In the Linux kernel, the following vulnerability has been resolved:
zsmalloc: fix races between asynchronous zspage free and page migration
The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races.
It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process).
Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftoolUpgrade kernel-toolsUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.50-23.125Upgrade kernel-livepatch-4.14.285-215.501Upgrade kernelUpgrade kernel-tools-develUpgrade kernel-livepatch-5.10.126-117.518Upgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade perfUpgrade python-perfUpgrade perf-debuginfo | May 21, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libsUpgrade bpftool | Jun 11, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade bpftoolUpgrade kernel-toolsUpgrade python3-perf | Jun 11, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-ibmUpgrade linux-nvidiaUpgrade linux-ibm-5.4Upgrade linuxUpgrade linux-iotUpgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-gcp-4.15Upgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-gcp-5.4Upgrade linux-gcpUpgrade linux-azure-fipsUpgrade linux-hweUpgrade linux-azure-4.15Upgrade linux-gkeopUpgrade linux-azure-5.4Upgrade linux-oracle-5.15Upgrade linux-hwe-5.4Upgrade linux-riscv-5.15Upgrade linux-oracle-5.4Upgrade linux-aws-hweUpgrade linux-lowlatencyUpgrade linux-aws-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-azureUpgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-raspiUpgrade linux-aws-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-awsUpgrade linux-hwe-5.15Upgrade linux-bluefieldUpgrade linux-gke | Mar 3, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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