CVE-2025-71105
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
f2fs: use global inline_xattr_slab instead of per-sb slab cache
As Hong Yun reported in mailing list:
The bug can be reproduced w/ below scripts: - mount /dev/vdb /mnt1 - mount /dev/vdc /mnt2 - umount /mnt1 - mounnt /dev/vdb /mnt1
The reason is if we created two slab caches, named f2fs_xattr_entry-7:3 and f2fs_xattr_entry-7:7, and they have the same slab size. Actually, slab system will only create one slab cache core structure which has slab name of "f2fs_xattr_entry-7:3", and two slab caches share the same structure and cache address.
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So, if we destroy f2fs_xattr_entry-7:3 cache w/ cache address, it will decrease reference count of slab cache, rather than release slab cache entirely, since there is one more user has referenced the cache.
Then, if we try to create slab cache w/ name "f2fs_xattr_entry-7:3" again, slab system will find that there is existed cache which has the same name and trigger the warning.
Let's changes to use global inline_xattr_slab instead of per-sb slab cache for fixing.
Detalles técnicos trazas, registros y código del informe original
loop7: detected capacity change from 0 to 131072 ------------[ cut here ]------------ kmem_cache of name 'f2fs_xattr_entry-7:7' already exists WARNING: CPU: 0 PID: 24426 at mm/slab_common.c:110 kmem_cache_sanity_check mm/slab_common.c:109 [inline] WARNING: CPU: 0 PID: 24426 at mm/slab_common.c:110 __kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307 CPU: 0 UID: 0 PID: 24426 Comm: syz.7.1370 Not tainted 6.17.0-rc4 #1 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:109 [inline] RIP: 0010:__kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307 Call Trace: __kmem_cache_create include/linux/slab.h:353 [inline] f2fs_kmem_cache_create fs/f2fs/f2fs.h:2943 [inline] f2fs_init_xattr_caches+0xa5/0xe0 fs/f2fs/xattr.c:843 f2fs_fill_super+0x1645/0x2620 fs/f2fs/super.c:4918 get_tree_bdev_flags+0x1fb/0x260 fs/super.c:1692 vfs_get_tree+0x43/0x140 fs/super.c:1815 do_new_mount+0x201/0x550 fs/namespace.c:3808 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount+0x298/0x2f0 fs/namespace.c:4324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8e/0x3a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e
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: 0.14%
- Percentil entre todas las CVEs puntuadas: 3
- 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 (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1eb0b130196bcbc56c5c80c83139fa70c0aa82c5
- https://git.kernel.org/stable/c/1f27ef42bb0b7c0740c5616ec577ec188b8a1d05
- https://git.kernel.org/stable/c/474cc3ed37436ddfd63cac8dbffe3b1e219e9100
- https://git.kernel.org/stable/c/72ce19dfed162da6e430467333b2da70471d08a4
- https://git.kernel.org/stable/c/93d30fe19660dec6bf1bd3d5c186c1c737b21aa5
- https://git.kernel.org/stable/c/be4c3a3c6c2304a8fcd14095d18d26f0cc4e222a
- https://git.kernel.org/stable/c/e6d828eae00ec192e18c2ddaa2fd32050a96048a
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: use global inline_xattr_slab instead of per-sb slab cache\n\nAs Hong Yun reported in mailing list:\n\nloop7: detected capacity change from 0 to 131072\n------------[ cut here ]------------\nkmem_cache of name 'f2fs_xattr_entry-7:7' already exists\nWARNING: CPU: 0 PID: 24426 at mm/slab_common.c:110 kmem_cache_sanity_check mm/slab_common.c:109 [inline]\nWARNING: CPU: 0 PID: 24426 at mm/slab_common.c:110 __kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307\nCPU: 0 UID: 0 PID: 24426 Comm: syz.7.1370 Not tainted 6.17.0-rc4 #1 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\nRIP: 0010:kmem_cache_sanity_check mm/slab_common.c:109 [inline]\nRIP: 0010:__kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307\nCall Trace:\n __kmem_cache_create include/linux/slab.h:353 [inline]\n f2fs_kmem_cache_create fs/f2fs/f2fs.h:2943 [inline]\n f2fs_init_xattr_caches+0xa5/0xe0 fs/f2fs/xattr.c:843\n f2fs_fill_super+0x1645/0x2620 fs/f2fs/super.c:4918\n get_tree_bdev_flags+0x1fb/0x260 fs/super.c:1692\n vfs_get_tree+0x43/0x140 fs/super.c:1815\n do_new_mount+0x201/0x550 fs/namespace.c:3808\n do_mount fs/namespace.c:4136 [inline]\n __do_sys_mount fs/namespace.c:4347 [inline]\n __se_sys_mount+0x298/0x2f0 fs/namespace.c:4324\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x8e/0x3a0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe bug can be reproduced w/ below scripts:\n- mount /dev/vdb /mnt1\n- mount /dev/vdc /mnt2\n- umount /mnt1\n- mounnt /dev/vdb /mnt1\n\nThe reason is if we created two slab caches, named f2fs_xattr_entry-7:3\nand f2fs_xattr_entry-7:7, and they have the same slab size. Actually,\nslab system will only create one slab cache core structure which has\nslab name of \"f2fs_xattr_entry-7:3\", and two slab caches share the same\nstructure and cache address.\n\nSo, if we destroy f2fs_xattr_entry-7:3 cache w/ cache address, it will\ndecrease reference count of slab cache, rather than release slab cache\nentirely, since there is one more user has referenced the cache.\n\nThen, if we try to create slab cache w/ name \"f2fs_xattr_entry-7:3\" again,\nslab system will find that there is existed cache which has the same name\nand trigger the warning.\n\nLet's changes to use global inline_xattr_slab instead of per-sb slab cache\nfor fixing."
},
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"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nf2fs: usar inline_xattr_slab global en lugar de caché de slab por sb\n\nComo Hong Yun informó en la lista de correo:\n\nloop7: capacidad detectada cambió de 0 a 131072\n------------[ cortar aquí ]------------\nkmem_cache de nombre 'f2fs_xattr_entry-7:7' ya existe\nAdvertencia: CPU: 0 PID: 24426 en mm/slab_common.c:110 kmem_cache_sanity_check mm/slab_common.c:109 [inline]\nAdvertencia: CPU: 0 PID: 24426 en mm/slab_common.c:110 __kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307\nCPU: 0 UID: 0 PID: 24426 Comm: syz.7.1370 No contaminado 6.17.0-rc4 #1 PREEMPT(full)\nNombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\nRIP: 0010:kmem_cache_sanity_check mm/slab_common.c:109 [inline]\nRIP: 0010:__kmem_cache_create_args+0xa6/0x320 mm/slab_common.c:307\nTraza de llamada:\n __kmem_cache_create include/linux/slab.h:353 [inline]\n f2fs_kmem_cache_create fs/f2fs/f2fs.h:2943 [inline]\n f2fs_init_xattr_caches+0xa5/0xe0 fs/f2fs/xattr.c:843\n f2fs_fill_super+0x1645/0x2620 fs/f2fs/super.c:4918\n get_tree_bdev_flags+0x1fb/0x260 fs/super.c:1692\n vfs_get_tree+0x43/0x140 fs/super.c:1815\n do_new_mount+0x201/0x550 fs/namespace.c:3808\n do_mount fs/namespace.c:4136 [inline]\n __do_sys_mount fs/namespace.c:4347 [inline]\n __se_sys_mount+0x298/0x2f0 fs/namespace.c:4324\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x8e/0x3a0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nEl error puede ser reproducido con los siguientes scripts:\n- mount /dev/vdb /mnt1\n- mount /dev/vdc /mnt2\n- umount /mnt1\n- mounnt /dev/vdb /mnt1\n\nLa razón es si creamos dos cachés de slab, llamadas f2fs_xattr_entry-7:3 y f2fs_xattr_entry-7:7, y tienen el mismo tamaño de slab. En realidad, el sistema de slab solo creará una estructura central de caché de slab que tiene el nombre de slab \"f2fs_xattr_entry-7:3\", y dos cachés de slab comparten la misma estructura y dirección de caché.\n\nEntonces, si destruimos la caché f2fs_xattr_entry-7:3 con la dirección de caché, disminuirá el conteo de referencias de la caché de slab, en lugar de liberar la caché de slab por completo, ya que hay un usuario más que ha referenciado la caché.\n\nLuego, si intentamos crear la caché de slab con el nombre \"f2fs_xattr_entry-7:3\" nuevamente, el sistema de slab encontrará que existe una caché que tiene el mismo nombre y activará la advertencia.\n\nCambiemos para usar inline_xattr_slab global en lugar de caché de slab por sb para la corrección."
}
],
"lastModified": "2026-06-17T10:03:40.450",
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