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
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)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity47% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
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 4× in last 7d / 46× 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 107 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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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