CVE-2025-37742
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
jfs: Fix uninit-value access of imap allocated in the diMount() function
syzbot reports that hex_dump_to_buffer is using uninit-value:
The reason is that imap is not properly initialized after memory allocation. It will cause the snprintf() function to write uninitialized data into linebuf within hex_dump_to_buffer().
Fix this by using kzalloc instead of kmalloc to clear its content at the beginning in diMount().
Detalles técnicos trazas, registros y código del informe original
===================================================== BUG: KMSAN: uninit-value in hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171 hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171 print_hex_dump+0x13d/0x3e0 lib/hexdump.c:276 diFree+0x5ba/0x4350 fs/jfs/jfs_imap.c:876 jfs_evict_inode+0x510/0x550 fs/jfs/inode.c:156 evict+0x723/0xd10 fs/inode.c:796 iput_final fs/inode.c:1946 [inline] iput+0x97b/0xdb0 fs/inode.c:1972 txUpdateMap+0xf3e/0x1150 fs/jfs/jfs_txnmgr.c:2367 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline] jfs_lazycommit+0x627/0x11d0 fs/jfs/jfs_txnmgr.c:2733 kthread+0x6b9/0xef0 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_post_alloc_hook mm/slub.c:4121 [inline] slab_alloc_node mm/slub.c:4164 [inline] __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] diMount+0x61/0x7f0 fs/jfs/jfs_imap.c:105 jfs_mount+0xa8e/0x11d0 fs/jfs/jfs_mount.c:176 jfs_fill_super+0xa47/0x17c0 fs/jfs/super.c:523 get_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636 get_tree_bdev+0x37/0x50 fs/super.c:1659 jfs_get_tree+0x34/0x40 fs/jfs/super.c:635 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560 path_mount+0x742/0x1f10 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x71f/0x800 fs/namespace.c:4088 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f =====================================================
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-908
Referencias
- https://git.kernel.org/stable/c/067347e00a3a7d04afed93f080c6c131e5dd15ee
- https://git.kernel.org/stable/c/4f10732712fce33e53703ffe5ed9155f23814097
- https://git.kernel.org/stable/c/63148ce4904faa668daffdd1d3c1199ae315ef2c
- https://git.kernel.org/stable/c/7057f3aab47629d38e54eae83505813cf0da1e4b
- https://git.kernel.org/stable/c/9629d7d66c621671d9a47afe27ca9336bfc8a9ea
- https://git.kernel.org/stable/c/cab1852368dd74d629ee02abdbc559218ca64dde
- https://git.kernel.org/stable/c/d0d7eca253ccd0619b3d2b683ffe32218ebca9ac
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
JSON original (NVD)
Mostrar
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"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
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"published": "2025-05-01T13:15:52.870",
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"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()."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: jfs: Se corrige el acceso a un valor no inicializado de imap asignado en la función diMount() syzbot informa que hex_dump_to_buffer está usando un valor no inicializado: ======================================================== ERROR: KMSAN: un valor no inicializado en hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171 hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171 print_hex_dump+0x13d/0x3e0 lib/hexdump.c:276 diFree+0x5ba/0x4350 fs/jfs/jfs_imap.c:876 jfs_evict_inode+0x510/0x550 fs/jfs/inode.c:156 evict+0x723/0xd10 fs/inode.c:796 iput_final fs/inode.c:1946 [en línea] iput+0x97b/0xdb0 fs/inode.c:1972 txUpdateMap+0xf3e/0x1150 fs/jfs/jfs_txnmgr.c:2367 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [en línea] jfs_lazycommit+0x627/0x11d0 fs/jfs/jfs_txnmgr.c:2733 kthread+0x6b9/0xef0 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit se creó en: slab_post_alloc_hook mm/slub.c:4121 [en línea] slab_alloc_node mm/slub.c:4164 [en línea] __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [en línea] diMount+0x61/0x7f0 fs/jfs/jfs_imap.c:105 jfs_mount+0xa8e/0x11d0 fs/jfs/jfs_mount.c:176 jfs_fill_super+0xa47/0x17c0 fs/jfs/super.c:523 obtener_árbol_bdev_flags+0x6ec/0x910 fs/super.c:1636 obtener_árbol_bdev+0x37/0x50 fs/super.c:1659 jfs_obtener_árbol+0x34/0x40 fs/jfs/super.c:635 vfs_obtener_árbol+0xb1/0x5a0 fs/super.c:1814 hacer_nuevo_montaje+0x71f/0x15e0 fs/espacio_de_nombres.c:3560 path_mount+0x742/0x1f10 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [en línea] __do_sys_mount fs/namespace.c:4111 [en línea] __se_sys_mount+0x71f/0x800 fs/namespace.c:4088 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:52 [en línea] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f == ..."
}
],
"lastModified": "2026-06-17T09:15:21.087",
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