CVE-2026-46159

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-46159
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.

4.7 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3 Patch
https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088 Patch
https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77 Patch
https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641 Patch
https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc7:*:*:*:*:*:*
History

09 Jun 2026, 21:06

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.34:rc4:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 4.7
CWE CWE-367
References () https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3 - () https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3 - Patch
References () https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088 - () https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088 - Patch
References () https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77 - () https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77 - Patch
References () https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641 - () https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641 - Patch
References () https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a - () https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a - Patch

28 May 2026, 10:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-28 10:16

Updated : 2026-06-09 21:06

NVD link : CVE-2026-46159

Mitre link : CVE-2026-46159

CVE.ORG link : CVE-2026-46159

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition