CVE-2026-43359 Details
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.
A vulnerability in the Linux kernel's Btrfs filesystem has been addressed, which involved a transaction abort triggered by an item overflow. This issue arose when the 'set received' ioctl was used to add UUIDs to subvolumes. If the same UUID was applied to multiple subvolumes, an overflow would occur, causing the transaction to abort and the filesystem to switch to read-only mode. Notably, this vulnerability could be exploited by users who own the subvolume, without requiring administrative privileges.
The vulnerability has been fixed by adding an early check for item overflow before starting a transaction, ensuring that such overflows do not occur and disrupt filesystem operations.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d | kernel.org | Patch |
| https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac | kernel.org | Patch |
| https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e | kernel.org | Patch |
| https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174 | kernel.org | Patch |
| https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-191 | Integer Underflow (Wrap or Wraparound) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.12, < 6.1.167 >= 6.2, < 6.6.130 >= 6.7, < 6.12.78 >= 6.13, < 6.18.19 >= 6.19, < 6.19.9 7.0 rc1 7.0 rc2 7.0 rc3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 15, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | kernel.org |