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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
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 17, 2024 |
| Ubuntu | — | Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-kvmUpgrade linux-image-6.8.0-40-genericUpgrade linux-image-oracle-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1010-oemUpgrade linux-image-oem-24.04aUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1013-awsUpgrade linux-image-6.8.0-1010-ibmUpgrade linux-image-azureUpgrade linux-image-gcpUpgrade linux-image-6.8.0-1011-nvidia-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-genericUpgrade linux-image-6.8.0-1010-oracle-64kUpgrade linux-image-virtualUpgrade linux-image-generic-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1009-raspiUpgrade linux-image-6.8.0-40-lowlatencyUpgrade linux-image-6.8.0-1011-nvidiaUpgrade linux-image-6.8.0-1012-azureUpgrade linux-image-oracleUpgrade linux-image-generic-lpaeUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1008-gkeUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1011-nvidia-lowlatencyUpgrade linux-image-azure-fdeUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-40-generic-64kUpgrade linux-image-6.8.0-1011-nvidia-64kUpgrade linux-image-ibmUpgrade linux-image-lowlatency-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-1012-azure-fdeUpgrade linux-image-6.8.0-1010-oracleUpgrade linux-image-awsUpgrade linux-image-6.8.0-40-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1012-gcp | Aug 9, 2024 | May 17, 2024 |
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