CVE-2024-26783

/// Technical description

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

mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index

With numa balancing on, when a numa system is running where a numa node

doesn't have its local memory so it has no managed zones, the following

oops has been observed. It's because wakeup_kswapd() is called with a

wrong zone index, -1. Fixed it by checking the index before calling

wakeup_kswapd().

> BUG: unable to handle page fault for address: 00000000000033f3

> #PF: supervisor read access in kernel mode

> #PF: error_code(0x0000) - not-present page

> PGD 0 P4D 0

> Oops: 0000 [#1] PREEMPT SMP NOPTI

> CPU: 2 PID: 895 Comm: masim Not tainted 6.6.0-dirty #255

> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS

> rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014

> RIP: 0010:wakeup_kswapd (./linux/mm/vmscan.c:7812)

> Code: (omitted)

> RSP: 0000:ffffc90004257d58 EFLAGS: 00010286

> RAX: ffffffffffffffff RBX: ffff88883fff0480 RCX: 0000

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References