Medium · published July 25, 2026
In the Linux kernel, the following vulnerability has been resolved:
hfs/hfsplus: zero-initialize buffer in hfs_bnode_read
hfs_bnode_read() can return early without writing to the output buffer
when is_bnode_offset_valid() fails or when check_and_correct_requested_
length() corrects the length to zero. Callers such as hfs_bnode_read_
u16() and hfs_bnode_read_u8() pass stack-allocated buffers and use the
result unconditionally, leading to KMSAN uninit-value reports.
Rather than initializing at each individual call site, zero the buffer
at the start of hfs_bnode_read() before any validation checks. This
ensures all callers in both hfs and hfsplus get a deterministic zero
value regardless of which early-return path is taken.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 5.4.297, < 5.5 | 5.5 |
| linux/linux_kernel | ≥ 5.10.241, < 5.10.261 | 5.10.261 |
| linux/linux_kernel | ≥ 5.15.190, < 5.15.212 | 5.15.212 |
| linux/linux_kernel | ≥ 6.1.149, < 6.1.178 | 6.1.178 |
| linux/linux_kernel | ≥ 6.6.103, < 6.6.145 | 6.6.145 |
| linux/linux_kernel | ≥ 6.12.43, < 6.12.96 | 6.12.96 |
| linux/linux_kernel | ≥ 6.15.11, < 6.16 | 6.16 |
| linux/linux_kernel | ≥ 6.16.2, < 6.18.39 | 6.18.39 |
| linux/linux_kernel | ≥ 6.19, < 7.1.4 | 7.1.4 |