CVE-2026-53160

Analyzed Analyzed - Analysis Complete

Use-After-Free in Linux Kernel FastRPC Module

Publication date: 2026-06-25

Last updated on: 2026-07-06

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: fix use-after-free race in fastrpc_map_create fastrpc_map_lookup returns a raw pointer after releasing fl->lock. The caller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero) on this unprotected pointer. A concurrent MEM_UNMAP can free the map between the lock release and the kref operation, resulting in a use-after-free on the freed slab object. Restore the take_ref parameter to fastrpc_map_lookup so the reference is acquired atomically under fl->lock before the pointer is exposed to the caller.

CVSS Scores

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Meta Information

Published

2026-06-25

Last Modified

2026-07-06

Generated

2026-07-15

AI Q&A

2026-06-26

EPSS Evaluated

2026-07-14

NVD

CVE-2026-53160

EUVD

EUVD-2026-39251

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	From 6.19 (inc) to 7.0.13 (exc)
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	From 6.1.156 (inc) to 6.1.176 (exc)
linux	linux_kernel	From 6.12.53 (inc) to 6.12.94 (exc)
linux	linux_kernel	From 6.17.3 (inc) to 6.18.36 (exc)
linux	linux_kernel	From 6.6.112 (inc) to 6.6.143 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Mitigation Strategies

The vulnerability in the Linux kernel related to fastrpc_map_create involves a use-after-free race condition. To mitigate this vulnerability immediately, you should update your Linux kernel to a version where this issue has been fixed.

Specifically, ensure that your kernel includes the fix that restores the take_ref parameter to fastrpc_map_lookup so that the reference is acquired atomically under the lock before the pointer is exposed to the caller.

Check your current kernel version.
Obtain and apply the latest kernel update or patch that addresses this vulnerability.
Reboot the system after applying the update to ensure the fix is active.

Executive Summary

This vulnerability is a use-after-free race condition in the Linux kernel's fastrpc component, specifically in the fastrpc_map_create function.

The issue occurs because fastrpc_map_lookup returns a raw pointer after releasing a lock (fl->lock). Then, the caller function fastrpc_map_create calls fastrpc_map_get on this pointer without protection.

Meanwhile, a concurrent MEM_UNMAP operation can free the memory map between the lock release and the reference count operation, causing a use-after-free on the freed slab object.

The fix involves restoring the take_ref parameter to fastrpc_map_lookup so that the reference is acquired atomically while holding the lock, preventing the pointer from being freed concurrently.

Impact Analysis

This vulnerability can lead to a use-after-free condition, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges within the kernel.

Because it involves kernel memory management, exploitation could compromise the security and reliability of the affected system.

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