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CVE-2026-43278— dm: clear cloned request bio pointer when last clone bio completes

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinuxab3e1d3bbab9e973aeb4dd4603251578658a47ff< 8d9ddad561136f7e6a9346767bf97b4d79e38e67affected
ab3e1d3bbab9e973aeb4dd4603251578658a47ff< 7daf279c674d515fb22a727a7bbc92aeb35c5442affected
ab3e1d3bbab9e973aeb4dd4603251578658a47ff< e2e738e8dfbbf83bd2bae0467ec4420cc52da42aaffected
ab3e1d3bbab9e973aeb4dd4603251578658a47ff< b1c1a2637ebd675aa2d71fee8c70da8791d73850affected
ab3e1d3bbab9e973aeb4dd4603251578658a47ff< 83d72091804600ead96dc9e9f518ea56cb4942f6affected
ab3e1d3bbab9e973aeb4dd4603251578658a47ff< fb8a6c18fb9a6561f7a15b58b272442b77a242ddaffected
6.1affected
< 6.1unaffected
… +6 more rows
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I. Basic Information for CVE-2026-43278

Vulnerability Information
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Vulnerability Title
dm: clear cloned request bio pointer when last clone bio completes
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dm驱动中克隆请求bio指针在最后一个克隆bio完成时未清除，可能导致释放后重用和双重释放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux ab3e1d3bbab9e973aeb4dd4603251578658a47ff ~ 8d9ddad561136f7e6a9346767bf97b4d79e38e67 -
LinuxLinux 6.1 -

II. Public POCs for CVE-2026-43278

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III. Intelligence Information for CVE-2026-43278

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Patches & Fixes for CVE-2026-43278 (8)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-431869.8 CRITICALipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-431859.8 CRITICALksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-432089.8 CRITICALnet: do not pass flow_id to set_rps_cpu()
CVE-2026-431989.8 CRITICALtcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-431259.8 CRITICALdlm: validate length in dlm_search_rsb_tree
CVE-2026-431149.4 CRITICALnetfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-431179.1 CRITICALbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-430839.1 CRITICALnet: ioam6: fix OOB and missing lock
CVE-2026-431979.1 CRITICALnetconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-431878.8 HIGHxfs: delete attr leaf freemap entries when empty
CVE-2026-432838.8 HIGHnet: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-432158.8 HIGHcifs: Fix locking usage for tcon fields
CVE-2026-431588.8 HIGHxfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-431768.8 HIGHwifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-432328.8 HIGHnet: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-431128.8 HIGHfs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-431138.8 HIGHwifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-431108.8 HIGHwifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-431728.8 HIGHwifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-432398.8 HIGHsmb: client: prevent races in ->query_interfaces()

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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