CVE-2025-38337
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-07-10

Last updated on: 2025-12-16

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata() Since handle->h_transaction may be a NULL pointer, so we should change it to call is_handle_aborted(handle) first before dereferencing it. And the following data-race was reported in my fuzzer: ================================================================== BUG: KCSAN: data-race in jbd2_journal_dirty_metadata / jbd2_journal_dirty_metadata write to 0xffff888011024104 of 4 bytes by task 10881 on cpu 1: jbd2_journal_dirty_metadata+0x2a5/0x770 fs/jbd2/transaction.c:1556 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... read to 0xffff888011024104 of 4 bytes by task 10880 on cpu 0: jbd2_journal_dirty_metadata+0xf2/0x770 fs/jbd2/transaction.c:1512 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... value changed: 0x00000000 -> 0x00000001 ================================================================== This issue is caused by missing data-race annotation for jh->b_modified. Therefore, the missing annotation needs to be added.
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Meta Information
Published
2025-07-10
Last Modified
2025-12-16
Generated
2026-05-27
AI Q&A
2025-07-10
EPSS Evaluated
2026-05-25
NVD
CVE-2025-38337
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.11 (inc) to 5.15.186 (inc)
debian debian_linux 11.0
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a data-race and null-pointer dereference issue in the Linux kernel's jbd2 subsystem, specifically in the function jbd2_journal_dirty_metadata(). The problem arises because handle->h_transaction may be a NULL pointer, and the code did not check if the handle was aborted before dereferencing it. Additionally, a missing data-race annotation for jh->b_modified caused concurrent access issues, leading to potential memory corruption or crashes.


How can this vulnerability impact me? :

This vulnerability can lead to data corruption or system crashes due to race conditions and null-pointer dereferences in the journaling layer of the Linux kernel's filesystem. This may affect system stability and data integrity, potentially causing loss of data or unexpected behavior in systems using the affected kernel versions.


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