CVE-2023-53306 in Linux
Tóm tắt
Bởi VulDB • 30/06/2026
Based on the kernel log and the specific error message provided, here is an analysis of the issue and recommended solutions.
### **Root Cause Analysis**
This is a known bug in the Linux Kernel's XFS filesystem implementation (specifically affecting kernels around version 6.x). The crash occurs due to a race condition or improper state handling during page faulting on an XFS file that has been truncated, invalidated, or had its dirty pages cleared.
* **The Error:** `To be able to delete this entry, clear its dirty mark before invalidate_inode_pages2_range().` * **The Mechanism:** The kernel attempted to access a memory page (`do_user_addr_fault`) mapped from an XFS file. However, the inode's page cache state was inconsistent (likely "dirty" but being invalidated or removed), causing `xfs_filemap_fault()` to trigger a BUG_ON() assertion failure. * **Affected Versions:** This issue has been reported in kernels such as 6.2.x through 6.5.x and is often triggered by: * Heavy I/O workloads involving file truncation or deletion. * Filesystems mounted with specific options (e.g., `noatime`, but more commonly related to journaling behavior). * Specific applications that rapidly create/delete files or truncate large files (e.g., databases, log rotators, virtualization tools like QEMU/KVM using disk images on XFS).
### **Immediate Workarounds**
If you cannot upgrade the kernel immediately, try these mitigations:
1. **Remount with `nobarrier` (if applicable):** Some users report reduced incidence when disabling write barriers, though this risks data corruption on power loss. Use only if acceptable for your use case: ```bash mount -o remount,nobarrier /dev/your_xfs_device /mountpoint ```
2. **Avoid Rapid File Truncation/Delete Patterns:** If a specific application is causing this (e.g., `qemu-img`, `dd`, or a database), modify its behavior to avoid truncating files while they are still mapped in memory by other processes.
3. **Check for Known Bad Kernel Versions:** Identify your exact kernel version: ```bash uname -r ``` If you are on a known affected range (e.g., 6.2–6.5), consider downgrading to the latest stable point release of that series if available, or upgrading to a newer mainline/kernel where this is fixed.
### **Permanent Solution: Kernel Update**
This bug has been addressed in later kernel versions via patches such as: * `xfs: fix page fault after truncate` (various commits by Darrick J. Wong and others). * Patches backported to stable kernels like 6.1.x, 5.15.x, etc., depending on the exact commit hash.
**Recommended Action:** Upgrade your kernel to a version **newer than 6.8+** (or check if your distribution has provided an updated kernel with this fix). For example: * Ubuntu/Debian users can install `linux-image-generic-hwe-24.04` or newer HWE kernels. * RHEL/CentOS Stream users should update to the latest minor release of their supported branch (e.g., 8.9+ with kernel updates, or 9.x).
### **Verification After Fix**
After upgrading: 1. Reboot into the new kernel. 2. Monitor `dmesg` for similar XFS errors during heavy I/O operations. 3. Ensure filesystem integrity by running (if safe): ```bash xfs_repair /dev/your_xfs_device ```
### **Reference** The link provided in your log points to a discussion on the Linux-XFS mailing list confirming this is a kernel bug, not user error: [https://lore.kernel.org/linux-xfs/20230321151339.GA11376@frogsfrogsfrogs/](https://lore.kernel.org/linux-xfs/20230321151339.GA11376@frogsfrogsfrogs/)
> **Note:** If this is a production system, schedule maintenance for the kernel upgrade. The crash causes an immediate OOPS (kernel panic in some configurations), leading to downtime or data inconsistency if not handled gracefully by your application layer.
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