GHSA-5R4J-CFQP-HV7W
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
ocfs2: avoid moving extents to occupied clusters
For non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical me_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and expects ocfs2_probe_alloc_group() to replace it with a free run in the target block group.
The probe currently leaves *phys_cpos unchanged if the scan reaches the end of the group without finding a free run. An occupied goal at the last bit can therefore survive the probe and be passed to __ocfs2_move_extent(), which copies file data into a cluster still owned by another inode before the bitmap is updated.
When the probe does find a free run, it also subtracts move_len from the ending bit. The start of an N-bit run ending at i is i - N + 1, so the current calculation can report the bit immediately before the free run.
Clear *phys_cpos before scanning and use the correct free-run start. Callers already treat a zero result as -ENOSPC, so failed probes no longer continue with an occupied caller-controlled goal.
{
"affected": [],
"aliases": [
"CVE-2026-72164"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:21:34Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: avoid moving extents to occupied clusters\n\nFor non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical\nme_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and\nexpects ocfs2_probe_alloc_group() to replace it with a free run in the\ntarget block group.\n\nThe probe currently leaves *phys_cpos unchanged if the scan reaches the\nend of the group without finding a free run. An occupied goal at the last\nbit can therefore survive the probe and be passed to\n__ocfs2_move_extent(), which copies file data into a cluster still owned\nby another inode before the bitmap is updated.\n\nWhen the probe does find a free run, it also subtracts move_len from the\nending bit. The start of an N-bit run ending at i is i - N + 1, so the\ncurrent calculation can report the bit immediately before the free run.\n\nClear *phys_cpos before scanning and use the correct free-run start. \nCallers already treat a zero result as -ENOSPC, so failed probes no longer\ncontinue with an occupied caller-controlled goal.",
"id": "GHSA-5r4j-cfqp-hv7w",
"modified": "2026-08-17T06:33:14Z",
"published": "2026-08-15T06:32:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72164"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19f7b04924b20b81dabbeed19d5542792ba5b6d6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/22920541c35a9f23f219038ba5874c843a7c4419"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3112afebf2a76e522fbaabcbb0c47aafbdc35932"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35486b291b8fbde6c4d0b1c79e565c6260d3329d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4d1953d3aeb4a7f6623083e1839068ee1c157db2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d5d5a21fb33cd9b963aea99da81e4dacd452cd95"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e281d892ce5870a50fdc718cb3bfc3dd5b62c728"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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