Bug 2513403 (CVE-2026-68185)

Summary: CVE-2026-68185 kernel: LoongArch: Move jump_label_init() before parse_early_param()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel, specifically within the LoongArch architecture. When memory allocation profiling is enabled and then subsequently disabled via a boot parameter, an incorrect order of initialization for `jump_label_init()` and `parse_early_param()` can occur. This can lead to early parameter handlers modifying uninitialized static keys, causing the kernel to fail to boot. This results in a Denial of Service (DoS) for the affected system.
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Description OSIDB Bzimport 2026-08-10 12:35:24 UTC 
In the Linux kernel, the following vulnerability has been resolved:

LoongArch: Move jump_label_init() before parse_early_param()

When enabling both CONFIG_MEM_ALLOC_PROFILING=y and
CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT=y, then diabling memory
profiling by adding the boot parameter 'sysctl.vm.mem_profiling=0' will
cause the kernel failed to boot.

After analysis, this is because jump_label_init() must be called before
parse_early_param(), the early param handlers may modify static keys by
static_branch_enable/disable().

Fix this by moving jump_label_init() to before parse_early_param(). The
solution is similar to other architectures.
Comment 1 gkamathe 2026-08-11 15:59:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081008-CVE-2026-68185-a1de@gregkh/T