AIKIDO-2026-274054
zephyrproject-rtos.zephyr is vulnerable to Out-of-Bounds Write
63
Medium Risk
This Affects:
zephyrproject-rtos.zephyrTL;DR
On Xtensa, the LLEXT PLT relocatable link path in llext_link_plt() applies RELA entries at section_base + r_offset without checking that r_offset stays within the target section. A crafted extension ELF can therefore cause a privileged out-of-bounds write during load/link, before extension code runs, corrupting kernel memory or crashing the device. The shared/dynamic PLT branch already validated offsets; the fix adds the same style of bounds check to the relocatable branch and skips out-of-range entries.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you build for Xtensa with CONFIG_LLEXT enabled and load relocatable extension binaries from an untrusted or externally influenced source.
Background info
zephyrproject-rtos.zephyr is vulnerable to Out-of-Bounds Write in versions 3.7.0 - 4.4.1.
How to fix this
Upgrade the zephyrproject-rtos.zephyr library to the patch version.
Links
GitHub Release
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