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2.1

Linux kernel Btrfs may expose data from write-only files

CVE-2010-1636 · published 16 years ago
Summary

The Btrfs file system code in certain Linux kernel versions can copy a file handle without checking if it was opened for reading. This lets a local user read data that should be hidden behind a write‑only file. Update the kernel to a patched version or apply the provided fix to prevent the unauthorized read.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
linux linux_kernel 2.6.29
2.6.29.1
2.6.29.2
2.6.29.3
2.6.29.4
2.6.29.5
2.6.29.6
2.6.30
2.6.30.1
2.6.30.2
2.6.30.3
2.6.30.4
21 more version ranges
cpe:2.3:o:linux:linux_kernel:2.6.29:*:*:*:*:*:*:*
Original advisory text
The btrfs_ioctl_clone function in fs/btrfs/ioctl.c in the btrfs functionality in the Linux kernel 2.6.29 through 2.6.32, and possibly other versions, does not ensure that a cloned file descriptor h...
The btrfs_ioctl_clone function in fs/btrfs/ioctl.c in the btrfs functionality in the Linux kernel 2.6.29 through 2.6.32, and possibly other versions, does not ensure that a cloned file descriptor has been opened for reading, which allows local users to read sensitive information from a write-only file descriptor.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
2.1 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-200Information Exposure
Timeline
Published8 Jun 2010
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2010-1636 · NVD
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