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Vulnerability record · CVE-2026-31730 · published 1 May 2026

CVE-2026-31730: Linux kernel double free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.7% CWE-415 · Double free
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-31730), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.