CVE-2025-71237

MEDIUM EPSS 2.0%
Published Feb 18, 20264mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 18, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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]

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥3.15  –  <5.10.251
linuxlinux_kernel*≥5.11  –  <5.15.201
linuxlinux_kernel*≥5.16  –  <6.1.164
linuxlinux_kernel*≥6.2  –  <6.6.125
linuxlinux_kernel*≥6.7  –  <6.12.72
linuxlinux_kernel*≥6.13  –  <6.18.11
linuxlinux_kernel*≥6.19  –  <6.19.1

References 8

  • git.kernel.org https://git.kernel.org/stable/c/2438982f635e6cc2009be68ba2efb2998727d8d4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4aa45f841413cca81882602b4042c53502f34cad
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6457d3ee41a4c15082ac49c5aa7fb933b4a043f3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8c5ee234bd54f1447c846101fdaef2cf70c2149
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/df1e20796c9f3d541cca47fb72e4369ea135642d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ea2278657ad0d62596589fbe2caf995e189e65e7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed527ef0c264e4bed6c7b2a158ddf516b17f5f66
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2438982f635e6cc2009be68ba2efb2998727d8d4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4aa45f841413cca81882602b4042c53502f34cad
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6457d3ee41a4c15082ac49c5aa7fb933b4a043f3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8c5ee234bd54f1447c846101fdaef2cf70c2149
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba18e5f22f26aa4ef78bc3e81f639d1d4f3845e6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/df1e20796c9f3d541cca47fb72e4369ea135642d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ea2278657ad0d62596589fbe2caf995e189e65e7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ed527ef0c264e4bed6c7b2a158ddf516b17f5f66
    Patch