CVE-2022-50507 in Linux
Sumário
de VulDB • 01/06/2026
Based on the kernel stack trace provided, here is an analysis of the issue:
### **Summary** The system crashed (or triggered a kernel warning/oops) while attempting to **mount an NTFS filesystem**. The crash occurred deep within the VFS (Virtual File System) layer during the `get_tree_bdev` call, which is responsible for getting the superblock for a block device.
### **Key Stack Trace Analysis** 1. **`__x64_sys_mount` / `do_mount` / `path_mount`**: * A user-space process called the `mount` system call (syscall `0xa5` as seen in `ORIG_RAX`). * This is a standard mount operation initiated from userspace.
2. **`vfs_get_tree`**: * The VFS layer is trying to get the filesystem tree (superblock) for the mounted filesystem.
3. **`ntfs_fs_get_tree`**: * The specific filesystem driver involved is **NTFS** (`ntfs_fs_get_tree`). * This confirms the target filesystem is NTFS.
4. **`get_tree_bdev`**: * This is where the crash/oops occurred. `get_tree_bdev` is a helper function used by block-device-based filesystems (like NTFS, ext4, etc.) to get the superblock from a block device. * The crash likely happened inside `get_tree_bdev` or one of its callees (not fully shown in the trace, but the RIP points to the syscall entry, meaning the crash happened *before* returning from the syscall, likely in the kernel thread handling the mount).
5. **`RIP: 0x7fd0d1ce948a`**: * This is a **userspace address** (starts with `0x7f...`), which is unusual for a kernel crash trace. However, note that the `RIP` shown here is likely the **return address** or the instruction pointer at the time the crash was *detected* or *logged*, not necessarily the exact instruction that caused the fault. In many kernel oops reports, the `RIP` field can sometimes point to the userspace caller if the crash happened in a context where the kernel was returning to userspace, or it might be a misinterpretation of the trace format. More importantly, the **call stack** clearly shows the kernel path.
6. **`RAX: ffffffffffffffda`**: * This is a negative error code in two's complement: `-22` (`-EINVAL`, Invalid argument). This suggests that the mount operation failed with an invalid argument error, which might have triggered a BUG_ON or a panic if not handled correctly, or it's just the return value being logged.
### **Possible Causes** 1. **Corrupted NTFS Filesystem**: The NTFS filesystem on the target device might be corrupted, causing the `ntfs_fs_get_tree` function to encounter an unexpected state. 2. **Invalid Mount Options**: The mount command might have passed invalid options that the NTFS driver doesn't handle well. 3. **Kernel Bug in NTFS Driver**: There might be a bug in the `ntfs` driver's `get_tree_bdev` handling, especially if the block device is in an unusual state (e.g., removed, locked, or misconfigured). 4. **Hardware Issue**: Faulty storage media causing read errors during superblock retrieval.
### **Recommendations** 1. **Check dmesg for More Context**: * Look for earlier messages in `dmesg` that might indicate why the mount failed (e.g., "NTFS: error reading superblock", "NTFS: invalid MFT record", etc.). * Search for any `BUG:`, `WARNING:`, or `Oops:` messages around the timestamp `[82.95...]`.
2. **Verify the NTFS Filesystem**: * If possible, run `ntfsfix` (from `ntfs-3g` tools) on the device to check and repair minor NTFS issues. * Example: `sudo ntfsfix /dev/sdXN` (replace `sdXN` with the actual device).
3. **Check Mount Options**: * Ensure the mount command is using valid options. Try mounting without any special options first.
4. **Update Kernel/Drivers**: * If this is a known bug, check if there is a newer kernel version or a patch for the `ntfs` driver.
5. **Hardware Diagnostics**: * Run SMART tests on the storage device to rule out hardware
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