{"id":"CVE-2025-38337","title":"jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()\n\nSince handle->h_transaction may be a NULL pointer, so we should change it\nto call is_handle_abo…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < ec669e5bf409f16e464bfad75f0ba039a45de29a","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 23361b479f2700c00960d3ae9cdc8ededa762d47","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 2e7c64d7a92c031d016f11c8e8cb05131ab7b75a","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < f78b38af3540b4875147b7b884ee11a27b3dbf4c","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < a377996d714afb8d4d5f4906336f78510039da29","Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < af98b0157adf6504fade79b3e6cb260c4ff68e37","Linux 4.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:54:56.222182Z"},"published":"2025-07-10","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:02:33.964Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38337","references":[{"url":"https://git.kernel.org/stable/c/5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5"},{"url":"https://git.kernel.org/stable/c/ec669e5bf409f16e464bfad75f0ba039a45de29a"},{"url":"https://git.kernel.org/stable/c/43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e"},{"url":"https://git.kernel.org/stable/c/23361b479f2700c00960d3ae9cdc8ededa762d47"},{"url":"https://git.kernel.org/stable/c/2e7c64d7a92c031d016f11c8e8cb05131ab7b75a"},{"url":"https://git.kernel.org/stable/c/f78b38af3540b4875147b7b884ee11a27b3dbf4c"},{"url":"https://git.kernel.org/stable/c/a377996d714afb8d4d5f4906336f78510039da29"},{"url":"https://git.kernel.org/stable/c/af98b0157adf6504fade79b3e6cb260c4ff68e37"}],"tags":["cve.org"],"epss":0.00196,"epssPercentile":0.09314,"ingestedAt":"2026-11-05T22:38:31.957Z","slug":"CVE-2025-38337","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\njbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()\n\nSince handle->h_transaction may be a NULL pointer, so we should change it\nto call is_handle_aborted(handle) first before dereferencing it.\n\nAnd the following data-race was reported in my fuzzer:\n\n==================================================================\nBUG: KCSAN: data-race in jbd2_journal_dirty_metadata / jbd2_journal_dirty_metadata\n\nwrite to 0xffff888011024104 of 4 bytes by task 10881 on cpu 1:\n jbd2_journal_dirty_metadata+0x2a5/0x770 fs/jbd2/transaction.c:1556\n __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358\n ext4_do_update_inode fs/ext4/inode.c:5220 [inline]\n ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869\n __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074\n ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103\n....\n\nread to 0xffff888011024104 of 4 bytes by task 10880 on cpu 0:\n jbd2_journal_dirty_metadata+0xf2/0x770 fs/jbd2/transaction.c:1512\n __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358\n ext4_do_update_inode fs/ext4/inode.c:5220 [inline]\n ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869\n __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074\n ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103\n....\n\nvalue changed: 0x00000000 -> 0x00000001\n==================================================================\n\nThis issue is caused by missing data-race annotation for jh->b_modified.\nTherefore, the missing annotation needs to be added.\n\n## Affected\n\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < ec669e5bf409f16e464bfad75f0ba039a45de29a`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 23361b479f2700c00960d3ae9cdc8ededa762d47`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 2e7c64d7a92c031d016f11c8e8cb05131ab7b75a`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < f78b38af3540b4875147b7b884ee11a27b3dbf4c`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < a377996d714afb8d4d5f4906336f78510039da29`\n- `Linux >= 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < af98b0157adf6504fade79b3e6cb260c4ff68e37`\n- `Linux 4.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}