# CVE-2022-48867: linux: In the Linux kernel, the following vulnerability has been resolved:  dmaengine: idxd: Prevent use after free on compl...

CVE-2022-48867 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48867, released August 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48867
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  dmaengine: idxd: Prevent use after free on completion memory  On driver unload any pending descriptors are flushed at the time the interrupt is freed: idxd_dmaengine_drv_remove() -> 	drv_disable_wq() -> 		idxd_wq_free_irq() -> 			idxd_flush_pending_descs().  If there are any descriptors present that need to be flushed this flow triggers a "not present" page fault as below:   BUG: unable to handle page fault for address: ff391c97c70c9040  #PF: supervisor read access in kernel mode  #PF: error_code(0x0000) - not-present page  The address that triggers the fault is the address of the descriptor that was freed moments earlier via: drv_disable_wq()->idxd_wq_free_resources()  Fix the use after free by freeing the descriptors after any possible usage. This is done after idxd_wq_reset() to ensure that the memory remains accessible during possible completion writes by the device.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.8-1 | [DEBIAN-CVE-2022-48867](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48867.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.8-1 | [DEBIAN-CVE-2022-48867](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48867.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.8-1 | [DEBIAN-CVE-2022-48867](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48867.md) | Aug 21, 2024 |

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