# CVE-2024-42300: linux: In the Linux kernel, the following vulnerability has been resolved:  erofs: fix race in z_erofs_get_gbuf()  In z_erof...

CVE-2024-42300 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42300, released August 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42300
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 17, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  erofs: fix race in z_erofs_get_gbuf()  In z_erofs_get_gbuf(), the current task may be migrated to another CPU between `z_erofs_gbuf_id()` and `spin_lock(&gbuf->lock)`.  Therefore, z_erofs_put_gbuf() will trigger the following issue which was found by stress test:  <2>[772156.434168] kernel BUG at fs/erofs/zutil.c:58! .. <4>[772156.435007] <4>[772156.439237] CPU: 0 PID: 3078 Comm: stress Kdump: loaded Tainted: G            E      6.10.0-rc7+ #2 <4>[772156.439239] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 1.0.0 01/01/2017 <4>[772156.439241] pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) <4>[772156.439243] pc : z_erofs_put_gbuf+0x64/0x70 [erofs] <4>[772156.439252] lr : z_erofs_lz4_decompress+0x600/0x6a0 [erofs] .. <6>[772156.445958] stress (3127): drop_caches: 1 <4>[772156.446120] Call trace: <4>[772156.446121]  z_erofs_put_gbuf+0x64/0x70 [erofs] <4>[772156.446761]  z_erofs_lz4_decompress+0x600/0x6a0 [erofs] <4>[772156.446897]  z_erofs_decompress_queue+0x740/0xa10 [erofs] <4>[772156.447036]  z_erofs_runqueue+0x428/0x8c0 [erofs] <4>[772156.447160]  z_erofs_readahead+0x224/0x390 [erofs] ..

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.3-1 | [DEBIAN-CVE-2024-42300](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42300.md) | Aug 17, 2024 |
| Linux | linux Debian 14 | 6.10.3-1 | [DEBIAN-CVE-2024-42300](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42300.md) | Aug 17, 2024 |

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