CVE-2025-40233 Affecting kernel-docs-html package, versions <6.12.0-160000.9.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.05% (17th percentile)

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  • Snyk IDSNYK-SLES1600-KERNELDOCSHTML-15239435
  • published6 Feb 2026
  • disclosed2 Feb 2026

Introduced: 2 Feb 2026

NewCVE-2025-40233  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 kernel-docs-html to version 6.12.0-160000.9.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-docs-html package and not the kernel-docs-html package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

ocfs2: clear extent cache after moving/defragmenting extents

The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags. This triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters().

The problem occurs when:

  1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED
  2. ioctl(FITRIM) triggers ocfs2_move_extents()
  3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2)
  4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent() which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0)
  5. The extent map cache is not invalidated after the move
  6. Later write() operations read stale cached flags (0x2) but disk has updated flags (0x0), causing a mismatch
  7. BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) triggers

Fix by clearing the extent map cache after each extent move/defrag operation in __ocfs2_move_extents_range(). This ensures subsequent operations read fresh extent data from disk.

CVSS Base Scores

version 3.1