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CVE-2026-46107— dm-thin: fix metadata refcount underflow

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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-thin中rebalance_children函数元数据引用计数下溢，可能导致空间映射无法递减块。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< b719d12cb94df345e9ad2715fd0abe9afcaeb111 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< f49b41c9eb7c6ff00df27cd49cea210abbadd8ad affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< f06f6aededd792a754cd677c02b3d3016d868c2c affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 12161e03d33afce781f68fa11cc6060538862fad affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 323d252a4a378834e4fe68298ca61cfc5dd3a460 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 85311a585a26640760cd0f3349ab9f2905691044 affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 5ec0debbcfd43596e32c1239e993de06a704e04c affected
3241b1d3e0aaafbfcd320f4d71ade629728cc4f4< 09a65adc7d8bbfce06392cb6d375468e2728ead5 affected
… +10 more rows
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I. Basic Information for CVE-2026-46107

Vulnerability Information
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Vulnerability Title
dm-thin: fix metadata refcount underflow
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-thin: fix metadata refcount underflow There's a bug in dm-thin in the function rebalance_children. If the internal btree node has one entry, the code tries to copy all btree entries from the node's child to the node itself and then decrement the child's reference count. If the child node is shared (it has reference count > 1), we won't free it, so there would be two pointers to each of the grandchildren nodes. But the reference counts of the grandchildren is not increased, thus the reference count doesn't match the number of pointers that point to the grandchildren. This results in "device mapper: space map common: unable to decrement block" errors. Fix this bug by incrementing reference counts on the grandchildren if the btree node is shared.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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-thin中rebalance_children函数元数据引用计数下溢，可能导致空间映射无法递减块。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 ~ b719d12cb94df345e9ad2715fd0abe9afcaeb111 -
Linux Linux 3.2 -

II. Public POCs for CVE-2026-46107

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III. Intelligence Information for CVE-2026-46107

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Patches & Fixes for CVE-2026-46107 (7)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46119 9.1 CRITICAL libceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46178 7.8 HIGH RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
CVE-2026-46201 7.8 HIGH drm/xe: Fix dma-buf attachment leak in xe_gem_prime_import()

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46107

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