CVE-2026-31730

Kernel memory corruption via stale FastRPC pointer

Published May 1, 2026 · Updated May 1, 2026

A double-free in Linux Kernel 6.2 and later allows local users with root privileges to corrupt kernel memory through a FastRPC ioctl. The err_map path in fastrpc_init_create_static_process() frees cctx->remote_heap without clearing it, so fastrpc_rpmsg_remove() later frees the stale pointer again. Triggering requires access to the mode-0600 FastRPC device, an INIT_CREATE_STATIC ioctl error, and subsequent removal or unbinding of the rpmsg device.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double-free in Linux Kernel 6.2 and later allows local users with root privileges to corrupt kernel memory through a FastRPC ioctl. The err_map path in fastrpc_init_create_static_process() frees cctx->remote_heap without clearing it, so fastrpc_rpmsg_remove() later frees the stale pointer again. Triggering requires access to the mode-0600 FastRPC device, an INIT_CREATE_STATIC ioctl error, and subsequent removal or unbinding of the rpmsg device.

The record

CVE
CVE-2026-31730
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0871561055e666da421d779397efcc1e5e964cab <0bdee4118340c5a756220c1b29a7dab86bb0aa65
  2. Affected versionversion=0871561055e666da421d779397efcc1e5e964cab <3a164f640953cc982804746e772d379171aff5c6
  3. Affected versionversion=0871561055e666da421d779397efcc1e5e964cab <4b8e527aca357a6488680713bd88007cf8f547fe
  4. Affected versionversion=0871561055e666da421d779397efcc1e5e964cab <ba2c83167b215da30fa2aae56b140198cf8d8408
  5. Affected versionversion=0871561055e666da421d779397efcc1e5e964cab <f67d368d26764a357691b2b3a33d3cb55b435bfc
  6. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0871561055e666da421d779397efcc1e5e964cab <0bdee4118340c5a756220c1b29a7dab86bb0aa65; version=0871561055e666da421d779397efcc1e5e964cab <3a164f640953cc982804746e772d379171aff5c6; version=0871561055e666da421d779397efcc1e5e964cab <4b8e527aca357a6488680713bd88007cf8f547fe; version=0871561055e666da421d779397efcc1e5e964cab <ba2c83167b215da30fa2aae56b140198cf8d8408; version=0871561055e666da421d779397efcc1e5e964cab <f67d368d26764a357691b2b3a33d3cb55b435bfc; version=6.2

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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