# CVE-2023-52910: linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/iova: Fix alloc iova overflows issue  In _...

CVE-2023-52910 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52910, released August 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52910
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- 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:  iommu/iova: Fix alloc iova overflows issue  In __alloc_and_insert_iova_range, there is an issue that retry_pfn overflows. The value of iovad->anchor.pfn_hi is ~0UL, then when iovad->cached_node is iovad->anchor, curr_iova->pfn_hi + 1 will overflow. As a result, if the retry logic is executed, low_pfn is updated to 0, and then new_pfn < low_pfn returns false to make the allocation successful.  This issue occurs in the following two situations: 1. The first iova size exceeds the domain size. When initializing iova domain, iovad->cached_node is assigned as iovad->anchor. For example, the iova domain size is 10M, start_pfn is 0x1_F000_0000, and the iova size allocated for the first time is 11M. The following is the log information, new->pfn_lo is smaller than iovad->cached_node.  Example log as follows: [  223.798112][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range start_pfn:0x1f0000,retry_pfn:0x0,size:0xb00,limit_pfn:0x1f0a00 [  223.799590][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range success start_pfn:0x1f0000,new->pfn_lo:0x1efe00,new->pfn_hi:0x1f08ff  2. The node with the largest iova->pfn_lo value in the iova domain is deleted, iovad->cached_node will be updated to iovad->anchor, and then the alloc iova size exceeds the maximum iova size that can be allocated in the domain.  After judging that retry_pfn is less than limit_pfn, call retry_pfn+1 to fix the overflow issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.7-1 | [DEBIAN-CVE-2023-52910](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52910.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.7-1 | [DEBIAN-CVE-2023-52910](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52910.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.7-1 | [DEBIAN-CVE-2023-52910](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52910.md) | Aug 21, 2024 |

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