# CVE-2021-47554: linux: In the Linux kernel, the following vulnerability has been resolved:  vdpa_sim: avoid putting an uninitialized iova_do...

CVE-2021-47554 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47554, released May 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47554
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  vdpa_sim: avoid putting an uninitialized iova_domain  The system will crash if we put an uninitialized iova_domain, this could happen when an error occurs before initializing the iova_domain in vdpasim_create().  BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0 ... Call Trace:  <TASK>  put_iova_domain+0x29/0x220  vdpasim_free+0xd1/0x120 [vdpa_sim]  vdpa_release_dev+0x21/0x40 [vdpa]  device_release+0x33/0x90  kobject_release+0x63/0x160  vdpasim_create+0x127/0x2a0 [vdpa_sim]  vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net]  vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa]  genl_family_rcv_msg_doit+0x112/0x140  genl_rcv_msg+0xdf/0x1d0  ...  So we must make sure the iova_domain is already initialized before put it.  In addition, we may get the following warning in this case: WARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70  So we must make sure the iova_cache_put() is invoked only if the iova_cache_get() is already invoked. Let's fix it together.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47554](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47554.md) | May 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47554](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47554.md) | May 24, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47554](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47554.md) | May 24, 2024 |

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