In the Linux kernel, the following vulnerability has been resolved:
locking/csd_lock: Change csdlock_debug from early_param to __setup
The csdlock_debug kernel-boot parameter is parsed by the early_param() function csdlock_debug(). If set, csdlock_debug() invokes static_branch_enable() to enable csd_lock_wait feature, which triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and CONFIG_SPARSEMEM_VMEMMAP=n.
With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in static_key_enable() and returns NULL, resulting in a NULL dereference because mem_section is initialized only later in sparse_init().
This is also a problem for powerpc because early_param() functions are invoked earlier than jump_label_init(), also resulting in static_key_enable() failures. These failures cause the warning "static key 'xxx' used before call to jump_label_init()".
Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade perf-debuginfoUpgrade perfUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade bpftoolUpgrade kernelUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.15.69-37.134 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade bpftoolUpgrade kernelUpgrade kernel-tools-libs | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | Upgrade linuxUpgrade linux-lowlatencyUpgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-oracleUpgrade linux-gcp-5.15Upgrade linux-raspiUpgrade linux-nvidiaUpgrade linux-gkeUpgrade linux-intel-iotg-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracle-5.15Upgrade linux-realtimeUpgrade linux-hwe-5.15Upgrade linux-gcpUpgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-intel-iotgUpgrade linux-ibmUpgrade linux-riscv-5.15Upgrade linux-gkeopUpgrade linux-aws | Jun 26, 2025 | Jun 18, 2025 |
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