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 3.18.9, < 3.19	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 3.19.1, < 5.10.177	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.105	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.23	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-2023-53094

URL	Tags
https://git.kernel.org/stable/c/19a98d56dfedafb25652bdb9cd48a4e73ceba702	Patch
https://git.kernel.org/stable/c/1be6f2b15f902c02e055ae0b419ca789200473c9	Patch
https://git.kernel.org/stable/c/2a36b444cace9580380467fd1183bb5e85bcc80a	Patch
https://git.kernel.org/stable/c/90530e7214c8a04dcdde57502d93fa96af288c38	Patch
https://git.kernel.org/stable/c/954fc9931f0aabf272b5674cf468affdd88d3a36	Patch

URL

CVE-2023-53094 | tty: serial: fsl_lpuart: fix race on RX DMA shutdown

Exploit prediction scoring system (EPSS) score for CVE-2023-53094

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53094

Weakness enumeration for CVE-2023-53094

OS Trackers for CVE-2023-53094

Affected software / configurations for CVE-2023-53094

References for CVE-2023-53094