CVE-2026-31730

Description

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: possible double-free of cctx->remote_heap fastrpc_init_create_static_process() may free cctx->remote_heap on the err_map path but does not clear the pointer. Later, fastrpc_rpmsg_remove() frees cctx->remote_heap again if it is non-NULL, which can lead to a double-free if the INIT_CREATE_STATIC ioctl hits the error path and the rpmsg device is subsequently removed/unbound. Clear cctx->remote_heap after freeing it in the error path to prevent the later cleanup from freeing it again. This issue was found by an in-house analysis workflow that extracts AST-based information and runs static checks, with LLM assistance for triage, and was confirmed by manual code review. No hardware testing was performed.

References

• https://git.kernel.org/stable/c/0bdee4118340c5a756220c1b29a7dab86bb0aa65
• https://git.kernel.org/stable/c/3a164f640953cc982804746e772d379171aff5c6
• https://git.kernel.org/stable/c/4b8e527aca357a6488680713bd88007cf8f547fe
• https://git.kernel.org/stable/c/ba2c83167b215da30fa2aae56b140198cf8d8408
• https://git.kernel.org/stable/c/f67d368d26764a357691b2b3a33d3cb55b435bfc