diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 91b1cdd16569..add62db3e82c 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -6,6 +6,9 @@
 #include <linux/vmalloc.h>
 #include <linux/memory.h>
 #include <linux/execmem.h>
+#include <linux/cleanup.h>
+#include <linux/kgdb.h>
+#include <linux/mmap_lock.h>
 
 #include <asm/text-patching.h>
 #include <asm/insn.h>
@@ -2372,6 +2375,38 @@ static void text_poke_memset(void *dst, const void *src, size_t len)
 
 typedef void text_poke_f(void *dst, const void *src, size_t len);
 
+static void __poke_vmalloc_pages(struct page **pages, void *addr,
+				 bool cross_page_boundary)
+{
+	pages[0] = vmalloc_to_page(addr);
+	if (cross_page_boundary)
+		pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
+}
+
+static void poke_vmalloc_pages(struct page **pages, void *addr,
+			       bool cross_page_boundary)
+{
+	if (in_dbg_master()) {
+		/*
+		 * If called from kgdb cannot sleep, but all other CPUs stopped
+		 * anyway so safe to proceed without locks
+		 */
+		__poke_vmalloc_pages(pages, addr, cross_page_boundary);
+	} else {
+		/*
+		 * execmem ROX ranges are shared between modules and can be
+		 * collapsed to huge PMD entries, and this collapse can happen
+		 * concurrently with a racing set_memory_rox().
+		 *
+		 * Prevent vmalloc_to_page() from racing by acquiring an
+		 * init_mm read lock which pairs with the init_mm write lock in
+		 * cpa_collapse_large_pages().
+		 */
+		guard(mmap_read_lock)(&init_mm);
+		__poke_vmalloc_pages(pages, addr, cross_page_boundary);
+	}
+}
+
 static void *__text_poke(text_poke_f func, void *addr, const void *src, size_t len)
 {
 	bool cross_page_boundary = offset_in_page(addr) + len > PAGE_SIZE;
@@ -2389,9 +2424,7 @@ static void *__text_poke(text_poke_f func, void *addr, const void *src, size_t l
 	BUG_ON(!after_bootmem);
 
 	if (!core_kernel_text((unsigned long)addr)) {
-		pages[0] = vmalloc_to_page(addr);
-		if (cross_page_boundary)
-			pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
+		poke_vmalloc_pages(pages, addr, cross_page_boundary);
 	} else {
 		pages[0] = virt_to_page(addr);
 		WARN_ON(!PageReserved(pages[0]));