Riskcovery

CVE-2026-43359

btrfs: fix transaction abort on set received ioctl due to item overflow

State
Published
Severity
Not scored
Published
May 8, 2026
Updated
May 11, 2026
Reserved
May 1, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix transaction abort on set received ioctl due to item overflow

If the set received ioctl fails due to an item overflow when attempting to add the BTRFS_UUID_KEY_RECEIVED_SUBVOL we have to abort the transaction since we did some metadata updates before.

This means that if a user calls this ioctl with the same received UUID field for a lot of subvolumes, we will hit the overflow, trigger the transaction abort and turn the filesystem into RO mode. A malicious user could exploit this, and this ioctl does not even requires that a user has admin privileges (CAP_SYS_ADMIN), only that he/she owns the subvolume.

Fix this by doing an early check for item overflow before starting a transaction. This is also race safe because we are holding the subvol_sem semaphore in exclusive (write) mode.

A test case for fstests will follow soon.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 to before b9914db13ac15aca3b74544c0bb1a2e0dad1f174Affected
  • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 to before b19c0465e4daad5aa8f60552ea0578cf31a11b1eAffected
  • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 to before 2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5Affected
  • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 to before d11aefe654a04fc41996d254748d6a38b6b0a7beAffected
  • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 to before 41fb97353ff58fa4f31904c343fc8e3df2f7517dAffected
  • dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 to before 87f2c46003fce4d739138aab4af1942b1afdadacAffected
LinuxLinux
  • 3.12Affected
  • before 3.12Not affected
  • 6.1.167 through 6.1.*Not affected
  • 6.6.130 through 6.6.*Not affected
  • 6.12.78 through 6.12.*Not affected
  • 6.18.19 through 6.18.*Not affected
  • 6.19.9 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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