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7.1
HIGH CVSS 3.1
CVE-2025-38677
f2fs: fix to avoid out-of-boundary access in dnode page
Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in dnode page As Jiaming Zhang reported: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data().

INFO

Published Date :

Aug. 30, 2025, 10:15 a.m.

Last Modified :

Jan. 8, 2026, 10:30 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-38677 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
1 Debian debian_linux
: Total Affected Vendor : 2 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH [email protected]
Solution
Apply kernel patch to add sanity check for node ID to prevent out-of-boundary access.
  • Update the Linux kernel.
  • Apply the provided patch.
  • Recompile the kernel.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-38677.

URL Resource
https://git.kernel.org/stable/c/6b7784ea07e6aa044f74b39d6b5af5e28746fc81 Patch
https://git.kernel.org/stable/c/77de19b6867f2740cdcb6c9c7e50d522b47847a4 Patch
https://git.kernel.org/stable/c/888aa660144bcb6ec07839da756ee46bfcf7fc53 Patch
https://git.kernel.org/stable/c/901f62efd6e855f93d8b1175540f29f4dc45ba55 Patch
https://git.kernel.org/stable/c/92ef491b506a0f4dd971a3a76f86f2d8f5370180 Patch
https://git.kernel.org/stable/c/a650654365c57407413e9b1f6ff4d539bf2e99ca Patch
https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889a Patch
https://git.kernel.org/stable/c/f1d5093d9fe9f3c74c123741c88666cc853b79c5 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-38677 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-38677 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-38677 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-38677 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jan. 08, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
    Added CWE CWE-125
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.103 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.190 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.241 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.44 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.16.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.8 up to (excluding) 5.4.297 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.149
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/6b7784ea07e6aa044f74b39d6b5af5e28746fc81 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/77de19b6867f2740cdcb6c9c7e50d522b47847a4 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/888aa660144bcb6ec07839da756ee46bfcf7fc53 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/901f62efd6e855f93d8b1175540f29f4dc45ba55 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/92ef491b506a0f4dd971a3a76f86f2d8f5370180 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a650654365c57407413e9b1f6ff4d539bf2e99ca Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889a Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f1d5093d9fe9f3c74c123741c88666cc853b79c5 Types: Patch
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Types: Third Party Advisory
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Types: Third Party Advisory
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Added Reference https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 30, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in dnode page As Jiaming Zhang reported: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data().
    Added Reference https://git.kernel.org/stable/c/6b7784ea07e6aa044f74b39d6b5af5e28746fc81
    Added Reference https://git.kernel.org/stable/c/77de19b6867f2740cdcb6c9c7e50d522b47847a4
    Added Reference https://git.kernel.org/stable/c/888aa660144bcb6ec07839da756ee46bfcf7fc53
    Added Reference https://git.kernel.org/stable/c/901f62efd6e855f93d8b1175540f29f4dc45ba55
    Added Reference https://git.kernel.org/stable/c/92ef491b506a0f4dd971a3a76f86f2d8f5370180
    Added Reference https://git.kernel.org/stable/c/a650654365c57407413e9b1f6ff4d539bf2e99ca
    Added Reference https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889a
    Added Reference https://git.kernel.org/stable/c/f1d5093d9fe9f3c74c123741c88666cc853b79c5
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact