Local service crash via HUPCL-gated null dereference
Published Oct 21, 2024 · Updated May 12, 2026
NULL pointer dereference in the Linux serial core allows local users to crash affected systems during UART shutdown with HUPCL set. The uart_shutdown function passes a null uart_port pointer to uart_port_dtr_rts because that call remains outside the preceding null check. Reaching the fault requires low-privileged local access, a UART shutdown path with HUPCL enabled, and a null port; the resulting kernel fault interrupts service without reported data exposure or modification.
Summary
What happened
NULL pointer dereference in the Linux serial core allows local users to crash affected systems during UART shutdown with HUPCL set. The uart_shutdown function passes a null uart_port pointer to uart_port_dtr_rts because that call remains outside the preceding null check. Reaching the fault requires low-privileged local access, a UART shutdown path with HUPCL enabled, and a null port; the resulting kernel fault interrupts service without reported data exposure or modification.
The record
- CVE
- CVE-2024-50058
- Published
- Oct 21, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-476, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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