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nvd-json-data-feeds/CVE-2024/CVE-2024-358xx/CVE-2024-35849.json
cad-safe-bot 66943053a4 Auto-Update: 2025-02-03T17:00:33.409736+00:00
2025-02-03 17:04:00 +00:00

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{
"id": "CVE-2024-35849",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-05-17T15:15:21.777",
"lastModified": "2025-02-03T16:23:16.717",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix information leak in btrfs_ioctl_logical_to_ino()\n\nSyzbot reported the following information leak for in\nbtrfs_ioctl_logical_to_ino():\n\n BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]\n BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x110 lib/usercopy.c:40\n instrument_copy_to_user include/linux/instrumented.h:114 [inline]\n _copy_to_user+0xbc/0x110 lib/usercopy.c:40\n copy_to_user include/linux/uaccess.h:191 [inline]\n btrfs_ioctl_logical_to_ino+0x440/0x750 fs/btrfs/ioctl.c:3499\n btrfs_ioctl+0x714/0x1260\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:904 [inline]\n __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890\n __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890\n x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Uninit was created at:\n __kmalloc_large_node+0x231/0x370 mm/slub.c:3921\n __do_kmalloc_node mm/slub.c:3954 [inline]\n __kmalloc_node+0xb07/0x1060 mm/slub.c:3973\n kmalloc_node include/linux/slab.h:648 [inline]\n kvmalloc_node+0xc0/0x2d0 mm/util.c:634\n kvmalloc include/linux/slab.h:766 [inline]\n init_data_container+0x49/0x1e0 fs/btrfs/backref.c:2779\n btrfs_ioctl_logical_to_ino+0x17c/0x750 fs/btrfs/ioctl.c:3480\n btrfs_ioctl+0x714/0x1260\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:904 [inline]\n __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890\n __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890\n x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Bytes 40-65535 of 65536 are uninitialized\n Memory access of size 65536 starts at ffff888045a40000\n\nThis happens, because we're copying a 'struct btrfs_data_container' back\nto user-space. This btrfs_data_container is allocated in\n'init_data_container()' via kvmalloc(), which does not zero-fill the\nmemory.\n\nFix this by using kvzalloc() which zeroes out the memory on allocation."
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: btrfs: corrige la fuga de informaci\u00f3n en btrfs_ioctl_logic_to_ino() Syzbot inform\u00f3 la siguiente fuga de informaci\u00f3n en btrfs_ioctl_logic_to_ino(): ERROR: KMSAN: kernel-infoleak en instrument_copy_to_user include/linux/instrumented.h: 114 [en l\u00ednea] ERROR: KMSAN: kernel-infoleak en _copy_to_user+0xbc/0x110 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [en l\u00ednea] _copy_to_user+0xbc/0x110 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [en l\u00ednea] btrfs_ioctl_logic_to_ino+0x440/0x750 fs/btrfs/ioctl.c:3499 btrfs_ioctl+0x714/0x1260 vfs_ioctl fs/ioctl.c:51 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c :904 [en l\u00ednea] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h: 17 do_syscall_x64 arco/ x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit se cre\u00f3 en: __kmalloc_large_node+0x231/0x370 mm/slub.c:3921 __do_kmalloc_node mm/slub.c:3954 [en l\u00ednea] __kmalloc_node+0xb07/0x1060 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [en l\u00ednea] kvmalloc_node+0xc0/0x2d0 mm/util.c:634 kvmalloc incluye /linux/slab.h:766 [en l\u00ednea] init_data_container+0x49/0x1e0 fs/btrfs/backref.c:2779 btrfs_ioctl_logic_to_ino+0x17c/0x750 fs/btrfs/ioctl.c:3480 btrfs_ioctl+0x714/0x1260 ctl fs/ioctl.c :51 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c:904 [en l\u00ednea] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x Arco 3b50/x86/incluye /generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 40-65535 de 65536 no est\u00e1n inicializados El acceso a la memoria de tama\u00f1o 65536 comienza en ffff888045a40000. Esto sucede porque estamos copiando una 'estructura btrfs_data_container' nuevamente al espacio de usuario. Este btrfs_data_container se asigna en 'init_data_container()' a trav\u00e9s de kvmalloc(), que no llena la memoria con ceros. Solucione este problema usando kvzalloc() que pone a cero la memoria al asignarla."
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "nvd@nist.gov",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2
}
]
},
"weaknesses": [
{
"source": "nvd@nist.gov",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-908"
}
]
}
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