CVE-2025-68251 (GCVE-0-2025-68251)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:32 – Updated: 2025-12-16 14:32
VLAI?
Title
erofs: avoid infinite loops due to corrupted subpage compact indexes
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: avoid infinite loops due to corrupted subpage compact indexes Robert reported an infinite loop observed by two crafted images. The root cause is that `clusterofs` can be larger than `lclustersize` for !NONHEAD `lclusters` in corrupted subpage compact indexes, e.g.: blocksize = lclustersize = 512 lcn = 6 clusterofs = 515 Move the corresponding check for full compress indexes to `z_erofs_load_lcluster_from_disk()` to also cover subpage compact compress indexes. It also fixes the position of `m->type >= Z_EROFS_LCLUSTER_TYPE_MAX` check, since it should be placed right after `z_erofs_load_{compact,full}_lcluster()`.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea , < 8675447a8794983f2b7e694b378112772c17635e (git)
Affected: 8d2517aaeea3ab8651bb517bca8f3c8664d318ea , < e13d315ae077bb7c3c6027cc292401bc0f4ec683 (git)
Affected: 3f691aa676f29586e83e6c032713554a290418c3 (git)
Affected: 22438a34d383ec2789eaf450728e38abc53051f8 (git)
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    Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: avoid infinite loops due to corrupted subpage compact indexes\n\nRobert reported an infinite loop observed by two crafted images.\n\nThe root cause is that `clusterofs` can be larger than `lclustersize`\nfor !NONHEAD `lclusters` in corrupted subpage compact indexes, e.g.:\n\n  blocksize = lclustersize = 512   lcn = 6   clusterofs = 515\n\nMove the corresponding check for full compress indexes to\n`z_erofs_load_lcluster_from_disk()` to also cover subpage compact\ncompress indexes.\n\nIt also fixes the position of `m-\u003etype \u003e= Z_EROFS_LCLUSTER_TYPE_MAX`\ncheck, since it should be placed right after\n`z_erofs_load_{compact,full}_lcluster()`."
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    "dateReserved": "2025-12-16T13:41:40.266Z",
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}


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