4.7

CVE-2026-46159

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.34.1 < 6.6.140
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.90
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.32
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.7
Linux ≫ Linux Kernel Version2.6.34 Update-
Linux ≫ Linux Kernel Version2.6.34 Updaterc2
Linux ≫ Linux Kernel Version2.6.34 Updaterc3
Linux ≫ Linux Kernel Version2.6.34 Updaterc4
Linux ≫ Linux Kernel Version2.6.34 Updaterc5
Linux ≫ Linux Kernel Version2.6.34 Updaterc6
Linux ≫ Linux Kernel Version2.6.34 Updaterc7
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.09% 0.007
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

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