# CVE-2022-48658: linux: In the Linux kernel, the following vulnerability has been resolved:  mm: slub: fix flush_cpu_slab()/__free_slab() inv...

CVE-2022-48658 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48658, released April 28, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48658
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0067
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 28, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.  Commit 5a836bf6b09f ("mm: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context") moved all flush_cpu_slab() invocations to the global workqueue to avoid a problem related with deactivate_slab()/__free_slab() being called from an IRQ context on PREEMPT_RT kernels.  When the flush_all_cpu_locked() function is called from a task context it may happen that a workqueue with WQ_MEM_RECLAIM bit set ends up flushing the global workqueue, this will cause a dependency issue.   workqueue: WQ_MEM_RECLAIM nvme-delete-wq:nvme_delete_ctrl_work [nvme_core]    is flushing !WQ_MEM_RECLAIM events:flush_cpu_slab  WARNING: CPU: 37 PID: 410 at kernel/workqueue.c:2637    check_flush_dependency+0x10a/0x120  Workqueue: nvme-delete-wq nvme_delete_ctrl_work [nvme_core]  RIP: 0010:check_flush_dependency+0x10a/0x120[  453.262125] Call Trace:  __flush_work.isra.0+0xbf/0x220  ? __queue_work+0x1dc/0x420  flush_all_cpus_locked+0xfb/0x120  __kmem_cache_shutdown+0x2b/0x320  kmem_cache_destroy+0x49/0x100  bioset_exit+0x143/0x190  blk_release_queue+0xb9/0x100  kobject_cleanup+0x37/0x130  nvme_fc_ctrl_free+0xc6/0x150 [nvme_fc]  nvme_free_ctrl+0x1ac/0x2b0 [nvme_core]  Fix this bug by creating a workqueue for the flush operation with the WQ_MEM_RECLAIM bit set.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-48658](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48658.md) | Apr 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-48658](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48658.md) | Apr 28, 2024 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-48658](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48658.md) | Apr 28, 2024 |

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