{"cve":"CVE-2023-53777","nvd":{"published":"2025-12-09T01:16:48.753","modified":"2026-06-17T06:46:03.310","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: kill hooked chains to avoid loops on deduplicated compressed images\n\nAfter heavily stressing EROFS with several images which include a\nhand-crafted image of repeated patterns for more than 46 days, I found\ntwo chains could be linked with each other almost simultaneously and\nform a loop so that the entire loop won't be submitted.  As a\nconsequence, the corresponding file pages will remain locked forever.\n\nIt can be _only_ observed on data-deduplicated compressed images.\nFor example, consider two chains with five pclusters in total:\n\tChain 1:  2->3->4->5    -- The tail pcluster is 5;\n        Chain 2:  5->1->2       -- The tail pcluster is 2.\n\nChain 2 could link to Chain 1 with pcluster 5; and Chain 1 could link\nto Chain 2 at the same time with pcluster 2.\n\nSince hooked chains are all linked locklessly now, I have no idea how\nto simply avoid the race.  Instead, let's avoid hooked chains completely\nuntil I could work out a proper way to fix this and end users finally\ntell us that it's needed to add it back.\n\nActually, this optimization can be found with multi-threaded workloads\n(especially even more often on deduplicated compressed images), yet I'm\nnot sure about the overall system impacts of not having this compared\nwith implementation complexity.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/10c2b98a40d9044a3e97f4697ca6213bad7e19c2","https://git.kernel.org/stable/c/967c28b23f6c89bb8eef6a046ea88afe0d7c1029","https://git.kernel.org/stable/c/b5b0d52f00e4bacb0ebdf47cd7016b0485fffad2","https://git.kernel.org/stable/c/d3b39ea24835ac03da1a30f93ae7c05d55a40191"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2023-53777","score":0.00199,"percentile":0.09798,"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."]}