CVE-2023-53219
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-12-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: media: netup_unidvb: fix use-after-free at del_timer() When Universal DVB card is detaching, netup_unidvb_dma_fini() uses del_timer() to stop dma->timeout timer. But when timer handler netup_unidvb_dma_timeout() is running, del_timer() could not stop it. As a result, the use-after-free bug could happen. The process is shown below: (cleanup routine) | (timer routine) | mod_timer(&dev->tx_sim_timer, ..) netup_unidvb_finidev() | (wait a time) netup_unidvb_dma_fini() | netup_unidvb_dma_timeout() del_timer(&dma->timeout); | | ndev->pci_dev->dev //USE Fix by changing del_timer() to del_timer_sync().
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Meta Information
Published
2025-09-15
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-09-15
EPSS Evaluated
2026-06-15
NVD
CVE-2023-53219
Affected Vendors & Products
Showing 9 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 4.3 (inc) to 4.14.316 (exc)
linux linux_kernel From 4.15 (inc) to 4.19.284 (exc)
linux linux_kernel From 4.20 (inc) to 5.4.244 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.181 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.113 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.30 (exc)
linux linux_kernel From 6.2 (inc) to 6.3.4 (exc)
linux linux_kernel 6.4
linux linux_kernel 6.4
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability is a use-after-free bug in the Linux kernel's netup_unidvb media driver. When a Universal DVB card is detaching, the function netup_unidvb_dma_fini() calls del_timer() to stop a timeout timer. However, if the timer handler netup_unidvb_dma_timeout() is currently running, del_timer() cannot stop it, leading to a use-after-free condition where the timer handler accesses memory that has already been freed. The fix involved replacing del_timer() with del_timer_sync() to ensure the timer handler has finished before freeing memory.

Impact Analysis

This use-after-free vulnerability can lead to undefined behavior such as system crashes, memory corruption, or potential privilege escalation if exploited. It may cause instability in systems using the affected Linux kernel media driver, potentially impacting system reliability and security.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version that includes the fix where del_timer() is replaced with del_timer_sync() in the netup_unidvb driver. This prevents the use-after-free bug during Universal DVB card detachment.

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