EUVD-2026-28665
GHSA-63hq-hrgx-pfwm
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
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.
AnalysisAI
Denial of service via transaction abort in Linux kernel btrfs subsystem when a non-privileged subvolume owner repeatedly calls the set received ioctl with identical UUID values, causing filesystem to transition to read-only mode. The vulnerability exploits insufficient pre-flight validation that allows metadata updates to commence before detecting item overflow conditions, requiring only local access and subvolume ownership rather than root privileges. …
Sign in for full analysis, threat intelligence, and remediation guidance.
More from same product – last 7 days
Command injection in the shell-quote npm package allows attackers who can influence object-token inputs to inject arbitr
Heap buffer overflow in NGINX Plus and NGINX Open Source ngx_http_rewrite_module allows unauthenticated remote attackers
Kernel availability loss in Ubuntu Linux 6.8, 6.17, and 7.0 can be triggered by any unprivileged local user via a defect
Kernel panic via NULL pointer dereference in Ubuntu Linux 6.8's AppArmor notification handler allows a locally authentic
NULL pointer dereference in Ubuntu Linux kernel versions 6.8, 6.17, and 7.0 allows a local unprivileged user to crash th
Vendor StatusVendor
Share
External POC / Exploit Code
Leaving vuln.today