https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 14:20:02 +0000 https://vulnerability.circl.lu/vuln/cve-2022-50091 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>locking/csd_lock: Change csdlock_debug from early_param to __setup</p> <p>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.</p> <p>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().</p> <p>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 &#34;static key &#39;xxx&#39; used before call to jump_label_init()&#34;.</p> <p>Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>locking/csd_lock: Change csdlock_debug from early_param to __setup</p> <p>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.</p> <p>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().</p> <p>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 &#34;static key &#39;xxx&#39; used before call to jump_label_init()&#34;.</p> <p>Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.</p> https://vulnerability.circl.lu/vuln/cve-2022-50091