CVE-2025-38222— ext4: inline: fix len overflow in ext4_prepare_inline_data
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ext4_prepare_inline_data函数中len参数类型不当，可能导致整数溢出。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f19d5870cbf72d4cb2a8e1f749dff97af99b071e< d3dfc60efd145df5324b99a244b0b05505cde29b |
affected |
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< 717414a8c083c376d4a8940a1230fe0c6ed4ee00 |
affected | ||
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< 9d1d1c5bf4fc1af76be154d3afb2acdbd89ec7d8 |
affected | ||
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< cf5f319a2d8ab8238f8cf3a19463b9bff6420934 |
affected | ||
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< 26e09d18599da0adc543eabd300080daaeda6869 |
affected | ||
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< 5766da2237e539f259aa0e5f3639ae37b44ca458 |
affected | ||
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< e80ee0263d88d77f2fd1927f915003a7066cbb50 |
affected | ||
f19d5870cbf72d4cb2a8e1f749dff97af99b071e< 227cb4ca5a6502164f850d22aec3104d7888b270 |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2025-38222
Vulnerability Information
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Vulnerability Title
ext4: inline: fix len overflow in ext4_prepare_inline_data
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: inline: fix len overflow in ext4_prepare_inline_data
When running the following code on an ext4 filesystem with inline_data
feature enabled, it will lead to the bug below.
fd = open("file1", O_RDWR | O_CREAT | O_TRUNC, 0666);
ftruncate(fd, 30);
pwrite(fd, "a", 1, (1UL << 40) + 5UL);
That happens because write_begin will succeed as when
ext4_generic_write_inline_data calls ext4_prepare_inline_data, pos + len
will be truncated, leading to ext4_prepare_inline_data parameter to be 6
instead of 0x10000000006.
Then, later when write_end is called, we hit:
BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
at ext4_write_inline_data.
Fix it by using a loff_t type for the len parameter in
ext4_prepare_inline_data instead of an unsigned int.
[ 44.545164] ------------[ cut here ]------------
[ 44.545530] kernel BUG at fs/ext4/inline.c:240!
[ 44.545834] Oops: invalid opcode: 0000 [#1] SMP NOPTI
[ 44.546172] CPU: 3 UID: 0 PID: 343 Comm: test Not tainted 6.15.0-rc2-00003-g9080916f4863 #45 PREEMPT(full) 112853fcebfdb93254270a7959841d2c6aa2c8bb
[ 44.546523] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 44.546523] RIP: 0010:ext4_write_inline_data+0xfe/0x100
[ 44.546523] Code: 3c 0e 48 83 c7 48 48 89 de 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e4 fa 43 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 0f 0b <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 49
[ 44.546523] RSP: 0018:ffffb342008b79a8 EFLAGS: 00010216
[ 44.546523] RAX: 0000000000000001 RBX: ffff9329c579c000 RCX: 0000010000000006
[ 44.546523] RDX: 000000000000003c RSI: ffffb342008b79f0 RDI: ffff9329c158e738
[ 44.546523] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
[ 44.546523] R10: 00007ffffffff000 R11: ffffffff9bd0d910 R12: 0000006210000000
[ 44.546523] R13: fffffc7e4015e700 R14: 0000010000000005 R15: ffff9329c158e738
[ 44.546523] FS: 00007f4299934740(0000) GS:ffff932a60179000(0000) knlGS:0000000000000000
[ 44.546523] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 44.546523] CR2: 00007f4299a1ec90 CR3: 0000000002886002 CR4: 0000000000770eb0
[ 44.546523] PKRU: 55555554
[ 44.546523] Call Trace:
[ 44.546523] <TASK>
[ 44.546523] ext4_write_inline_data_end+0x126/0x2d0
[ 44.546523] generic_perform_write+0x17e/0x270
[ 44.546523] ext4_buffered_write_iter+0xc8/0x170
[ 44.546523] vfs_write+0x2be/0x3e0
[ 44.546523] __x64_sys_pwrite64+0x6d/0xc0
[ 44.546523] do_syscall_64+0x6a/0xf0
[ 44.546523] ? __wake_up+0x89/0xb0
[ 44.546523] ? xas_find+0x72/0x1c0
[ 44.546523] ? next_uptodate_folio+0x317/0x330
[ 44.546523] ? set_pte_range+0x1a6/0x270
[ 44.546523] ? filemap_map_pages+0x6ee/0x840
[ 44.546523] ? ext4_setattr+0x2fa/0x750
[ 44.546523] ? do_pte_missing+0x128/0xf70
[ 44.546523] ? security_inode_post_setattr+0x3e/0xd0
[ 44.546523] ? ___pte_offset_map+0x19/0x100
[ 44.546523] ? handle_mm_fault+0x721/0xa10
[ 44.546523] ? do_user_addr_fault+0x197/0x730
[ 44.546523] ? do_syscall_64+0x76/0xf0
[ 44.546523] ? arch_exit_to_user_mode_prepare+0x1e/0x60
[ 44.546523] ? irqentry_exit_to_user_mode+0x79/0x90
[ 44.546523] entry_SYSCALL_64_after_hwframe+0x55/0x5d
[ 44.546523] RIP: 0033:0x7f42999c6687
[ 44.546523] Code: 48 89 fa 4c 89 df e8 58 b3 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[ 44.546523] RSP: 002b:00007ffeae4a7930 EFLAGS: 00000202 ORIG_RAX: 0000000000000012
[ 44.546523] RAX: ffffffffffffffda RBX: 00007f4299934740 RCX: 00007f42999c6687
[ 44.546523] RDX: 0000000000000001 RSI: 000055ea6149200f RDI: 0000000000000003
[ 44.546523] RBP: 00007ffeae4a79a0 R08: 0000000000000000 R09: 0000000000000000
[ 44.546523] R10: 0000010000000005 R11: 0000000000000202 R12: 0000
---truncated---
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ext4_prepare_inline_data函数中len参数类型不当，可能导致整数溢出。
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
II. Public POCs for CVE-2025-38222
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|---|
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Patches & Fixes for CVE-2025-38222 (1)
Same Patch Batch · Linux · 2025-07-04 · 59 CVEs total
| CVE-2025-38209 | 9.8 CRITICAL | nvme-tcp: remove tag set when second admin queue config fails |
| CVE-2025-38211 | 9.8 CRITICAL | RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction |
| CVE-2025-38174 | 8.8 HIGH | thunderbolt: Do not double dequeue a configuration request |
| CVE-2025-38216 | 8.8 HIGH | iommu/vt-d: Restore context entry setup order for aliased devices |
| CVE-2025-38233 | 7.8 HIGH | powerpc64/ftrace: fix clobbered r15 during livepatching |
| CVE-2025-38230 | 7.8 HIGH | jfs: validate AG parameters in dbMount() to prevent crashes |
| CVE-2025-38227 | 7.8 HIGH | media: vidtv: Terminating the subsequent process of initialization failure |
| CVE-2025-38226 | 7.8 HIGH | media: vivid: Change the siize of the composing |
| CVE-2025-38224 | 7.8 HIGH | can: kvaser_pciefd: refine error prone echo_skb_max handling logic |
| CVE-2025-38218 | 7.8 HIGH | f2fs: fix to do sanity check on sit_bitmap_size |
| CVE-2025-38232 | 7.8 HIGH | NFSD: fix race between nfsd registration and exports_proc |
| CVE-2025-38212 | 7.8 HIGH | ipc: fix to protect IPCS lookups using RCU |
| CVE-2025-38175 | 7.8 HIGH | binder: fix yet another UAF in binder_devices |
| CVE-2025-38234 | 7.8 HIGH | sched/rt: Fix race in push_rt_task |
| CVE-2025-38206 | 7.8 HIGH | exfat: fix double free in delayed_free |
| CVE-2025-38204 | 7.8 HIGH | jfs: fix array-index-out-of-bounds read in add_missing_indices |
| CVE-2025-38192 | 7.8 HIGH | net: clear the dst when changing skb protocol |
| CVE-2025-38187 | 7.8 HIGH | drm/nouveau: fix a use-after-free in r535_gsp_rpc_push() |
| CVE-2025-38184 | 7.8 HIGH | tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer |
| CVE-2025-38180 | 7.8 HIGH | net: atm: fix /proc/net/atm/lec handling |
Showing top 20 of 59 CVEs. View all on vendor page → →
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V. Comments for CVE-2025-38222
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