{"cve":"CVE-2023-52910","nvd":{"published":"2024-08-21T07:15:06.910","modified":"2026-08-04T10:18:48.597","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/iova: Fix alloc iova overflows issue\n\nIn __alloc_and_insert_iova_range, there is an issue that retry_pfn\noverflows. The value of iovad->anchor.pfn_hi is ~0UL, then when\niovad->cached_node is iovad->anchor, curr_iova->pfn_hi + 1 will\noverflow. As a result, if the retry logic is executed, low_pfn is\nupdated to 0, and then new_pfn < low_pfn returns false to make the\nallocation successful.\n\nThis issue occurs in the following two situations:\n1. The first iova size exceeds the domain size. When initializing\niova domain, iovad->cached_node is assigned as iovad->anchor. For\nexample, the iova domain size is 10M, start_pfn is 0x1_F000_0000,\nand the iova size allocated for the first time is 11M. The\nfollowing is the log information, new->pfn_lo is smaller than\niovad->cached_node.\n\nExample log as follows:\n[  223.798112][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range\nstart_pfn:0x1f0000,retry_pfn:0x0,size:0xb00,limit_pfn:0x1f0a00\n[  223.799590][T1705487] sh: [name:iova&]__alloc_and_insert_iova_range\nsuccess start_pfn:0x1f0000,new->pfn_lo:0x1efe00,new->pfn_hi:0x1f08ff\n\n2. The node with the largest iova->pfn_lo value in the iova domain\nis deleted, iovad->cached_node will be updated to iovad->anchor,\nand then the alloc iova size exceeds the maximum iova size that can\nbe allocated in the domain.\n\nAfter judging that retry_pfn is less than limit_pfn, call retry_pfn+1\nto fix the overflow issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/61cbf790e7329ed78877560be7136f0b911bba7f","https://git.kernel.org/stable/c/c929a230c84441e400c32e7b7b4ab763711fb63e","https://git.kernel.org/stable/c/dcdb3ba7e2a8caae7bfefd603bc22fd0ce9a389c"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:54:16.205165117+00:00"},"epss":{"cve":"CVE-2023-52910","score":0.00245,"percentile":0.15793,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}