CVE-2022-49339
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: ipv6: unexport __init-annotated seg6_hmac_init()
EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic.
modpost used to detect it, but it has been broken for a decade.
Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds.
There are two ways to fix it:
I chose the latter for this case because the caller (net/ipv6/seg6.c) and the callee (net/ipv6/seg6_hmac.c) belong to the same module. It seems an internal function call in ipv6.ko.
Detalles técnicos trazas, registros y código del informe original
- Remove __init - Remove EXPORT_SYMBOL
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: 0.28%
- Percentil entre todas las CVEs puntuadas: 18
- 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/1084716f76c8045eadf92a9d9a62641f3c8d8c90
- https://git.kernel.org/stable/c/317260b3eb6384a05a8af212308fa50f3b2e8290
- https://git.kernel.org/stable/c/3e6de5037148c5a93a436b1e8d2edad3dac11755
- https://git.kernel.org/stable/c/5801f064e35181c71857a80ff18af4dbec3c5f5c
- https://git.kernel.org/stable/c/5d9c1b081ad28c852a97e10dd75412546497694a
- https://git.kernel.org/stable/c/64aef8efe96c1616142c4476a05731306fc4494e
- https://git.kernel.org/stable/c/9ba4416b831eeb4d185e88e73488d1d21288e63a
- https://git.kernel.org/stable/c/ab8b2c2de273ec1d698a18e399896a6febb5cda0
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: unexport __init-annotated seg6_hmac_init()\n\nEXPORT_SYMBOL and __init is a bad combination because the .init.text\nsection is freed up after the initialization. Hence, modules cannot\nuse symbols annotated __init. The access to a freed symbol may end up\nwith kernel panic.\n\nmodpost used to detect it, but it has been broken for a decade.\n\nRecently, I fixed modpost so it started to warn it again, then this\nshowed up in linux-next builds.\n\nThere are two ways to fix it:\n\n - Remove __init\n - Remove EXPORT_SYMBOL\n\nI chose the latter for this case because the caller (net/ipv6/seg6.c)\nand the callee (net/ipv6/seg6_hmac.c) belong to the same module.\nIt seems an internal function call in ipv6.ko."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ipv6: unexport __init-annotated seg6_hmac_init() EXPORT_SYMBOL y __init es una mala combinación porque la sección .init.text se libera después de la inicialización. Por lo tanto, los módulos no pueden usar símbolos anotados __init. El acceso a un símbolo liberado puede terminar con un pánico del kernel. modpost solía detectarlo, pero ha estado roto durante una década. Recientemente, arreglé modpost para que comenzara a advertirlo nuevamente, luego esto apareció en las compilaciones de linux-next. Hay dos formas de solucionarlo: - Eliminar __init - Eliminar EXPORT_SYMBOL Elegí esto último para este caso porque el llamador (net/ipv6/seg6.c) y el llamador (net/ipv6/seg6_hmac.c) pertenecen al mismo módulo. Parece una llamada de función interna en ipv6.ko."
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