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Vulnerability record · CVE-2026-43278 · published 6 May 2026

CVE-2026-43278: Linux kernel double free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: dm: clear cloned request bio pointer when last clone bio completes Stale rq->bio values have been observed to cause double-initialization of cloned bios in request-based device-mapper targets, leading to use-after-free and double-free scenarios. One such case occurs when using dm-multipath on top of a PCIe NVMe namespace, where cloned request bios are freed during blk_complete_request(), but rq->bio is left intact. Subsequent clone teardown then attempts to free the same bios again via blk_rq_unprep_clone(). The resulting double-free path looks like: nvme_pci_complete_batch() nvme_complete_batch() blk_mq_end_request_batch() blk_complete_request() // called on a DM clone request bio_endio() // first free of all clone bios ... rq->end_io() // end_clone_request() dm_complete_request(tio->orig) dm_softirq_done() dm_done() dm_end_request() blk_rq_unprep_clone() // second free of clone bios Fix this by clearing the clone request's bio pointer when the last cloned bio completes, ensuring that later teardown paths do not attempt to free already-released bios.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-415 · Double free
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: dm: clear cloned request bio pointer when last clone bio completes Stale rq->bio values have been observed to cause double-initialization of cloned bios in request-based device-mapper targets, leading to use-after-free and double-free scenarios. One such case occurs when using dm-multipath on top of a PCIe NVMe namespace, where cloned request bios are freed during blk_complete_request(), but rq->bio is left intact. Subsequent clone teardown then attempts to free the same bios again via blk_rq_unprep_clone(). The resulting double-free path looks like: nvme_pci_complete_batch() nvme_complete_batch() blk_mq_end_request_batch() blk_complete_request() // called on a DM clone request bio_endio() // first free of all clone bios ... rq->end_io() // end_clone_request() dm_complete_request(tio->orig) dm_softirq_done() dm_done() dm_end_request() blk_rq_unprep_clone() // second free of clone bios Fix this by clearing the clone request's bio pointer when the last cloned bio completes, ensuring that later teardown paths do not attempt to free already-released bios.

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

Affected products

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

References

LinkTags
https://git.kernel.org/stable/c/7daf279c674d515fb22a727a7bbc92aeb35c5442 Patch
https://git.kernel.org/stable/c/83d72091804600ead96dc9e9f518ea56cb4942f6 Patch
https://git.kernel.org/stable/c/8d9ddad561136f7e6a9346767bf97b4d79e38e67 Patch
https://git.kernel.org/stable/c/b1c1a2637ebd675aa2d71fee8c70da8791d73850 Patch
https://git.kernel.org/stable/c/e2e738e8dfbbf83bd2bae0467ec4420cc52da42a Patch
https://git.kernel.org/stable/c/fb8a6c18fb9a6561f7a15b58b272442b77a242dd Patch
https://git.kernel.org/stable/c/3d746b639be4b4f5cd8ce2b06aa52dc443f50edc Patch
https://git.kernel.org/stable/c/9a95b98202113045bc1a5bcb30388a500f25e050 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43278), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.