CVE-2026-46159

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

Score 4.7 from GitHub Security Advisory published 2026-05-28. NVD baseline CVSS 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak

btrfs_ioctl_space_info() has a TOCTOU race between two passes over the block group RAID type lists. The first pass counts entries to determine the allocation size, then the second pass fills the buffer. The groups_sem rwlock is released between passes, allowing concurrent block group removal to reduce the entry count.

When the second pass fills fewer entries than the first pass counted, copy_to_user() copies the full alloc_size bytes including trailing uninitialized kmalloc bytes to userspace.

Fix by copying only total_spaces entries (the actually-filled count from the second pass) instead of alloc_size bytes, and switch to kzalloc so any future copy size mismatch cannot leak heap data.

CVSS v3
4.7
EG Score
4.7(medium)
EPSS
0.7%
KEV
Not listed

Published

May 28, 2026

Last Modified

June 19, 2026

Advisory Details (8)

Auto-updated Jun 19, 2026
No patch confirmed yet.
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f407aad350bdea4db300c47433573b7a41630d33
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d8224b1be6627c6c3b204bfb264508d27c65ac44
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d69a4a6813fdba7c4cc3695a7e843842b240790d
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088
generic

btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3

Vendor Advisories for CVE-2026-46159(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 65× 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 122 total refreshes for this CVE.

  1. 2026-07-16 10:24 UTCEG score recompute
  2. 2026-07-16 10:24 UTCVendor advisory
  3. 2026-07-16 10:24 UTCGHSA enrichment
  4. 2026-07-15 16:57 UTCEPSS rescore
  5. 2026-07-13 22:30 UTCEPSS rescore
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-11 21:16 UTCEG score recompute
  8. 2026-07-11 21:16 UTCVendor advisory
  9. 2026-07-11 21:16 UTCGHSA enrichment
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-08 18:29 UTCEG score recompute
  13. 2026-07-08 18:29 UTCVendor advisory
  14. 2026-07-08 18:29 UTCGHSA enrichment
  15. 2026-07-08 15:16 UTCEPSS rescore
  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-02 14:15 UTCEG score recompute
  20. 2026-07-02 14:15 UTCVendor advisory
  21. 2026-07-02 14:15 UTCGHSA enrichment
  22. 2026-07-01 15:07 UTCEPSS rescore
  23. 2026-07-01 03:10 UTCEG score recompute
  24. 2026-07-01 03:10 UTCVendor advisory
  25. 2026-07-01 03:10 UTCGHSA enrichment
Show 75 more
  1. 2026-06-30 23:22 UTCEPSS rescore
  2. 2026-06-29 20:15 UTCEG score recompute
  3. 2026-06-29 20:15 UTCVendor advisory
  4. 2026-06-29 20:15 UTCGHSA enrichment
  5. 2026-06-29 14:06 UTCEPSS rescore
  6. 2026-06-29 14:06 UTCEPSS rescore
  7. 2026-06-28 20:53 UTCEG score recompute
  8. 2026-06-28 20:53 UTCVendor advisory
  9. 2026-06-28 20:53 UTCGHSA enrichment
  10. 2026-06-28 14:07 UTCEPSS rescore
  11. 2026-06-28 04:56 UTCEPSS rescore
  12. 2026-06-28 04:56 UTCEPSS rescore
  13. 2026-06-27 21:32 UTCEG score recompute
  14. 2026-06-27 21:32 UTCVendor advisory
  15. 2026-06-27 21:32 UTCGHSA enrichment
  16. 2026-06-27 03:08 UTCEPSS rescore
  17. 2026-06-26 22:11 UTCEG score recompute
  18. 2026-06-26 22:11 UTCVendor advisory
  19. 2026-06-26 22:11 UTCGHSA enrichment
  20. 2026-06-25 22:47 UTCEG score recompute
  21. 2026-06-25 22:47 UTCVendor advisory
  22. 2026-06-25 22:47 UTCGHSA enrichment
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 22:46 UTCEG score recompute
  25. 2026-06-24 22:46 UTCVendor advisory
  26. 2026-06-24 22:46 UTCGHSA enrichment
  27. 2026-06-24 14:05 UTCEPSS rescore
  28. 2026-06-21 01:59 UTCEPSS rescore
  29. 2026-06-21 01:59 UTCEPSS rescore
  30. 2026-06-19 19:26 UTCEPSS rescore
  31. 2026-06-19 19:26 UTCEPSS rescore
  32. 2026-06-19 15:13 UTCNVD updateCVSS v3 → 4.7 · severity → MEDIUM
  33. 2026-06-18 17:52 UTCEPSS rescore
  34. 2026-06-18 17:52 UTCEPSS rescore
  35. 2026-06-18 01:27 UTCEG score recompute
  36. 2026-06-18 01:27 UTCVendor advisory
  37. 2026-06-18 01:27 UTCGHSA enrichment
  38. 2026-06-17 17:53 UTCEPSS rescore
  39. 2026-06-17 01:38 UTCEG score recompute
  40. 2026-06-17 01:38 UTCGHSA enrichment
  41. 2026-06-16 02:17 UTCEG score recompute
  42. 2026-06-16 02:17 UTCVendor advisory
  43. 2026-06-16 02:17 UTCGHSA enrichment
  44. 2026-06-15 17:49 UTCEPSS rescore
  45. 2026-06-15 02:56 UTCEG score recompute
  46. 2026-06-15 02:56 UTCVendor advisory
  47. 2026-06-15 02:56 UTCGHSA enrichment
  48. 2026-06-14 23:28 UTCMITRE cvelistV5
  49. 2026-06-14 03:34 UTCEG score recompute
  50. 2026-06-14 03:34 UTCVendor advisory
  51. 2026-06-14 03:33 UTCGHSA enrichment
  52. 2026-06-13 23:00 UTCEPSS rescore
  53. 2026-06-13 04:13 UTCEG score recompute
  54. 2026-06-13 04:13 UTCVendor advisory
  55. 2026-06-13 04:12 UTCGHSA enrichment
  56. 2026-06-12 23:12 UTCEPSS rescore
  57. 2026-06-12 23:12 UTCEPSS rescore
  58. 2026-06-12 04:46 UTCEG score recompute
  59. 2026-06-12 04:46 UTCGHSA enrichment
  60. 2026-06-11 14:00 UTCEPSS rescore
  61. 2026-06-11 05:25 UTCEG score recompute
  62. 2026-06-11 05:25 UTCVendor advisory
  63. 2026-06-11 05:25 UTCGHSA enrichment
  64. 2026-06-10 22:18 UTCEPSS rescore
  65. 2026-06-10 13:22 UTCEPSS rescore
  66. 2026-06-10 13:22 UTCEPSS rescore
  67. 2026-06-10 06:04 UTCEG score recompute▲ 4.70
  68. 2026-06-10 06:04 UTCGHSA enrichment
  69. 2026-06-09 21:17 UTCNVD updateCVSS v3 → 4.7 · severity → MEDIUM
  70. 2026-06-08 14:17 UTCEPSS rescore
  71. 2026-06-08 14:17 UTCEPSS rescore
  72. 2026-06-07 15:25 UTCEPSS rescore
  73. 2026-06-07 15:25 UTCEPSS rescore
  74. 2026-06-07 04:27 UTCGHSA enrichment
  75. 2026-06-07 04:27 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-46159?
CVE-2026-46159 is a medium vulnerability published on May 28, 2026. In the Linux kernel, the following vulnerability has been resolved: btrfs: fix btrfsioctlspaceinfo() slotcount TOCTOU which can lead to info-leak btrfsioctlspace_info() has a TOCTOU race between two passes over the block group RAID type lists. The first pass counts entries to determine the…
When was CVE-2026-46159 disclosed?
CVE-2026-46159 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46159 actively exploited?
CVE-2026-46159 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46159?
CVE-2026-46159 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-46159?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46159, 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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