CVE-2025-37898: powerpc64/ftrace: fix module loading without patchable function entries

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-20 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: powerpc64/ftrace: fix module loading without patchable function entries get_stubs_size assumes that there must always be at least one patchable function entry, which is not always the case (modules that export data but no code), otherwise it returns -ENOEXEC and thus the section header sh_size is set to that value. During module_memory_alloc() the size is passed to execmem_alloc() after being page-aligned and thus set to zero which will cause it to fail the allocation (and thus module loading) as __vmalloc_node_range() checks for zero-sized allocs and returns null: [ 115.466896] module_64: cast_common: doesn't contain __patchable_function_entries. [ 115.469189] ------------[ cut here ]------------ [ 115.469496] WARNING: CPU: 0 PID: 274 at mm/vmalloc.c:3778 __vmalloc_node_range_noprof+0x8b4/0x8f0 ... [ 115.478574] ---[ end trace 0000000000000000 ]--- [ 115.479545] execmem: unable to allocate memory Fix this by removing the check completely, since it is anyway not helpful to propagate this as an error upwards.

Affected products

Linux kernel: from 6.13 before 6.14.6; 6.15-rc1, 6.15-rc2, 6.15-rc3, 6.15-rc4 — fixed in 6.14.6

How to fix

Upgrade to a fixed version: Linux kernel 6.14.6. Check the vendor advisory for mitigations.

References

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