linux-cve-announce - CVE-2025-22046: uprobes/x86: Harden uretprobe syscall trampoline check

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Message-ID: <2025041601-CVE-2025-22046-e5b9@gregkh>
Date: Wed, 16 Apr 2025 16:12:17 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22046: uprobes/x86: Harden uretprobe syscall trampoline check

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

uprobes/x86: Harden uretprobe syscall trampoline check

Jann reported a possible issue when trampoline_check_ip returns
address near the bottom of the address space that is allowed to
call into the syscall if uretprobes are not set up:

   https://lore.kernel.org/bpf/202502081235.5A6F352985@keescook/T/#m9d416df341b8fbc11737dacbcd29f0054413cbbf

Though the mmap minimum address restrictions will typically prevent
creating mappings there, let's make sure uretprobe syscall checks
for that.

The Linux kernel CVE team has assigned CVE-2025-22046 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.11 with commit ff474a78cef5cb5f32be52fe25b78441327a2e7c and fixed in 6.12.23 with commit c35771342e47d58ab9433f3be1c3c30f2c5fa4f3
	Issue introduced in 6.11 with commit ff474a78cef5cb5f32be52fe25b78441327a2e7c and fixed in 6.13.11 with commit b0065d712049c87e1994c6eac00c6a637e39b325
	Issue introduced in 6.11 with commit ff474a78cef5cb5f32be52fe25b78441327a2e7c and fixed in 6.14.2 with commit d4e48b8d59fe162938a5004ace698c847e6a3207
	Issue introduced in 6.11 with commit ff474a78cef5cb5f32be52fe25b78441327a2e7c and fixed in 6.15-rc1 with commit fa6192adc32f4fdfe5b74edd5b210e12afd6ecc0

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-22046
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	arch/x86/kernel/uprobes.c
	include/linux/uprobes.h
	kernel/events/uprobes.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/c35771342e47d58ab9433f3be1c3c30f2c5fa4f3
	https://git.kernel.org/stable/c/b0065d712049c87e1994c6eac00c6a637e39b325
	https://git.kernel.org/stable/c/d4e48b8d59fe162938a5004ace698c847e6a3207
	https://git.kernel.org/stable/c/fa6192adc32f4fdfe5b74edd5b210e12afd6ecc0