CVE-2024-35846 (GCVE-0-2024-35846)
Vulnerability from cvelistv5
Published
2024-05-17 14:47
Modified
2025-05-04 09:06
Severity ?
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: b5ba474f3f518701249598b35c581b92a3c95b48
Version: b5ba474f3f518701249598b35c581b92a3c95b48
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