CVE-2025-38337None▾ SunlitIn 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_abo…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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 ....
This issue is caused by missing data-race annotation for jh->b_modified. Therefore, the missing annotation needs to be added.
Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < ec669e5bf409f16e464bfad75f0ba039a45de29aLinux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 43d5e3bb5f1dcd91e30238ea0b59a5f77063f84eLinux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 23361b479f2700c00960d3ae9cdc8ededa762d47Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 2e7c64d7a92c031d016f11c8e8cb05131ab7b75aLinux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < f78b38af3540b4875147b7b884ee11a27b3dbf4cLinux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < a377996d714afb8d4d5f4906336f78510039da29Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < af98b0157adf6504fade79b3e6cb260c4ff68e37Linux 4.3Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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