# CVE-2025-38444: raid10: cleanup memleak at raid10_make_request

Status: published. Published: 2025-07-25. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 39db562b3fedb93978a7e42dd216b306740959f8; < 10c6021a609deb95f23f0cc2f89aa9d4bffb14c7 (affected, git); ≥ c9aa889b035fca4598ae985a0f0c76ebbb547ad2; < 9af149ca9d0dab6e59e813519d309eff62499864 (affected, git); ≥ c9aa889b035fca4598ae985a0f0c76ebbb547ad2; < 8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d (affected, git); ≥ c9aa889b035fca4598ae985a0f0c76ebbb547ad2; < 2941155d9a5ae098b480d551f3a5f8605d4f9af5 (affected, git); ≥ c9aa889b035fca4598ae985a0f0c76ebbb547ad2; < ed7bcd9f617e4107ac0813c516e72e6b8f6029bd (affected, git); ≥ c9aa889b035fca4598ae985a0f0c76ebbb547ad2; < 43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 (affected, git); ≥ 5.15.111; < 5.15.189 (affected, semver). Source: CNA: Linux
- Linux / Linux: 5.17 (affected); ≥ 0; < 5.17 (unaffected, semver); ≥ 5.15.189; ≤ 5.15.* (unaffected, semver); ≥ 6.1.146; ≤ 6.1.* (unaffected, semver); ≥ 6.6.99; ≤ 6.6.* (unaffected, semver); ≥ 6.12.39; ≤ 6.12.* (unaffected, semver); ≥ 6.15.7; ≤ 6.15.* (unaffected, semver); ≥ 6.16; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-05; percentile 7.60%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/10c6021a609deb95f23f0cc2f89aa9d4bffb14c7 (CNA: Linux)

- https://git.kernel.org/stable/c/9af149ca9d0dab6e59e813519d309eff62499864 (CNA: Linux)

- https://git.kernel.org/stable/c/8fc3d7b23d139e3cbc944c15d99b3cdbed797d2d (CNA: Linux)

- https://git.kernel.org/stable/c/2941155d9a5ae098b480d551f3a5f8605d4f9af5 (CNA: Linux)

- https://git.kernel.org/stable/c/ed7bcd9f617e4107ac0813c516e72e6b8f6029bd (CNA: Linux)

- https://git.kernel.org/stable/c/43806c3d5b9bb7d74ba4e33a6a8a41ac988bde24 (CNA: Linux)

- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (ADP: CVE)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2025-38444; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-38444; retrieved 2026-11-05; source updated Not reported

Revision: dfe2752b22411022ae96665e43f3b465802ba2f0fd2ad1cdac63472926bba52f

Canonical: https://y2.dev/cve/CVE-2025-38444

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