CVE-2026-74646
Received Received - Intake

Race Condition in Linux Kernel FastRPC Subsystem

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74646
EUVD
EUVD-2026-64583

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a race condition in the fastrpc driver. When a system call is interrupted by a signal, the kernel moves memory mappings from one list to another without properly locking the list. This can lead to corruption or improper handling of memory mappings.

Detection Guidance

This vulnerability is specific to the Linux kernel's FastRPC subsystem and requires kernel-level detection. There are no direct network or system commands provided in the context to detect this issue. Monitoring kernel logs for FastRPC-related errors or crashes may indicate exploitation or presence of this vulnerability.

Impact Analysis

This vulnerability could allow an attacker to cause a denial of service or potentially execute arbitrary code with kernel privileges. It may lead to system instability or crashes if exploited.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. Since the issue is resolved in a specific kernel version, applying the official patch or upgrading the kernel will mitigate the risk. Check your distribution's security advisories for the patched kernel version.

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