CVE-2024-49958
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: reserve space for inline xattr before attaching reflink tree
One of our customers reported a crash and a corrupted ocfs2 filesystem. The crash was due to the detection of corruption. Upon troubleshooting, the fsck -fn output showed the below corruption
[EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record, but fsck believes the largest valid value is 227. Clamp the next record value? n
The stat output from the debugfs.ocfs2 showed the following corruption where the "Next Free Rec:" had overshot the "Count:" in the root metadata block.
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The issue was in the reflink workfow while reserving space for inline xattr. The problematic function is ocfs2_reflink_xattr_inline(). By the time this function is called the reflink tree is already recreated at the destination inode from the source inode. At this point, this function reserves space for inline xattrs at the destination inode without even checking if there is space at the root metadata block. It simply reduces the l_count from 243 to 227 thereby making space of 256 bytes for inline xattr whereas the inode already has extents beyond this index (in this case up to 230), thereby causing corruption.
The fix for this is to reserve space for inline metadata at the destination inode before the reflink tree gets recreated. The customer has verified the fix.
Detalles técnicos trazas, registros y código del informe original
Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856)
FS Generation: 904309833 (0x35e6ac49)
CRC32: 00000000 ECC: 0000
Type: Regular Attr: 0x0 Flags: Valid
Dynamic Features: (0x16) HasXattr InlineXattr Refcounted
Extended Attributes Block: 0 Extended Attributes Inline Size: 256
User: 0 (root) Group: 0 (root) Size: 281320357888
Links: 1 Clusters: 141738
ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024
atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024
mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024
dtime: 0x0 -- Wed Dec 31 17:00:00 1969
Refcount Block: 2777346
Last Extblk: 2886943 Orphan Slot: 0
Sub Alloc Slot: 0 Sub Alloc Bit: 14
Tree Depth: 1 Count: 227 Next Free Rec: 230
## Offset Clusters Block#
0 0 2310 2776351
1 2310 2139 2777375
2 4449 1221 2778399
3 5670 731 2779423
4 6401 566 2780447
....... .... .......
....... .... .......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: 0.27%
- Percentil entre todas las CVEs puntuadas: 18
- Fecha de la puntuación: 5/10/2026
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/020f5c53c17f66c0a8f2d37dad27ace301b8d8a1
- https://git.kernel.org/stable/c/5c2072f02c0d75802ec28ec703b7d43a0dd008b5
- https://git.kernel.org/stable/c/5c9807c523b4fca81d3e8e864dabc8c806402121
- https://git.kernel.org/stable/c/5ca60b86f57a4d9648f68418a725b3a7de2816b0
- https://git.kernel.org/stable/c/637c00e06564a945e9d0edb3d78d362d64935f9f
- https://git.kernel.org/stable/c/74364cb578dcc0b6c9109519d19cbe5a56afac9a
- https://git.kernel.org/stable/c/96ce4c3537114d1698be635f5e36c62dc49df7a4
- https://git.kernel.org/stable/c/9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9
- https://git.kernel.org/stable/c/aac31d654a0a31cb0d2fa36ae694f4e164a52707
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reserve space for inline xattr before attaching reflink tree\n\nOne of our customers reported a crash and a corrupted ocfs2 filesystem. \nThe crash was due to the detection of corruption. Upon troubleshooting,\nthe fsck -fn output showed the below corruption\n\n[EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record,\nbut fsck believes the largest valid value is 227. Clamp the next record value? n\n\nThe stat output from the debugfs.ocfs2 showed the following corruption\nwhere the \"Next Free Rec:\" had overshot the \"Count:\" in the root metadata\nblock.\n\n Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856)\n FS Generation: 904309833 (0x35e6ac49)\n CRC32: 00000000 ECC: 0000\n Type: Regular Attr: 0x0 Flags: Valid\n Dynamic Features: (0x16) HasXattr InlineXattr Refcounted\n Extended Attributes Block: 0 Extended Attributes Inline Size: 256\n User: 0 (root) Group: 0 (root) Size: 281320357888\n Links: 1 Clusters: 141738\n ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024\n atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024\n mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024\n dtime: 0x0 -- Wed Dec 31 17:00:00 1969\n Refcount Block: 2777346\n Last Extblk: 2886943 Orphan Slot: 0\n Sub Alloc Slot: 0 Sub Alloc Bit: 14\n Tree Depth: 1 Count: 227 Next Free Rec: 230\n ## Offset Clusters Block#\n 0 0 2310 2776351\n 1 2310 2139 2777375\n 2 4449 1221 2778399\n 3 5670 731 2779423\n 4 6401 566 2780447\n ....... .... .......\n ....... .... .......\n\nThe issue was in the reflink workfow while reserving space for inline\nxattr. The problematic function is ocfs2_reflink_xattr_inline(). By the\ntime this function is called the reflink tree is already recreated at the\ndestination inode from the source inode. At this point, this function\nreserves space for inline xattrs at the destination inode without even\nchecking if there is space at the root metadata block. It simply reduces\nthe l_count from 243 to 227 thereby making space of 256 bytes for inline\nxattr whereas the inode already has extents beyond this index (in this\ncase up to 230), thereby causing corruption.\n\nThe fix for this is to reserve space for inline metadata at the destination\ninode before the reflink tree gets recreated. The customer has verified the\nfix."
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{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: reserva espacio para xattr en línea antes de adjuntar árbol reflink Uno de nuestros clientes informó de un fallo y un sistema de archivos ocfs2 dañado. El fallo se debió a la detección de una corrupción. Tras la resolución de problemas, la salida de fsck -fn mostró la siguiente corrupción [EXTENT_LIST_FREE] La lista de extensiones del propietario 33080590 afirma que 230 es el siguiente registro de cadena libre, pero fsck cree que el valor válido más grande es 227. ¿Fijar el siguiente valor de registro? n La salida de estadísticas de debugfs.ocfs2 mostró la siguiente corrupción, donde \"Next Free Rec:\" había superado \"Count:\" en el bloque de metadatos raíz. Inodo: 33080590 Modo: 0640 Generación: 2619713622 (0x9c25a856) Generación FS: 904309833 (0x35e6ac49) CRC32: 00000000 ECC: 0000 Tipo: Regular Atributo: 0x0 Indicadores: Válido Características dinámicas: (0x16) HasXattr InlineXattr Refcounted Bloque de atributos extendidos: 0 Tamaño en línea de atributos extendidos: 256 Usuario: 0 (raíz) Grupo: 0 (raíz) Tamaño: 281320357888 Enlaces: 1 Clústeres: 141738 ctime: 0x66911b56 0x316edcb8 -- Vie Jul 12 06:02:30.829349048 2024 atime: 0x66911d6b 0x7f7a28d -- Vie Jul 12 06:11:23.133669517 2024 mtime: 0x66911b56 0x12ed75d7 -- Vie Jul 12 06:02:30.317552087 2024 dtime: 0x0 -- Mié Dic 31 17:00:00 1969 Refcount Block: 2777346 Last Extblk: 2886943 Orphan Slot: 0 Sub Alloc Slot: 0 Sub Alloc Bit: 14 Tree Depth: 1 Count: 227 Next Free Rec: 230 ## Offset Clusters Block# 0 0 2310 2776351 1 2310 2139 2777375 2 4449 1221 2778399 3 5670 731 2779423 4 6401 566 2780447 ....... .... ....... ....... ....... ....... El problema estaba en el flujo de trabajo de reflink mientras se reservaba espacio para xattr en línea. La función problemática es ocfs2_reflink_xattr_inline(). Para cuando se llama a esta función, el árbol de reflink ya se ha recreado en el inodo de destino a partir del inodo de origen. En este punto, esta función reserva espacio para xattrs en línea en el inodo de destino sin siquiera verificar si hay espacio en el bloque de metadatos raíz. Simplemente reduce el l_count de 243 a 227, lo que crea un espacio de 256 bytes para xattr en línea, mientras que el inodo ya tiene extensiones más allá de este índice (en este caso, hasta 230), lo que provoca corrupción. La solución para esto es reservar espacio para metadatos en línea en el inodo de destino antes de que se vuelva a crear el árbol de enlaces de referencia. El cliente ha verificado la solución."
}
],
"lastModified": "2026-08-04T11:21:02.090",
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}
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}