CVE-2023-53458None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish() When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call d…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
media: cx23885: Fix a null-ptr-deref bug in buffer_prepare() and buffer_finish()
When the driver calls cx23885_risc_buffer() to prepare the buffer, the function call dma_alloc_coherent may fail, resulting in a empty buffer risc->cpu. Later when we free the buffer or access the buffer, null ptr deref is triggered.
This bug is similar to the following one: https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.
We believe the bug can be also dynamically triggered from user side. Similarly, we fix this by checking the return value of cx23885_risc_buffer() and the value of risc->cpu before buffer free.
Linux >= 4d63a25c4523b5d18e5307897d56aff785f43bf5 < f0a06203f2fe63f04311467200c99c4ee1926578Linux >= 4d63a25c4523b5d18e5307897d56aff785f43bf5 < 6738841f6fcf23e9fc30e2449f32fc84ee19c6f1Linux >= 4d63a25c4523b5d18e5307897d56aff785f43bf5 < 5b8e5e28e85a546dfccc3895befe0e823fdd7c89Linux >= 4d63a25c4523b5d18e5307897d56aff785f43bf5 < 47e8b73bc35d7c54642f78e498697692f6358996Linux 3.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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