linux-cve-announce - CVE-2024-49573: sched/fair: Fix NEXT

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Message-ID: <2025011142-CVE-2024-49573-fa46@gregkh>
Date: Sat, 11 Jan 2025 13:35:47 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-49573: sched/fair: Fix NEXT_BUDDY

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

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

sched/fair: Fix NEXT_BUDDY

Adam reports that enabling NEXT_BUDDY insta triggers a WARN in
pick_next_entity().

Moving clear_buddies() up before the delayed dequeue bits ensures
no ->next buddy becomes delayed. Further ensure no new ->next buddy
ever starts as delayed.

The Linux kernel CVE team has assigned CVE-2024-49573 to this issue.


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

	Issue introduced in 6.12 with commit 152e11f6df293e816a6a37c69757033cdc72667d and fixed in 6.12.7 with commit 5dbe6816c49197677a5ecce749bd99929da147da
	Issue introduced in 6.12 with commit 152e11f6df293e816a6a37c69757033cdc72667d and fixed in 6.13-rc3 with commit 493afbd187c4c9cc1642792c0d9ba400c3d6d90d

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-2024-49573
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:
	kernel/sched/fair.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/5dbe6816c49197677a5ecce749bd99929da147da
	https://git.kernel.org/stable/c/493afbd187c4c9cc1642792c0d9ba400c3d6d90d