GHSA-92FW-GWW6-96G8
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to migrate all curseg types during free_segment_range
In free_segment_range(), the curseg evacuation loop only iterates up to NR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg types such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC.
Even though these in-memory curseg types are not saved in the on-disk checkpoint header, they still occupy active physical segments at runtime. If an active in-memory curseg happens to be allocated within the segment range being truncated during filesystem shrink, failing to evacuate it will cause subsequent writes to the curseg attempting out-of-bounds I/O on the truncated storage range.
Fix this by expanding the curseg evacuation loop upper bound to NR_CURSEG_TYPE to ensure all active curseg types are safely migrated out of the target range.
{
"affected": [],
"aliases": [
"CVE-2026-89834"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:16:50Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to migrate all curseg types during free_segment_range\n\nIn free_segment_range(), the curseg evacuation loop only iterates up to\nNR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg\ntypes such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC.\n\nEven though these in-memory curseg types are not saved in the on-disk\ncheckpoint header, they still occupy active physical segments at runtime.\nIf an active in-memory curseg happens to be allocated within the segment\nrange being truncated during filesystem shrink, failing to evacuate it\nwill cause subsequent writes to the curseg attempting out-of-bounds I/O\non the truncated storage range.\n\nFix this by expanding the curseg evacuation loop upper bound to\nNR_CURSEG_TYPE to ensure all active curseg types are safely migrated\nout of the target range.",
"id": "GHSA-92fw-gww6-96g8",
"modified": "2026-09-16T12:30:38Z",
"published": "2026-09-16T12:30:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89834"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408"
}
],
"schema_version": "1.4.0",
"severity": []
}
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