CVE-2025-38445 Information

Jul 26, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

md/raid1: Fix stack memory use after return in raid1_reshape

In the raid1_reshape function newpool is allocated on the stack and assigned to conf->r1bio_pool. This results in conf->r1bio_pool.wait.head pointing to a stack address. Accessing this address later can lead to a kernel panic.

Example access path:

raid1_reshape()

// newpool is on the stack
mempool_t newpool oldpool;
// initialize newpool.wait.head to stack address
mempool_init(&newpool ...);
conf->r1bio_pool = newpool;

raid1_read_request() or raid1_write_request()

alloc_r1bio()

	mempool_alloc()
	
		// if pool->alloc fails
		remove_element()
		
			--pool->curr_nr;

mempool_free()

if (pool->curr_nr < pool->min_nr) 
	// pool->wait.head is a stack address
	// wake_up() will try to access this invalid address
	// which leads to a kernel panic
	return;
	wake_up(&pool->wait);

Fix: reinit conf->r1bio_pool.wait after assigning newpool.

Reference

https://git.kernel.org/stable/c/12b00ec99624f8da8c325f2dd6e807df26df0025 https://git.kernel.org/stable/c/48da050b4f54ed639b66278d0ae6f4107b2c4e2d https://git.kernel.org/stable/c/5f35e48b76655e45522df338876dfef88dafcc71 https://git.kernel.org/stable/c/61fd5e93006cf82ec8ee5c115ab5cf4bbd104bdb https://git.kernel.org/stable/c/776e6186dc9ecbdb8a1b706e989166c8a99bbf64 https://git.kernel.org/stable/c/d67ed2ccd2d1dcfda9292c0ea8697a9d0f2f0d98 https://git.kernel.org/stable/c/d8a6853d00fbaa810765c8ed2f452a5832273968 https://git.kernel.org/stable/c/df5894014a92ff0196dbc212a7764e97366fd2b7

CNNVD-202507-3296 (Published: 2025-07-25)

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