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CVE-2025-71237— nilfs2: Fix potential block overflow that cause system hang

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，该漏洞源于计算nblocks时可能发生整数下溢，可能导致系统挂起。

AI Predicted 7.8 Difficulty: Easy EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< 6457d3ee41a4c15082ac49c5aa7fb933b4a043f3 affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6 affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< 2438982f635e6cc2009be68ba2efb2998727d8d4 affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< df1e20796c9f3d541cca47fb72e4369ea135642d affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< ea2278657ad0d62596589fbe2caf995e189e65e7 affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< 4aa45f841413cca81882602b4042c53502f34cad affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< b8c5ee234bd54f1447c846101fdaef2cf70c2149 affected
82e11e857be3ffd2a0a952c9db8aa2379e2b9e44< ed527ef0c264e4bed6c7b2a158ddf516b17f5f66 affected
… +10 more rows
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I. Basic Information for CVE-2025-71237

Vulnerability Information
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Vulnerability Title
nilfs2: Fix potential block overflow that cause system hang
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: Fix potential block overflow that cause system hang When a user executes the FITRIM command, an underflow can occur when calculating nblocks if end_block is too small. Since nblocks is of type sector_t, which is u64, a negative nblocks value will become a very large positive integer. This ultimately leads to the block layer function __blkdev_issue_discard() taking an excessively long time to process the bio chain, and the ns_segctor_sem lock remains held for a long period. This prevents other tasks from acquiring the ns_segctor_sem lock, resulting in the hang reported by syzbot in [1]. If the ending block is too small, typically if it is smaller than 4KiB range, depending on the usage of the segment 0, it may be possible to attempt a discard request beyond the device size causing the hang. Exiting successfully and assign the discarded size (0 in this case) to range->len. Although the start and len values in the user input range are too small, a conservative strategy is adopted here to safely ignore them, which is equivalent to a no-op; it will not perform any trimming and will not throw an error. [1] task:segctord state:D stack:28968 pid:6093 tgid:6093 ppid:2 task_flags:0x200040 flags:0x00080000 Call Trace: rwbase_write_lock+0x3dd/0x750 kernel/locking/rwbase_rt.c:272 nilfs_transaction_lock+0x253/0x4c0 fs/nilfs2/segment.c:357 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2569 [inline] nilfs_segctor_thread+0x6ec/0xe00 fs/nilfs2/segment.c:2684 [ryusuke: corrected part of the commit message about the consequences]
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于计算nblocks时可能发生整数下溢，可能导致系统挂起。
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 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 ~ 6457d3ee41a4c15082ac49c5aa7fb933b4a043f3 -
Linux Linux 3.15 -

II. Public POCs for CVE-2025-71237

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III. Intelligence Information for CVE-2025-71237

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Same Patch Batch · Linux · 2026-02-18 · 31 CVEs total

CVE-2026-23230 8.8 HIGH smb: client: split cached_fid bitfields to avoid shared-byte RMW races
CVE-2026-23226 8.8 HIGH ksmbd: add chann_lock to protect ksmbd_chann_list xarray
CVE-2025-71234 8.8 HIGH wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add
CVE-2026-23227 7.8 HIGH drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to
CVE-2026-23225 7.8 HIGH sched/mmcid: Don't assume CID is CPU owned on mode switch
CVE-2026-23224 7.8 HIGH erofs: fix UAF issue for file-backed mounts w/ directio option
CVE-2026-23222 7.8 HIGH crypto: omap - Allocate OMAP_CRYPTO_FORCE_COPY scatterlists correctly
CVE-2025-71236 7.5 HIGH scsi: qla2xxx: Validate sp before freeing associated memory
CVE-2025-71233 PCI: endpoint: Avoid creating sub-groups asynchronously
CVE-2026-23229 crypto: virtio - Add spinlock protection with virtqueue notification
CVE-2026-23228 smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()
CVE-2026-23223 xfs: fix UAF in xchk_btree_check_block_owner
CVE-2026-23221 bus: fsl-mc: fix use-after-free in driver_override_show()
CVE-2026-23220 ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths
CVE-2025-71235 scsi: qla2xxx: Delay module unload while fabric scan in progress
CVE-2026-23211 mm, swap: restore swap_space attr aviod kernel panic
CVE-2025-71232 scsi: qla2xxx: Free sp in error path to fix system crash
CVE-2025-71231 crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode
CVE-2025-71230 hfs: ensure sb->s_fs_info is always cleaned up
CVE-2025-71229 wifi: rtw88: Fix alignment fault in rtw_core_enable_beacon()

Showing top 20 of 31 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71237

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