CVE-2026-31730

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0871561055e666da421d779397efcc1e5e964cab < 4b8e527aca357a6488680713bd88007cf8f547feaffected
LinuxLinux0871561055e666da421d779397efcc1e5e964cab < 0bdee4118340c5a756220c1b29a7dab86bb0aa65affected
LinuxLinux0871561055e666da421d779397efcc1e5e964cab < 3a164f640953cc982804746e772d379171aff5c6affected
LinuxLinux0871561055e666da421d779397efcc1e5e964cab < f67d368d26764a357691b2b3a33d3cb55b435bfcaffected
LinuxLinux0871561055e666da421d779397efcc1e5e964cab < ba2c83167b215da30fa2aae56b140198cf8d8408affected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References