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In the Linux kernel, the following vulnerability has been resolved: ocfs2: avoid moving extents to occupied clusters For non-auto OCFS2_IOC_MOVE_EXT… (CVE-2026-72164)

0
Unknown
Published: 08/15/2026 (08/15/2026, 06:32:14 UTC)
Source: GCVE Database

Description

In 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.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-5r4j-cfqp-hv7w
Osv Schema Version
1.4.0
Aliases
["CVE-2026-72164"]
Ecosystems
[]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a808b75bf8831d5394ff7b3

Added to database: 08/15/2026, 15:53:25 UTC

Last updated: 08/15/2026, 15:54:50 UTC

Views: 1

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