intelligence_src_350d40f2cc69277bca
- Source-provided label
- Publisher RSS metadata
- Evidence class
- mentioned in report
- Confidence
- Not reported
- Observed
- Dec 13, 2021 00:00 UTC
- Retrieved
- Oct 13, 2026 20:36 UTC
CVE-2021-25491: Kernel NULL Pointer Dereferences due to Missing Error Checks
There are a series of memory corruption vulnerabilities in Samsung Exynos kernels, due to improper error checks, after dma_buf_vmap calls. These bugs can be abused by various privileged processes to cause NULL pointer accesses and crash the kernel. Vulnerability Details The kernel uses the dma_buf_vmap function if it needs to map a dma buffer into the kernel address space to access its content. This function returns a NULL pointer if it encounters an error during its execution. While some drivers employ a null check on the returned pointer, many call sites incorrectly use the IS_ERR macro which explicitly allows NULL pointers.
Reference details
- Source category
- research-report
- First reported
- Dec 13, 2021 00:00 UTC
- Last reported
- Dec 13, 2021 00:00 UTC
- Catalog updated
- Oct 13, 2026 20:36 UTC
- Record ID
daee3ab7271cb23071dac707c4787cdc906fd2c35155c32e9199836f6d1b7370
Published indicators
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Source observations
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1 sources: 0 stale, 0 needing attention, 0 paused, 0 unverified.
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