CVE-2025-38337
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.
How to fix
- linux linux_kernel5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4 or later
- git.kernel.org/stable/c/23361b479f2700c00960d3ae9cdc8ededa762d47
- git.kernel.org/stable/c/2e7c64d7a92c031d016f11c8e8cb05131ab7b75a
- git.kernel.org/stable/c/43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e
- git.kernel.org/stable/c/5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5
- git.kernel.org/stable/c/a377996d714afb8d4d5f4906336f78510039da29
- git.kernel.org/stable/c/af98b0157adf6504fade79b3e6cb260c4ff68e37
- git.kernel.org/stable/c/ec669e5bf409f16e464bfad75f0ba039a45de29a
- git.kernel.org/stable/c/f78b38af3540b4875147b7b884ee11a27b3dbf4c
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.3 ≤ v < 5.4.295, 5.5 ≤ v < 5.10.239, 5.11 ≤ v < 5.15.186, 5.16 ≤ v < 6.1.142, 6.2 ≤ v < 6.6.95, 6.7 ≤ v < 6.12.35, 6.13 ≤ v < 6.15.4 | 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4 |
| debian debian_linux | 11.0 | — |
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