# CVE-2022-48674: linux: In the Linux kernel, the following vulnerability has been resolved:  erofs: fix pcluster use-after-free on UP platfor...

CVE-2022-48674 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48674, released May 3, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48674
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 3, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  erofs: fix pcluster use-after-free on UP platforms  During stress testing with CONFIG_SMP disabled, KASAN reports as below:  ================================================================== BUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30 Read of size 8 at addr ffff8881094223f8 by task stress/7789  CPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Call Trace:  <TASK> ..  __mutex_lock+0xe5/0xc30 ..  z_erofs_do_read_page+0x8ce/0x1560 ..  z_erofs_readahead+0x31c/0x580 .. Freed by task 7787  kasan_save_stack+0x1e/0x40  kasan_set_track+0x20/0x30  kasan_set_free_info+0x20/0x40  __kasan_slab_free+0x10c/0x190  kmem_cache_free+0xed/0x380  rcu_core+0x3d5/0xc90  __do_softirq+0x12d/0x389  Last potentially related work creation:  kasan_save_stack+0x1e/0x40  __kasan_record_aux_stack+0x97/0xb0  call_rcu+0x3d/0x3f0  erofs_shrink_workstation+0x11f/0x210  erofs_shrink_scan+0xdc/0x170  shrink_slab.constprop.0+0x296/0x530  drop_slab+0x1c/0x70  drop_caches_sysctl_handler+0x70/0x80  proc_sys_call_handler+0x20a/0x2f0  vfs_write+0x555/0x6c0  ksys_write+0xbe/0x160  do_syscall_64+0x3b/0x90  The root cause is that erofs_workgroup_unfreeze() doesn't reset to orig_val thus it causes a race that the pcluster reuses unexpectedly before freeing.  Since UP platforms are quite rare now, such path becomes unnecessary. Let's drop such specific-designed path directly instead.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.19.11-1 | [DEBIAN-CVE-2022-48674](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48674.md) | May 3, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.19.11-1 | [DEBIAN-CVE-2022-48674](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48674.md) | May 3, 2024 |
| Linux | linux Debian 14 | 5.19.11-1 | [DEBIAN-CVE-2022-48674](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48674.md) | May 3, 2024 |

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