CVE-2022-49409
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix bug_on in __es_tree_search
In the ext4_valid_extent_entries function, if prev is 0, no error is returned even if lblock<=prev. This was intended to skip the check on the first extent, but in the error image above, prev=0+1-1=0 when checking the second extent, so even though lblock<=prev, the function does not return an error. As a result, bug_ON occurs in __es_tree_search and the system panics.
To solve this problem, we only need to check that: 1. The lblock of the first extent is not less than 0. 2. The lblock of the next extent is not less than the next block of the previous extent. The same applies to extent_idx.
Detalles técnicos trazas, registros y código del informe original
Hulk Robot reported a BUG_ON:
==================================================================
kernel BUG at fs/ext4/extents_status.c:199!
[...]
RIP: 0010:ext4_es_end fs/ext4/extents_status.c:199 [inline]
RIP: 0010:__es_tree_search+0x1e0/0x260 fs/ext4/extents_status.c:217
[...]
Call Trace:
ext4_es_cache_extent+0x109/0x340 fs/ext4/extents_status.c:766
ext4_cache_extents+0x239/0x2e0 fs/ext4/extents.c:561
ext4_find_extent+0x6b7/0xa20 fs/ext4/extents.c:964
ext4_ext_map_blocks+0x16b/0x4b70 fs/ext4/extents.c:4384
ext4_map_blocks+0xe26/0x19f0 fs/ext4/inode.c:567
ext4_getblk+0x320/0x4c0 fs/ext4/inode.c:980
ext4_bread+0x2d/0x170 fs/ext4/inode.c:1031
ext4_quota_read+0x248/0x320 fs/ext4/super.c:6257
v2_read_header+0x78/0x110 fs/quota/quota_v2.c:63
v2_check_quota_file+0x76/0x230 fs/quota/quota_v2.c:82
vfs_load_quota_inode+0x5d1/0x1530 fs/quota/dquot.c:2368
dquot_enable+0x28a/0x330 fs/quota/dquot.c:2490
ext4_quota_enable fs/ext4/super.c:6137 [inline]
ext4_enable_quotas+0x5d7/0x960 fs/ext4/super.c:6163
ext4_fill_super+0xa7c9/0xdc00 fs/ext4/super.c:4754
mount_bdev+0x2e9/0x3b0 fs/super.c:1158
mount_fs+0x4b/0x1e4 fs/super.c:1261
[...]
==================================================================
Above issue may happen as follows:
-------------------------------------
ext4_fill_super
ext4_enable_quotas
ext4_quota_enable
ext4_iget
__ext4_iget
ext4_ext_check_inode
ext4_ext_check
__ext4_ext_check
ext4_valid_extent_entries
Check for overlapping extents does't take effect
dquot_enable
vfs_load_quota_inode
v2_check_quota_file
v2_read_header
ext4_quota_read
ext4_bread
ext4_getblk
ext4_map_blocks
ext4_ext_map_blocks
ext4_find_extent
ext4_cache_extents
ext4_es_cache_extent
ext4_es_cache_extent
__es_tree_search
ext4_es_end
BUG_ON(es->es_lblk + es->es_len < es->es_lblk)
The error ext4 extents is as follows:
0af3 0300 0400 0000 00000000 extent_header
00000000 0100 0000 12000000 extent1
00000000 0100 0000 18000000 extent2
02000000 0400 0000 14000000 extent3CVSS
- 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: 17
- 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
- CWE-617
Referencias
- https://git.kernel.org/stable/c/3c617827cd51018bc377bd2954e176920ddbcfad
- https://git.kernel.org/stable/c/4fd58b5cf118d2d9038a0b8c9cc0e43096297686
- https://git.kernel.org/stable/c/59cf2fabbfe76de29d88dd7ae69858a25735b59f
- https://git.kernel.org/stable/c/d0083459e2b6b07ebd78bea2fe684a19cc0f3d0f
- https://git.kernel.org/stable/c/d36f6ed761b53933b0b4126486c10d3da7751e7f
- https://git.kernel.org/stable/c/ea6ea18b3ab0c0d7fefffb3c4d27df758b1c790a
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",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug_on in __es_tree_search\n\nHulk Robot reported a BUG_ON:\n==================================================================\nkernel BUG at fs/ext4/extents_status.c:199!\n[...]\nRIP: 0010:ext4_es_end fs/ext4/extents_status.c:199 [inline]\nRIP: 0010:__es_tree_search+0x1e0/0x260 fs/ext4/extents_status.c:217\n[...]\nCall Trace:\n ext4_es_cache_extent+0x109/0x340 fs/ext4/extents_status.c:766\n ext4_cache_extents+0x239/0x2e0 fs/ext4/extents.c:561\n ext4_find_extent+0x6b7/0xa20 fs/ext4/extents.c:964\n ext4_ext_map_blocks+0x16b/0x4b70 fs/ext4/extents.c:4384\n ext4_map_blocks+0xe26/0x19f0 fs/ext4/inode.c:567\n ext4_getblk+0x320/0x4c0 fs/ext4/inode.c:980\n ext4_bread+0x2d/0x170 fs/ext4/inode.c:1031\n ext4_quota_read+0x248/0x320 fs/ext4/super.c:6257\n v2_read_header+0x78/0x110 fs/quota/quota_v2.c:63\n v2_check_quota_file+0x76/0x230 fs/quota/quota_v2.c:82\n vfs_load_quota_inode+0x5d1/0x1530 fs/quota/dquot.c:2368\n dquot_enable+0x28a/0x330 fs/quota/dquot.c:2490\n ext4_quota_enable fs/ext4/super.c:6137 [inline]\n ext4_enable_quotas+0x5d7/0x960 fs/ext4/super.c:6163\n ext4_fill_super+0xa7c9/0xdc00 fs/ext4/super.c:4754\n mount_bdev+0x2e9/0x3b0 fs/super.c:1158\n mount_fs+0x4b/0x1e4 fs/super.c:1261\n[...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\next4_fill_super\n ext4_enable_quotas\n ext4_quota_enable\n ext4_iget\n __ext4_iget\n ext4_ext_check_inode\n ext4_ext_check\n __ext4_ext_check\n ext4_valid_extent_entries\n Check for overlapping extents does't take effect\n dquot_enable\n vfs_load_quota_inode\n v2_check_quota_file\n v2_read_header\n ext4_quota_read\n ext4_bread\n ext4_getblk\n ext4_map_blocks\n ext4_ext_map_blocks\n ext4_find_extent\n ext4_cache_extents\n ext4_es_cache_extent\n ext4_es_cache_extent\n __es_tree_search\n ext4_es_end\n BUG_ON(es->es_lblk + es->es_len < es->es_lblk)\n\nThe error ext4 extents is as follows:\n0af3 0300 0400 0000 00000000 extent_header\n00000000 0100 0000 12000000 extent1\n00000000 0100 0000 18000000 extent2\n02000000 0400 0000 14000000 extent3\n\nIn the ext4_valid_extent_entries function,\nif prev is 0, no error is returned even if lblock<=prev.\nThis was intended to skip the check on the first extent, but\nin the error image above, prev=0+1-1=0 when checking the second extent,\nso even though lblock<=prev, the function does not return an error.\nAs a result, bug_ON occurs in __es_tree_search and the system panics.\n\nTo solve this problem, we only need to check that:\n1. The lblock of the first extent is not less than 0.\n2. The lblock of the next extent is not less than\n the next block of the previous extent.\nThe same applies to extent_idx."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: se corrige bug_on en __es_tree_search Hulk Robot informó un BUG_ON: ================================================================== kernel BUG at fs/ext4/extents_status.c:199! [...] RIP: 0010:ext4_es_end fs/ext4/extents_status.c:199 [inline] RIP: 0010:__es_tree_search+0x1e0/0x260 fs/ext4/extents_status.c:217 [...] Call Trace: ext4_es_cache_extent+0x109/0x340 fs/ext4/extents_status.c:766 ext4_cache_extents+0x239/0x2e0 fs/ext4/extents.c:561 ext4_find_extent+0x6b7/0xa20 fs/ext4/extents.c:964 ext4_ext_map_blocks+0x16b/0x4b70 fs/ext4/extents.c:4384 ext4_map_blocks+0xe26/0x19f0 fs/ext4/inode.c:567 ext4_getblk+0x320/0x4c0 fs/ext4/inode.c:980 ext4_bread+0x2d/0x170 fs/ext4/inode.c:1031 ext4_quota_read+0x248/0x320 fs/ext4/super.c:6257 v2_read_header+0x78/0x110 fs/quota/quota_v2.c:63 v2_check_quota_file+0x76/0x230 fs/quota/quota_v2.c:82 vfs_load_quota_inode+0x5d1/0x1530 fs/quota/dquot.c:2368 dquot_enable+0x28a/0x330 fs/quota/dquot.c:2490 ext4_quota_enable fs/ext4/super.c:6137 [inline] ext4_enable_quotas+0x5d7/0x960 fs/ext4/super.c:6163 ext4_fill_super+0xa7c9/0xdc00 fs/ext4/super.c:4754 mount_bdev+0x2e9/0x3b0 fs/super.c:1158 mount_fs+0x4b/0x1e4 fs/super.c:1261 [...] ================================================================== Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_enable_quotas ext4_quota_enable ext4_iget __ext4_iget ext4_ext_check_inode ext4_ext_check __ext4_ext_check ext4_valid_extent_entries Check for overlapping extents does't take effect dquot_enable vfs_load_quota_inode v2_check_quota_file v2_read_header ext4_quota_read ext4_bread ext4_getblk ext4_map_blocks ext4_ext_map_blocks ext4_find_extent ext4_cache_extents ext4_es_cache_extent ext4_es_cache_extent __es_tree_search ext4_es_end BUG_ON(es->es_lblk + es->es_len < es->es_lblk) The error ext4 extents is as follows: 0af3 0300 0400 0000 00000000 extent_header 00000000 0100 0000 12000000 extent1 00000000 0100 0000 18000000 extent2 02000000 0400 0000 14000000 extent3 In the ext4_valid_extent_entries function, if prev is 0, no error is returned even if lblock<=prev.. Esto tenía como objetivo omitir la comprobación de la primera extensión, pero en la imagen de error anterior, prev=0+1-1=0 al comprobar la segunda extensión, por lo que, aunque lblock<=prev, la función no devuelve un error. Como resultado, se produce bug_ON en __es_tree_search y el sistema entra en pánico. Para resolver este problema, solo necesitamos comprobar que: 1. El lblock de la primera extensión no sea menor que 0. 2. El lblock de la siguiente extensión no sea menor que el siguiente bloque de la extensión anterior. Lo mismo se aplica a extended_idx."
}
],
"lastModified": "2026-06-17T05:17:58.033",
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