CVE-2023-53777 (GCVE-0-2023-53777)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-09 00:00
VLAI?
Title
erofs: kill hooked chains to avoid loops on deduplicated compressed images
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: kill hooked chains to avoid loops on deduplicated compressed images After heavily stressing EROFS with several images which include a hand-crafted image of repeated patterns for more than 46 days, I found two chains could be linked with each other almost simultaneously and form a loop so that the entire loop won't be submitted. As a consequence, the corresponding file pages will remain locked forever. It can be _only_ observed on data-deduplicated compressed images. For example, consider two chains with five pclusters in total: Chain 1: 2->3->4->5 -- The tail pcluster is 5; Chain 2: 5->1->2 -- The tail pcluster is 2. Chain 2 could link to Chain 1 with pcluster 5; and Chain 1 could link to Chain 2 at the same time with pcluster 2. Since hooked chains are all linked locklessly now, I have no idea how to simply avoid the race. Instead, let's avoid hooked chains completely until I could work out a proper way to fix this and end users finally tell us that it's needed to add it back. Actually, this optimization can be found with multi-threaded workloads (especially even more often on deduplicated compressed images), yet I'm not sure about the overall system impacts of not having this compared with implementation complexity.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 267f2492c8f71dac44399988b510f9bf6b074a51 , < d3b39ea24835ac03da1a30f93ae7c05d55a40191 (git)
Affected: 267f2492c8f71dac44399988b510f9bf6b074a51 , < b5b0d52f00e4bacb0ebdf47cd7016b0485fffad2 (git)
Affected: 267f2492c8f71dac44399988b510f9bf6b074a51 , < 10c2b98a40d9044a3e97f4697ca6213bad7e19c2 (git)
Affected: 267f2492c8f71dac44399988b510f9bf6b074a51 , < 967c28b23f6c89bb8eef6a046ea88afe0d7c1029 (git)
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    Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.3.13 , ≤ 6.3.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "fs/erofs/zdata.c"
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          "value": "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\u0027t 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-\u003e3-\u003e4-\u003e5    -- The tail pcluster is 5;\n        Chain 2:  5-\u003e1-\u003e2       -- 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\u0027s avoid hooked chains completely\nuntil I could work out a proper way to fix this and end users finally\ntell us that it\u0027s 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\u0027m\nnot sure about the overall system impacts of not having this compared\nwith implementation complexity."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T00:00:32.947Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/d3b39ea24835ac03da1a30f93ae7c05d55a40191"
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          "url": "https://git.kernel.org/stable/c/b5b0d52f00e4bacb0ebdf47cd7016b0485fffad2"
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        },
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          "url": "https://git.kernel.org/stable/c/967c28b23f6c89bb8eef6a046ea88afe0d7c1029"
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      ],
      "title": "erofs: kill hooked chains to avoid loops on deduplicated compressed images",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53777",
    "datePublished": "2025-12-09T00:00:32.947Z",
    "dateReserved": "2025-12-08T23:58:35.271Z",
    "dateUpdated": "2025-12-09T00:00:32.947Z",
    "state": "PUBLISHED"
  },
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53777\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T01:16:48.753\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027t 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-\u003e3-\u003e4-\u003e5    -- The tail pcluster is 5;\\n        Chain 2:  5-\u003e1-\u003e2       -- 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\u0027s avoid hooked chains completely\\nuntil I could work out a proper way to fix this and end users finally\\ntell us that it\u0027s 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\u0027m\\nnot sure about the overall system impacts of not having this compared\\nwith implementation complexity.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10c2b98a40d9044a3e97f4697ca6213bad7e19c2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/967c28b23f6c89bb8eef6a046ea88afe0d7c1029\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5b0d52f00e4bacb0ebdf47cd7016b0485fffad2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3b39ea24835ac03da1a30f93ae7c05d55a40191\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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