# CVE-2022-48862: linux: In the Linux kernel, the following vulnerability has been resolved:  vhost: fix hung thread due to erroneous iotlb en...

CVE-2022-48862 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48862, released July 16, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48862
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  vhost: fix hung thread due to erroneous iotlb entries  In vhost_iotlb_add_range_ctx(), range size can overflow to 0 when start is 0 and last is ULONG_MAX. One instance where it can happen is when userspace sends an IOTLB message with iova=size=uaddr=0 (vhost_process_iotlb_msg). So, an entry with size = 0, start = 0, last = ULONG_MAX ends up in the iotlb. Next time a packet is sent, iotlb_access_ok() loops indefinitely due to that erroneous entry.  	Call Trace: 	 <TASK> 	 iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340 	 vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366 	 vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104 	 vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372 	 kthread+0x2e9/0x3a0 kernel/kthread.c:377 	 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 	 </TASK>  Reported by syzbot at: 	https://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87  To fix this, do two things:  1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map    a range with size 0. 2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX]    by splitting it into two entries.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.18-1 | [DEBIAN-CVE-2022-48862](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48862.md) | Jul 16, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.18-1 | [DEBIAN-CVE-2022-48862](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48862.md) | Jul 16, 2024 |
| Linux | linux Debian 14 | 5.16.18-1 | [DEBIAN-CVE-2022-48862](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48862.md) | Jul 16, 2024 |

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