CVE-2026-46107

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-28. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

May 28, 2026

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Jun 3, 2026
No patch confirmed yet.
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f49b41c9eb7c6ff00df27cd49cea210abbadd8ad
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f06f6aededd792a754cd677c02b3d3016d868c2c
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/85311a585a26640760cd0f3349ab9f2905691044
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5ec0debbcfd43596e32c1239e993de06a704e04c
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/323d252a4a378834e4fe68298ca61cfc5dd3a460
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/12161e03d33afce781f68fa11cc6060538862fad
generic

dm-thin: fix metadata refcount underflow - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/09a65adc7d8bbfce06392cb6d375468e2728ead5

Vendor Advisories for CVE-2026-46107(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(31)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-28.28) @ resolute2026-09-14ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-09-14ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1009.9) @ resolute2026-09-14ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-14ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-09-14ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-09-14ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-14ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-14ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-09-14ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-09-14ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-09-14ubuntu
linuxKernel @ 5.10.259—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.88-1~bpo12+1 (21 versions)6.12.88-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.7-1~bpo13+1 (136 versions)7.0.7-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 306 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:31 UTCEPSS rescore
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-14 07:28 UTCEG score recompute
  6. 2026-09-14 07:28 UTCVendor advisory
  7. 2026-09-14 07:27 UTCGHSA enrichment
  8. 2026-09-13 16:47 UTCEPSS rescore
  9. 2026-09-13 03:09 UTCOSV refresh
  10. 2026-09-12 15:01 UTCEPSS rescore
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 09:37 UTCEPSS rescore
  13. 2026-09-10 09:34 UTCEPSS rescore
  14. 2026-09-08 22:00 UTCEPSS rescore
  15. 2026-09-07 16:01 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-04 05:06 UTCEPSS rescore
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 04:58 UTCEG score recompute
  2. 2026-08-25 04:58 UTCVendor advisory
  3. 2026-08-25 04:58 UTCGHSA enrichment
  4. 2026-08-23 14:49 UTCEG score recompute
  5. 2026-08-23 14:49 UTCVendor advisory
  6. 2026-08-23 14:49 UTCGHSA enrichment
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 15:56 UTCEG score recompute
  10. 2026-08-21 15:56 UTCVendor advisory
  11. 2026-08-21 15:55 UTCGHSA enrichment
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-20 22:35 UTCVendor advisory
  14. 2026-08-20 22:34 UTCGHSA enrichment
  15. 2026-08-20 11:10 UTCEG score recompute
  16. 2026-08-20 11:10 UTCVendor advisory
  17. 2026-08-20 11:09 UTCGHSA enrichment
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 09:02 UTCVendor advisory
  22. 2026-08-17 09:02 UTCGHSA enrichment
  23. 2026-08-16 15:11 UTCEG score recompute
  24. 2026-08-16 15:11 UTCVendor advisory
  25. 2026-08-16 15:11 UTCGHSA enrichment
  26. 2026-08-16 14:56 UTCEPSS rescore
  27. 2026-08-16 02:41 UTCEG score recompute
  28. 2026-08-16 02:41 UTCVendor advisory
  29. 2026-08-16 02:41 UTCGHSA enrichment
  30. 2026-08-16 02:14 UTCEPSS rescore
  31. 2026-08-15 01:30 UTCEPSS rescore
  32. 2026-08-15 00:07 UTCVendor advisory
  33. 2026-08-15 00:07 UTCGHSA enrichment
  34. 2026-08-14 12:44 UTCVendor advisory
  35. 2026-08-14 12:44 UTCGHSA enrichment
  36. 2026-08-14 01:21 UTCEG score recompute
  37. 2026-08-14 01:21 UTCVendor advisory
  38. 2026-08-14 01:21 UTCGHSA enrichment
  39. 2026-08-13 22:00 UTCEPSS rescore
  40. 2026-08-13 01:14 UTCVendor advisory
  41. 2026-08-13 01:14 UTCGHSA enrichment
  42. 2026-08-12 13:51 UTCEG score recompute
  43. 2026-08-12 13:51 UTCVendor advisory
  44. 2026-08-12 13:51 UTCGHSA enrichment
  45. 2026-08-12 13:51 UTCEPSS rescore
  46. 2026-08-12 00:53 UTCEG score recompute
  47. 2026-08-12 00:53 UTCVendor advisory
  48. 2026-08-12 00:53 UTCGHSA enrichment
  49. 2026-08-11 13:30 UTCVendor advisory
  50. 2026-08-11 13:30 UTCGHSA enrichment
  51. 2026-08-11 00:08 UTCEG score recompute
  52. 2026-08-11 00:08 UTCVendor advisory
  53. 2026-08-11 00:08 UTCGHSA enrichment
  54. 2026-08-11 00:00 UTCEPSS rescore
  55. 2026-08-10 08:26 UTCVendor advisory
  56. 2026-08-10 08:26 UTCGHSA enrichment
  57. 2026-08-09 21:03 UTCEG score recompute
  58. 2026-08-09 21:03 UTCVendor advisory
  59. 2026-08-09 21:03 UTCGHSA enrichment
  60. 2026-08-09 13:46 UTCEPSS rescore
  61. 2026-08-09 09:40 UTCVendor advisory
  62. 2026-08-09 09:40 UTCGHSA enrichment
  63. 2026-08-08 22:17 UTCEG score recompute
  64. 2026-08-08 22:17 UTCVendor advisory
  65. 2026-08-08 22:17 UTCGHSA enrichment
  66. 2026-08-08 16:37 UTCEPSS rescore
  67. 2026-08-08 10:52 UTCVendor advisory
  68. 2026-08-08 10:52 UTCGHSA enrichment
  69. 2026-08-07 23:28 UTCEG score recompute
  70. 2026-08-07 23:28 UTCVendor advisory
  71. 2026-08-07 23:28 UTCGHSA enrichment
  72. 2026-08-07 12:05 UTCVendor advisory
  73. 2026-08-07 12:05 UTCGHSA enrichment
  74. 2026-08-07 00:09 UTCEG score recompute
  75. 2026-08-07 00:09 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-46107?
CVE-2026-46107 is a high vulnerability published on May 28, 2026. 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…
When was CVE-2026-46107 disclosed?
CVE-2026-46107 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46107 actively exploited?
CVE-2026-46107 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-46107?
CVE-2026-46107 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-46107?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46107, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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