CVE-2024-41026

What it actually does

Missing bounds check allows transmitted data size to exceed sg_miter length in davinci_mmc driver, triggering kernel panic via buffer overrun.

Why it matters to the business

Systems using affected Linux kernels on DaVinci-based MMC hardware may experience unexpected crashes and service interruption; low exploit probability and no known in-the-wild use limit immediate risk.

How an attack unfolds

An attacker with local access crafts I/O requests that supply a data length larger than the scatter-gather mapping, causing the driver to copy beyond the mapped region and panic the kernel.

How to fix it

Apply the upstream fix present in commit c561c4ecce712f94b442db5960e281f13b28df2e or later; rebuild and deploy the patched kernel to all affected hosts.

How to confirm the fix worked

Verify kernel source contains the length-limiting check against sgm->length before transmission; confirm runtime behavior no longer panics on oversized transfers via targeted test cases.

Typical attack path

1. Obtain local execution on target Linux system
2. Open or manipulate MMC device node associated with davinci_mmc
3. Issue write or transfer request with oversized payload length
4. Driver performs unchecked copy that overruns sg_miter buffer
5. Kernel panic terminates affected process or system

How to detect it

Review kernel logs for oops/panic entries containing davinci_mmc or sg_miter length violations; correlate with process activity writing to MMC device nodes.

What your security team should do

• Prioritize patching kernels on any DaVinci-based embedded or industrial devices
• Monitor for kernel oops or panic logs referencing davinci_mmc or sg_miter
• Restrict unprivileged local access until patches are deployed