Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix buffer_head leak in ext4_init_orphan_info
ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh.
If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped.
This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths.
Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < a9a6ec1298f9bc134b2c5db27d25bb10603b7113; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 35fc83c65faf7949f5701bb34b20f822560a7718; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 74637f7fef030e5fb2e835b7dfeb05efdc48e0fe; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 6ec53ccab0d691b3c73e03d930343ca45987e88d; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 1399f102d8a1855c1a38506057306ec79d0787d9; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < e1e342d9a561c016b8531ec1f4dcefaad9d64954; >= 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37, < 05704335803b69c1bfa8637b7ada942bf2ee8a41 |
| Linux | Linux | 5.15 |
References
- https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41
- https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9
- https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718
- https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d
- https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe
- https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113
- https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954
Timeline
- Published
- Sep 17, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received