{"id":"CVE-2025-37742","state":"PUBLISHED","title":"jfs: Fix uninit-value access of imap allocated in the diMount() function","description":"In the Linux kernel, the following vulnerability has been resolved:\n\njfs: Fix uninit-value access of imap allocated in the diMount() function\n\nsyzbot reports that hex_dump_to_buffer is using uninit-value:\n\n=====================================================\nBUG: KMSAN: uninit-value in hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171\nhex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171\nprint_hex_dump+0x13d/0x3e0 lib/hexdump.c:276\ndiFree+0x5ba/0x4350 fs/jfs/jfs_imap.c:876\njfs_evict_inode+0x510/0x550 fs/jfs/inode.c:156\nevict+0x723/0xd10 fs/inode.c:796\niput_final fs/inode.c:1946 [inline]\niput+0x97b/0xdb0 fs/inode.c:1972\ntxUpdateMap+0xf3e/0x1150 fs/jfs/jfs_txnmgr.c:2367\ntxLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]\njfs_lazycommit+0x627/0x11d0 fs/jfs/jfs_txnmgr.c:2733\nkthread+0x6b9/0xef0 kernel/kthread.c:464\nret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\nUninit was created at:\nslab_post_alloc_hook mm/slub.c:4121 [inline]\nslab_alloc_node mm/slub.c:4164 [inline]\n__kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320\nkmalloc_noprof include/linux/slab.h:901 [inline]\ndiMount+0x61/0x7f0 fs/jfs/jfs_imap.c:105\njfs_mount+0xa8e/0x11d0 fs/jfs/jfs_mount.c:176\njfs_fill_super+0xa47/0x17c0 fs/jfs/super.c:523\nget_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636\nget_tree_bdev+0x37/0x50 fs/super.c:1659\njfs_get_tree+0x34/0x40 fs/jfs/super.c:635\nvfs_get_tree+0xb1/0x5a0 fs/super.c:1814\ndo_new_mount+0x71f/0x15e0 fs/namespace.c:3560\npath_mount+0x742/0x1f10 fs/namespace.c:3887\ndo_mount fs/namespace.c:3900 [inline]\n__do_sys_mount fs/namespace.c:4111 [inline]\n__se_sys_mount+0x71f/0x800 fs/namespace.c:4088\n__x64_sys_mount+0xe4/0x150 fs/namespace.c:4088\nx64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\n=====================================================\n\nThe reason is that imap is not properly initialized after memory\nallocation. It will cause the snprintf() function to write uninitialized\ndata into linebuf within hex_dump_to_buffer().\n\nFix this by using kzalloc instead of kmalloc to clear its content at the\nbeginning in diMount().","publishedAt":"2025-05-01T12:55:50.603Z","updatedAt":"2026-05-11T21:14:17.131Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4f10732712fce33e53703ffe5ed9155f23814097","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cab1852368dd74d629ee02abdbc559218ca64dde","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"067347e00a3a7d04afed93f080c6c131e5dd15ee","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"63148ce4904faa668daffdd1d3c1199ae315ef2c","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"7057f3aab47629d38e54eae83505813cf0da1e4b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d0d7eca253ccd0619b3d2b683ffe32218ebca9ac","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9629d7d66c621671d9a47afe27ca9336bfc8a9ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/jfs/jfs_imap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.15.181","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.135","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.88","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.24","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.12","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14.3","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/jfs/jfs_imap.c"]}],"references":["https://git.kernel.org/stable/c/4f10732712fce33e53703ffe5ed9155f23814097","https://git.kernel.org/stable/c/cab1852368dd74d629ee02abdbc559218ca64dde","https://git.kernel.org/stable/c/067347e00a3a7d04afed93f080c6c131e5dd15ee","https://git.kernel.org/stable/c/63148ce4904faa668daffdd1d3c1199ae315ef2c","https://git.kernel.org/stable/c/7057f3aab47629d38e54eae83505813cf0da1e4b","https://git.kernel.org/stable/c/d0d7eca253ccd0619b3d2b683ffe32218ebca9ac","https://git.kernel.org/stable/c/9629d7d66c621671d9a47afe27ca9336bfc8a9ea","https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:03.054Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/37xxx/CVE-2025-37742.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-37742","state":"PUBLISHED","datePublished":"2025-05-01T12:55:50.603Z","dateUpdated":"2026-05-11T21:14:17.131Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:23.936Z"},"containers":{"cna":{"title":"jfs: Fix uninit-value access of imap allocated in the diMount() function","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\njfs: Fix uninit-value access of imap allocated in the diMount() function\n\nsyzbot reports that hex_dump_to_buffer is using uninit-value:\n\n=====================================================\nBUG: KMSAN: uninit-value in hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171\nhex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171\nprint_hex_dump+0x13d/0x3e0 lib/hexdump.c:276\ndiFree+0x5ba/0x4350 fs/jfs/jfs_imap.c:876\njfs_evict_inode+0x510/0x550 fs/jfs/inode.c:156\nevict+0x723/0xd10 fs/inode.c:796\niput_final fs/inode.c:1946 [inline]\niput+0x97b/0xdb0 fs/inode.c:1972\ntxUpdateMap+0xf3e/0x1150 fs/jfs/jfs_txnmgr.c:2367\ntxLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]\njfs_lazycommit+0x627/0x11d0 fs/jfs/jfs_txnmgr.c:2733\nkthread+0x6b9/0xef0 kernel/kthread.c:464\nret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\nUninit was created at:\nslab_post_alloc_hook mm/slub.c:4121 [inline]\nslab_alloc_node mm/slub.c:4164 [inline]\n__kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320\nkmalloc_noprof include/linux/slab.h:901 [inline]\ndiMount+0x61/0x7f0 fs/jfs/jfs_imap.c:105\njfs_mount+0xa8e/0x11d0 fs/jfs/jfs_mount.c:176\njfs_fill_super+0xa47/0x17c0 fs/jfs/super.c:523\nget_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636\nget_tree_bdev+0x37/0x50 fs/super.c:1659\njfs_get_tree+0x34/0x40 fs/jfs/super.c:635\nvfs_get_tree+0xb1/0x5a0 fs/super.c:1814\ndo_new_mount+0x71f/0x15e0 fs/namespace.c:3560\npath_mount+0x742/0x1f10 fs/namespace.c:3887\ndo_mount fs/namespace.c:3900 [inline]\n__do_sys_mount fs/namespace.c:4111 [inline]\n__se_sys_mount+0x71f/0x800 fs/namespace.c:4088\n__x64_sys_mount+0xe4/0x150 fs/namespace.c:4088\nx64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\n=====================================================\n\nThe reason is that imap is not properly initialized after memory\nallocation. It will cause the snprintf() function to write uninitialized\ndata into linebuf within hex_dump_to_buffer().\n\nFix this by using kzalloc instead of kmalloc to clear its content at the\nbeginning in diMount()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4f10732712fce33e53703ffe5ed9155f23814097","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cab1852368dd74d629ee02abdbc559218ca64dde","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"067347e00a3a7d04afed93f080c6c131e5dd15ee","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"63148ce4904faa668daffdd1d3c1199ae315ef2c","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"7057f3aab47629d38e54eae83505813cf0da1e4b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d0d7eca253ccd0619b3d2b683ffe32218ebca9ac","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9629d7d66c621671d9a47afe27ca9336bfc8a9ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/jfs/jfs_imap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.15.181","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.135","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.88","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.24","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.12","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14.3","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/jfs/jfs_imap.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4f10732712fce33e53703ffe5ed9155f23814097"},{"url":"https://git.kernel.org/stable/c/cab1852368dd74d629ee02abdbc559218ca64dde"},{"url":"https://git.kernel.org/stable/c/067347e00a3a7d04afed93f080c6c131e5dd15ee"},{"url":"https://git.kernel.org/stable/c/63148ce4904faa668daffdd1d3c1199ae315ef2c"},{"url":"https://git.kernel.org/stable/c/7057f3aab47629d38e54eae83505813cf0da1e4b"},{"url":"https://git.kernel.org/stable/c/d0d7eca253ccd0619b3d2b683ffe32218ebca9ac"},{"url":"https://git.kernel.org/stable/c/9629d7d66c621671d9a47afe27ca9336bfc8a9ea"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:14:17.131Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.181"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.135"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.13.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.14.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T19:54:20.666Z"}}]}}}