CVE-2026-80748 mmc: loongson2: Fix sg iteration in data reorder functions
Incorrect scatterlist iteration in the Loongson2 MMC driver causes out-of-bounds memory access, potentially leading to system crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80748?
CVE-2026-80748 is a high-severity memory corruption vulnerability in Linux, published on 3 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mmc: loongson2: Fix sg iteration in data reorder functions
In ls2k0500_mmc_reorder_cmd_data() and ls2k2000_mmc_reorder_cmd_data(), the for_each_sg() macro already iterates over the scatterlist entries, with 'sg' pointing to the current entry. However, the code incorrectly uses '&sg[i]' and 'sg_dma_len(&sg[i])' inside the loop, which treats 'sg' as an array base and indexes it again, leading to access of wrong sg entries (or out-of-bounds if the list is not an array).
Which versions are affected by CVE-2026-80748?
How do I fix CVE-2026-80748?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80748 being exploited?
There is no known exploitation of CVE-2026-80748 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80748, DEBIAN-CVE-2026-80748, GHSA-rcvm-9rhr-j437, UBUNTU-CVE-2026-80748.