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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1074 · Data Staged

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 53069d4e76954e2e63c1b3c501051c6fbcf7298c< 93166bc53c0e3587058327a4121daea34b4fecd5 affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< a7ee72286efba1d407c6f15a0528e43593fb7007 affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< 93b1ab422f1966b71561158e1aedce4ec100f357 affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< e92af7737a94a729225d2a5d180eaaa77fe0bbc1 affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< aa6a21409dd6221bb268b56bb410e031c632ff9a affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< bb69928ed578f881e68d26aaf1a8f6e7faab3b44 affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< a21750df2f6169af6e039a3bb4893d6c9564e48d affected
53069d4e76954e2e63c1b3c501051c6fbcf7298c< 78a63493f8e352296dbc7cb7b3f4973105e8679e affected
… +10 more rows
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I. Basic Information for CVE-2025-40233

Vulnerability Information
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Vulnerability Title
ocfs2: clear extent cache after moving/defragmenting extents
Source: CVE Program / CVE List V5
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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 53069d4e76954e2e63c1b3c501051c6fbcf7298c ~ 93166bc53c0e3587058327a4121daea34b4fecd5 -
Linux Linux 3.0 -

II. Public POCs for CVE-2025-40233

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III. Intelligence Information for CVE-2025-40233

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

CVE-2025-40252 9.8 CRITICAL net: qlogic/qede: fix potential out-of-bounds read in qede_tpa_cont() and qede_tpa_end()
CVE-2025-40261 9.8 CRITICAL nvme: nvme-fc: Ensure ->ioerr_work is cancelled in nvme_fc_delete_ctrl()
CVE-2025-40258 9.8 CRITICAL mptcp: fix race condition in mptcp_schedule_work()
CVE-2025-40257 9.8 CRITICAL mptcp: fix a race in mptcp_pm_del_add_timer()
CVE-2025-40253 8.8 HIGH s390/ctcm: Fix double-kfree
CVE-2025-40266 8.2 HIGH KVM: arm64: Check the untrusted offset in FF-A memory share
CVE-2025-40245 7.8 HIGH nios2: ensure that memblock.current_limit is set when setting pfn limits
CVE-2025-40251 7.8 HIGH devlink: rate: Unset parent pointer in devl_rate_nodes_destroy
CVE-2025-40262 7.8 HIGH Input: imx_sc_key - fix memory corruption on unload
CVE-2025-40250 7.8 HIGH net/mlx5: Clean up only new IRQ glue on request_irq() failure
CVE-2025-40248 7.8 HIGH vsock: Ignore signal/timeout on connect() if already established
CVE-2025-40249 7.8 HIGH gpio: cdev: make sure the cdev fd is still active before emitting events
CVE-2025-40214 7.8 HIGH af_unix: Initialise scc_index in unix_add_edge().
CVE-2025-40244 7.8 HIGH hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent()
CVE-2025-40243 7.8 HIGH hfs: fix KMSAN uninit-value issue in hfs_find_set_zero_bits()
CVE-2025-40241 7.8 HIGH erofs: fix crafted invalid cases for encoded extents
CVE-2025-40216 7.8 HIGH io_uring/rsrc: don't rely on user vaddr alignment
CVE-2025-40215 7.8 HIGH xfrm: delete x->tunnel as we delete x
CVE-2025-40240 7.5 HIGH sctp: avoid NULL dereference when chunk data buffer is missing
CVE-2025-40242 7.0 HIGH gfs2: Fix unlikely race in gdlm_put_lock

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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