CVE-2026-46159

MEDIUM EPSS 0.7%
Published May 28, 20261mo ago · Modified Jun 19, 20261w ago
4.7 CVSS 3.1
Medium
Find Similar
Published May 28, 2026 1mo ago
Last Modified Jun 19, 2026 1w ago

Description

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 Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
0.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-367

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥2.6.34.1  –  <6.6.140
linuxlinux_kernel*≥6.7  –  <6.12.90
linuxlinux_kernel*≥6.13  –  <6.18.32
linuxlinux_kernel*≥6.19  –  <7.0.7
linuxlinux_kernel2.6.34any
linuxlinux_kernel2.6.34any
linuxlinux_kernel2.6.34any
linuxlinux_kernel2.6.34any
linuxlinux_kernel2.6.34any
linuxlinux_kernel2.6.34any
linuxlinux_kernel2.6.34any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d69a4a6813fdba7c4cc3695a7e843842b240790d
  • git.kernel.org https://git.kernel.org/stable/c/d8224b1be6627c6c3b204bfb264508d27c65ac44
  • git.kernel.org https://git.kernel.org/stable/c/f407aad350bdea4db300c47433573b7a41630d33
  • git.kernel.org https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a
    Patch