CVE-2025-38677
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-30

Last updated on: 2025-11-03

Assigner: kernel.org

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().
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Meta Information
Published
2025-08-30
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-08-30
EPSS Evaluated
2026-06-14
NVD
CVE-2025-38677
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux kernel 5.10.244-1
linux kernel 6.1.153-1
Helpful Resources
Exploitability
CWE
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a flaw in the Linux kernel's f2fs filesystem where an out-of-boundary memory access can occur due to improper handling of dnode page data. Specifically, a corrupted image can cause a dnode to have the same node ID as its inode, leading the function f2fs_get_dnode_of_data() to incorrectly parse the dnode as an inode node. This results in accessing memory beyond the intended boundary, which can cause system instability or crashes. The fix involves adding a sanity check for node IDs of all direct nodes during this function to prevent such out-of-bound access.

Impact Analysis

This vulnerability can lead to out-of-boundary memory access in the Linux kernel, which may cause system crashes, data corruption, or potential denial of service. If exploited, it could destabilize the system or affect the integrity of data stored on the f2fs filesystem.

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