CVE-2024-35846

In the Linux kernel, the following vulnerability has been resolved: mm: zswap: fix shrinker NULL crash with cgroup_disable=memory Christian reports a NULL deref in zswap that he bisected down to the zswap shrinker. The issue also cropped up in the bug trackers of libguestfs [1] and the Red Hat bugzilla [2]. The problem is that when memcg is disabled with the boot time flag, the zswap shrinker might get called with sc->memcg == NULL. This is okay in many places, like the lruvec operations. But it crashes in memcg_page_state() - which is only used due to the non-node accounting of cgroup's the zswap memory to begin with. Nhat spotted that the memcg can be NULL in the memcg-disabled case, and I was then able to reproduce the crash locally as well. [1] https://github.com/libguestfs/libguestfs/issues/139 [2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252

The following products are affected by CVE-2024-35846 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-35846.

URL	Resource
https://git.kernel.org/stable/c/682886ec69d22363819a83ddddd5d66cb5c791e1
https://git.kernel.org/stable/c/b0fdabc908a7f81d12382c87ca9e46a9c2e14042
https://lore.kernel.org/linux-cve-announce/2024051738-CVE-2024-35846-d8bf@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-35846
https://www.cve.org/CVERecord?id=CVE-2024-35846