5.5

CVE-2023-52456: serial: imx: fix tx statemachine deadlock

Modified
AliasesUBUNTU-CVE-2023-52456DEBIAN-CVE-2023-52456
Published 23-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2023-52456 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 20
DLA-3841-1OPENSUSE-SU-2024:13767-1OPENSUSE-SU-2025:14705-1SUSE-SU-2024:0855-1SUSE-SU-2024:0858-1SUSE-SU-2024:0900-1

Timeline

  1. 23-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: serial: imx: fix tx statemachine deadlock When using the serial port as RS485 port, the tx statemachine is used to control the RTS pin to drive the RS485 transceiver TX_EN pin. When the TTY port is closed in the middle of a transmission (for instance during userland application crash), imx_uart_shutdown disables the interface and disables the Transmission Complete interrupt. afer that, imx_uart_stop_tx bails on an incomplete transmission, to be retriggered by the TC interrupt. This interrupt is disabled and therefore the tx statemachine never transitions out of SEND. The statemachine is in deadlock now, and the TX_EN remains low, making the interface useless. imx_uart_stop_tx now checks for incomplete transmission AND whether TC interrupts are enabled before bailing to be retriggered. This makes sure the state machine handling is reached, and is properly set to WAIT_AFTER_SEND.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu104 products
  • linux< 5.15.0-102.112
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1057.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ cb1a609236096c278ecbfb7be678a693a70283f1, < 6e04a9d30509fb53ba6df5d655ed61d607a7cfda | ≥ cb1a609236096c278ecbfb7be678a693a70283f1, < ff168d4fdb0e1ba35fb413a749b3d6cce918ec19 | ≥ cb1a609236096c278ecbfb7be678a693a70283f1, < 63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06 | ≥ cb1a609236096c278ecbfb7be678a693a70283f1, < 763cd68746317b5d746dc2649a3295c1efb41181 | ≥ cb1a609236096c278ecbfb7be678a693a70283f1, < 9a662d06c22ddfa371958c2071dc350436be802b | ≥ cb1a609236096c278ecbfb7be678a693a70283f1, < 78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0 | 5.9
  • linux_kernel≥ 5.9.0, < 5.10.209 | ≥ 5.11.0, < 5.15.148 | ≥ 5.16.0, < 6.1.75 | ≥ 6.2.0, < 6.6.14 | ≥ 6.7.0, < 6.7.2
Debian1 product
  • linux< 6.1.76-1 | < 6.6.15-1

3 vendors · 107 products

References

21 links
Show all 21 references