CVE-2026-43359

MEDIUM EPSS 2.4%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-191

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥3.12  –  <6.1.167
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be
    Patch