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Vulnerability record · CVE-2019-25044 · published 14 May 2021

CVE-2019-25044: Linux kernel use after free vulnerability

Linux · Linux Kernel

The block subsystem in the Linux kernel before 5.2 has a use-after-free that can lead to arbitrary code execution in the kernel context and privilege escalation, aka CID-c3e2219216c9. This is related to blk_mq_free_rqs and blk_cleanup_queue.

7.8 CVSS 3.1 High EPSS 0.65% · top 51.2% CWE-416 · Use after free
7.8CVSS 3.1 base score, v2 7.2
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The block subsystem in the Linux kernel before 5.2 has a use-after-free that can lead to arbitrary code execution in the kernel context and privilege escalation, aka CID-c3e2219216c9. This is related to blk_mq_free_rqs and blk_cleanup_queue.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2 PatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c3e2219216c92919a6bd1711f340f5faa98695e6 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210629-0006/ Third Party Advisory
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-blk_mq_free_rqs Third Party Advisory
https://syzkaller.appspot.com/bug?id=36fe241584203cf394d44560a42e3430434f1213 ExploitThird Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2 PatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c3e2219216c92919a6bd1711f340f5faa98695e6 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210629-0006/ Third Party Advisory
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-blk_mq_free_rqs Third Party Advisory
https://syzkaller.appspot.com/bug?id=36fe241584203cf394d44560a42e3430434f1213 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-25044), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.