Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2025-40233— ocfs2: clear extent cache after moving/defragmenting extents

EPSS 0.04% · P13
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2025-40233

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ocfs2: clear extent cache after moving/defragmenting extents
Source: NVD (National Vulnerability Database)
Vulnerability Description
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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于移动或碎片整理extent后未清除extent缓存，可能导致后续操作看到过时的extent标志。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 53069d4e76954e2e63c1b3c501051c6fbcf7298c ~ 93166bc53c0e3587058327a4121daea34b4fecd5 -
LinuxLinux 3.0 -

II. Public POCs for CVE-2025-40233

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-40233

请登录查看更多情报信息。

Same Patch Batch · Linux · 2025-12-04 · 53 CVEs total

CVE-2025-40229mm/damon/core: fix potential memory leak by cleaning ops_filter in damon_destroy_scheme
CVE-2025-40214af_unix: Initialise scc_index in unix_add_edge().
CVE-2025-40215xfrm: delete x->tunnel as we delete x
CVE-2025-40220fuse: fix livelock in synchronous file put from fuseblk workers
CVE-2025-40217pidfs: validate extensible ioctls
CVE-2025-40218mm/damon/vaddr: do not repeat pte_offset_map_lock() until success
CVE-2025-40219PCI/IOV: Fix race between SR-IOV enable/disable and hotplug
CVE-2025-40216io_uring/rsrc: don't rely on user vaddr alignment
CVE-2025-40227mm/damon/sysfs: dealloc commit test ctx always
CVE-2025-40228mm/damon/sysfs: catch commit test ctx alloc failure
CVE-2025-40226firmware: arm_scmi: Account for failed debug initialization
CVE-2025-40230mm: prevent poison consumption when splitting THP
CVE-2025-40231vsock: fix lock inversion in vsock_assign_transport()
CVE-2025-40232rv: Fully convert enabled_monitors to use list_head as iterator
CVE-2025-40234platform/x86: alienware-wmi-wmax: Fix NULL pointer dereference in sleep handlers
CVE-2025-40236virtio-net: zero unused hash fields
CVE-2025-40235btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()
CVE-2025-40237fs/notify: call exportfs_encode_fid with s_umount
CVE-2025-40238net/mlx5: Fix IPsec cleanup over MPV device
CVE-2025-40239net: phy: micrel: always set shared->phydev for LAN8814

Showing top 20 of 53 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40233

No comments yet

Leave a comment