CVE-2026-68401
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel's arm_ffa driver, there are out-of-bounds writes in ffa_setup_and_transmit(), especially for FFA versions < 1.2 where the reserved field has offset 24 but the size returned is 16 bytes. There is also a lack of size check for constituents.
Risk Assessment
This could lead to memory corruption, system crashes, or potential exploitation for privilege escalation.
Recommendation
Apply the Linux kernel update containing the fix that zeroes the struct before writing and adds proper size checks.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit() Sashiko (locally) reports multiple out-of-bound issues in ffa_setup_and_transmit: 1) Writing ep_mem_access->reserved can write out of bounds for FFA versions < 1.2 as ffa_emad_size_get() returns 16 bytes in that case while reserved has an offset of 24. Instead of zeroing fields, memset the struct to zero first based on the FFA version. 2) Make sure there is enough size to write constituents. While at it, convert the only sizeof() in the driver that uses a type instead of variable.