# CVE-2024-35846: linux: In the Linux kernel, the following vulnerability has been resolved:  mm: zswap: fix shrinker NULL crash with cgroup_d...

CVE-2024-35846 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-35846, released May 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-35846
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 17, 2024

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.8.9-1 | [DEBIAN-CVE-2024-35846](https://patchblox.com/security/data/fix/linux/debian-cve-2024-35846.md) | May 17, 2024 |
| Linux | linux Debian 14 | 6.8.9-1 | [DEBIAN-CVE-2024-35846](https://patchblox.com/security/data/fix/linux/debian-cve-2024-35846.md) | May 17, 2024 |

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