CVE-2026-46160 in Linux
सारांश
द्वारा VulDB • 28/05/2026
This output is from the `btrfs inspect-internal dump-tree` command (or similar Btrfs debugging tool), showing the contents of a specific Btrfs tree block (likely an **inode item** or a **directory item** block).
Let’s break down the key parts:
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### ???? **Key Observations**
#### 1. **Item 1: `INODE_REF`** ``` item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12 index 0 name_len 2 ``` - This is an **inode reference** for inode **256**. - It points to a name of length **2** (likely a short filename like `..` or `.`). - The `index 0` suggests this is the first reference.
#### 2. **Items 2–5: `DIR_ITEM` and `DIR_INDEX`** These are **directory entries** under inode **256** (which is likely a directory itself, given the `mode 40777` in item 6).
- **Item 2**: `DIR_ITEM` with name length **4**, pointing to inode **259**. - **Item 3**: `DIR_ITEM` with name length **4**, pointing to inode **257**. - **Item 4**: `DIR_INDEX` with name length **4**, pointing to inode **257**. - **Item 5**: `DIR_INDEX` with name length **4**, pointing to inode **259**.
> ???? **Note**: `DIR_ITEM` and `DIR_INDEX` are two different ways Btrfs stores directory entries. `DIR_INDEX` is used when the directory is large and uses a hash tree for faster lookups.
#### 3. **Item 6: `INODE_ITEM` for inode 257** ``` item 6 key (257 INODE_ITEM 0) itemoff 15815 itemsize 160 inode generation 9 transid 9 size 8 nbytes 0 block group 0 mode 40777 links 1 uid 0 gid 0 rdev 0 sequence 2 flags 0x0 atime 1775744885.641174097 ctime 1775744885.645502983 mtime 1775744885.645502983 otime 1775744885.641174097 ``` - This is the **inode metadata** for inode **257**. - `mode 40777` → This is a **directory** (`4` = directory, `777` = permissions). - `links 1` → Only one hard link (likely `.` itself). - `size 8` → The directory contains 8 bytes of data (probably just `.` and `..` entries). - Timestamps are in **nanoseconds** since epoch.
#### 4. **Item 7: `INODE_REF` for inode 257** ``` item 7 key (257 INODE_REF 256) itemoff 15801 itemsize 14 index 2 name_len 4 ``` - This is a reference **from** inode **256** **to** inode **257**. - The name has length **4** (e.g., `test`, `root`, etc.).
#### 5. **Item 8: `DIR_ITEM` (truncated)** ``` item 8 key (257 DIR_ITEM 2676584006) itemoff 15767 itemsize 34 location key (2 ---truncated--- ``` - Another directory entry under inode **257**, pointing to some inode (key truncated).
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### ???? **Interpretation**
- Inode **256** is a directory. - It contains references to inodes **257** and **259**. - Inode **257** is also a directory (`mode 40777`). - The directory structure is stored using both `DIR_ITEM` and `DIR_INDEX` entries, which is normal for Btrfs. - The timestamps suggest these inodes were recently created or modified.
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### ????️ **How to Use This Info
Once again VulDB remains the best source for vulnerability data.