CVE-2025-38165
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Fix panic when calling skb_linearize
The panic can be reproduced by executing the command: ./bench sockmap -c 2 -p 1 -a --rx-verdict-ingress --rx-strp 100000
The panic originates from the assertion BUG_ON(skb_shared(skb)) in skb_linearize(). A previous commit(see Fixes tag) introduced skb_get() to avoid race conditions between skb operations in the backlog and skb release in the recvmsg path. However, this caused the panic to always occur when skb_linearize is executed.
The "--rx-strp 100000" parameter forces the RX path to use the strparser module which aggregates data until it reaches 100KB before calling sockmap logic. The 100KB payload exceeds MAX_MSG_FRAGS, triggering skb_linearize.
Leer descripción completaMostrar menos
To fix this issue, just move skb_get into sk_psock_skb_ingress_enqueue.
Note that for verdict_apply path, the skb_get operation is unnecessary so we add 'take_ref' param to control it's behavior.
Detalles técnicos trazas, registros y código del informe original
Then a kernel panic was captured:
'''
[ 657.460555] kernel BUG at net/core/skbuff.c:2178!
[ 657.462680] Tainted: [W]=WARN
[ 657.463287] Workqueue: events sk_psock_backlog
...
[ 657.469610] <TASK>
[ 657.469738] ? die+0x36/0x90
[ 657.469916] ? do_trap+0x1d0/0x270
[ 657.470118] ? pskb_expand_head+0x612/0xf40
[ 657.470376] ? pskb_expand_head+0x612/0xf40
[ 657.470620] ? do_error_trap+0xa3/0x170
[ 657.470846] ? pskb_expand_head+0x612/0xf40
[ 657.471092] ? handle_invalid_op+0x2c/0x40
[ 657.471335] ? pskb_expand_head+0x612/0xf40
[ 657.471579] ? exc_invalid_op+0x2d/0x40
[ 657.471805] ? asm_exc_invalid_op+0x1a/0x20
[ 657.472052] ? pskb_expand_head+0xd1/0xf40
[ 657.472292] ? pskb_expand_head+0x612/0xf40
[ 657.472540] ? lock_acquire+0x18f/0x4e0
[ 657.472766] ? find_held_lock+0x2d/0x110
[ 657.472999] ? __pfx_pskb_expand_head+0x10/0x10
[ 657.473263] ? __kmalloc_cache_noprof+0x5b/0x470
[ 657.473537] ? __pfx___lock_release.isra.0+0x10/0x10
[ 657.473826] __pskb_pull_tail+0xfd/0x1d20
[ 657.474062] ? __kasan_slab_alloc+0x4e/0x90
[ 657.474707] sk_psock_skb_ingress_enqueue+0x3bf/0x510
[ 657.475392] ? __kasan_kmalloc+0xaa/0xb0
[ 657.476010] sk_psock_backlog+0x5cf/0xd70
[ 657.476637] process_one_work+0x858/0x1a20
'''
'''
sk_psock_backlog:
sk_psock_handle_skb
skb_get(skb) <== we move it into 'sk_psock_skb_ingress_enqueue'
sk_psock_skb_ingress____________
↓
|
| → sk_psock_skb_ingress_self
| sk_psock_skb_ingress_enqueue
sk_psock_verdict_apply_________________↑ skb_linearize
'''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: 0.35%
- Percentil entre todas las CVEs puntuadas: 26
- 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 (2)
CWE
- CWE-401
Referencias
- https://git.kernel.org/stable/c/3d25fa2d7f127348c818e1dab9e58534f7ac56cc
- https://git.kernel.org/stable/c/4dba44333a11522df54b49aa1f2edfaf6ce35fc7
- https://git.kernel.org/stable/c/5ca2e29f6834c64c0e5a9ccf1278c21fb49b827e
- https://git.kernel.org/stable/c/9718ba6490732dbe70190d42c21deb1440834402
- https://git.kernel.org/stable/c/db1d15a26f21f97459508c42ae87cabe8d3afc3b
- https://git.kernel.org/stable/c/e9c1299d813fc04668042690f2c3cc76d013959a
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix panic when calling skb_linearize\n\nThe panic can be reproduced by executing the command:\n./bench sockmap -c 2 -p 1 -a --rx-verdict-ingress --rx-strp 100000\n\nThen a kernel panic was captured:\n'''\n[ 657.460555] kernel BUG at net/core/skbuff.c:2178!\n[ 657.462680] Tainted: [W]=WARN\n[ 657.463287] Workqueue: events sk_psock_backlog\n...\n[ 657.469610] <TASK>\n[ 657.469738] ? die+0x36/0x90\n[ 657.469916] ? do_trap+0x1d0/0x270\n[ 657.470118] ? pskb_expand_head+0x612/0xf40\n[ 657.470376] ? pskb_expand_head+0x612/0xf40\n[ 657.470620] ? do_error_trap+0xa3/0x170\n[ 657.470846] ? pskb_expand_head+0x612/0xf40\n[ 657.471092] ? handle_invalid_op+0x2c/0x40\n[ 657.471335] ? pskb_expand_head+0x612/0xf40\n[ 657.471579] ? exc_invalid_op+0x2d/0x40\n[ 657.471805] ? asm_exc_invalid_op+0x1a/0x20\n[ 657.472052] ? pskb_expand_head+0xd1/0xf40\n[ 657.472292] ? pskb_expand_head+0x612/0xf40\n[ 657.472540] ? lock_acquire+0x18f/0x4e0\n[ 657.472766] ? find_held_lock+0x2d/0x110\n[ 657.472999] ? __pfx_pskb_expand_head+0x10/0x10\n[ 657.473263] ? __kmalloc_cache_noprof+0x5b/0x470\n[ 657.473537] ? __pfx___lock_release.isra.0+0x10/0x10\n[ 657.473826] __pskb_pull_tail+0xfd/0x1d20\n[ 657.474062] ? __kasan_slab_alloc+0x4e/0x90\n[ 657.474707] sk_psock_skb_ingress_enqueue+0x3bf/0x510\n[ 657.475392] ? __kasan_kmalloc+0xaa/0xb0\n[ 657.476010] sk_psock_backlog+0x5cf/0xd70\n[ 657.476637] process_one_work+0x858/0x1a20\n'''\n\nThe panic originates from the assertion BUG_ON(skb_shared(skb)) in\nskb_linearize(). A previous commit(see Fixes tag) introduced skb_get()\nto avoid race conditions between skb operations in the backlog and skb\nrelease in the recvmsg path. However, this caused the panic to always\noccur when skb_linearize is executed.\n\nThe \"--rx-strp 100000\" parameter forces the RX path to use the strparser\nmodule which aggregates data until it reaches 100KB before calling sockmap\nlogic. The 100KB payload exceeds MAX_MSG_FRAGS, triggering skb_linearize.\n\nTo fix this issue, just move skb_get into sk_psock_skb_ingress_enqueue.\n\n'''\nsk_psock_backlog:\n sk_psock_handle_skb\n skb_get(skb) <== we move it into 'sk_psock_skb_ingress_enqueue'\n sk_psock_skb_ingress____________\n ↓\n |\n | → sk_psock_skb_ingress_self\n | sk_psock_skb_ingress_enqueue\nsk_psock_verdict_apply_________________↑ skb_linearize\n'''\n\nNote that for verdict_apply path, the skb_get operation is unnecessary so\nwe add 'take_ref' param to control it's behavior."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, sockmap: Se corrige el pánico al llamar a skb_linearize El pánico se puede reproducir ejecutando el comando: ./bench sockmap -c 2 -p 1 -a --rx-verdict-ingress --rx-strp 100000 Luego se capturó un pánico del kernel: ''' [ 657.460555] kernel BUG at net/core/skbuff.c:2178! [ 657.462680] Tainted: [W]=WARN [ 657.463287] Workqueue: events sk_psock_backlog ... [ 657.469610] [ 657.469738] ? die+0x36/0x90 [ 657.469916] ? do_trap+0x1d0/0x270 [ 657.470118] ? pskb_expand_head+0x612/0xf40 [ 657.470376] ? pskb_expand_head+0x612/0xf40 [ 657.470620] ? do_error_trap+0xa3/0x170 [ 657.470846] ? pskb_expand_head+0x612/0xf40 [ 657.471092] ? handle_invalid_op+0x2c/0x40 [ 657.471335] ? pskb_expand_head+0x612/0xf40 [ 657.471579] ? exc_invalid_op+0x2d/0x40 [ 657.471805] ? asm_exc_invalid_op+0x1a/0x20 [ 657.472052] ? pskb_expand_head+0xd1/0xf40 [ 657.472292] ? pskb_expand_head+0x612/0xf40 [ 657.472540] ? lock_acquire+0x18f/0x4e0 [ 657.472766] ? find_held_lock+0x2d/0x110 [ 657.472999] ? __pfx_pskb_expand_head+0x10/0x10 [ 657.473263] ? __kmalloc_cache_noprof+0x5b/0x470 [ 657.473537] ? __pfx___lock_release.isra.0+0x10/0x10 [ 657.473826] __pskb_pull_tail+0xfd/0x1d20 [ 657.474062] ? __kasan_slab_alloc+0x4e/0x90 [ 657.474707] sk_psock_skb_ingress_enqueue+0x3bf/0x510 [ 657.475392] ? __kasan_kmalloc+0xaa/0xb0 [ 657.476010] sk_psock_backlog+0x5cf/0xd70 [ 657.476637] process_one_work+0x858/0x1a20 ''' El pánico se origina en la aserción BUG_ON(skb_shared(skb)) en skb_linearize(). Una confirmación anterior (véase la etiqueta \"Correcciones\") introdujo skb_get() para evitar condiciones de ejecución entre las operaciones de skb en el backlog y la versión de skb en la ruta recvmsg. Sin embargo, esto provocaba que el pánico siempre se produjera al ejecutar skb_linearize. El parámetro \"--rx-strp 100000\" obliga a la ruta RX a usar el módulo strparser, que agrega datos hasta alcanzar los 100 KB antes de llamar a la lógica de sockmap. El payload de 100 KB supera MAX_MSG_FRAGS, lo que activa skb_linearize. Para solucionar este problema, simplemente mueva skb_get a sk_psock_skb_ingress_enqueue. ''' sk_psock_backlog: sk_psock_handle_skb skb_get(skb) <== lo movemos a 'sk_psock_skb_ingress_enqueue' sk_psock_skb_ingress____________ ? | | ? sk_psock_skb_ingress_self | sk_psock_skb_ingress_enqueue sk_psock_verdict_apply_________________? skb_linearize ''' Tenga en cuenta que para la ruta verdict_apply, la operación skb_get es innecesaria, por lo que añadimos el parámetro 'take_ref' para controlar su comportamiento."
}
],
"lastModified": "2026-07-30T06:22:56.253",
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