CVE-2026-49415
Full vulnerability record from the local CVENow database.
Description
During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials. An unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system.
Severity
HIGH
CVSS score
8.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-08-19 05:17:03.830000
Last modified
2026-11-05 21:10:00.183000
View original CVE JSON
{
"id": "CVE-2026-49415",
"sourceIdentifier": "[email protected]",
"published": "2026-08-19T05:17:03.830",
"lastModified": "2026-11-05T21:10:00.183",
"vulnStatus": "Analyzed",
"cveTags": [],
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"value": "During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials.\n\nAn unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system."
},
{
"lang": "es",
"value": "Durante execve(2) de un binario SUID, el nuevo espacio de direcciones virtual se instala antes de que se actualicen las credenciales del proceso. Durante esta ventana, un proceso ejecutándose como el mismo usuario puede acceder a la memoria del proceso objetivo a través de procfs o linprocfs, porque la verificación de permisos de depuración del kernel aún veía las credenciales originales.\n\nUn usuario local sin privilegios puede explotar esta condición de carrera para modificar el espacio de direcciones de un binario SUID antes de que sus credenciales sean elevadas, obteniendo potencialmente el control total del sistema afectado."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "FreeBSD",
"product": "FreeBSD",
"defaultStatus": "unknown",
"modules": [
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"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
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"id": "CVE-2026-49415",
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"description": [
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"references": [
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"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:39.execve.asc",
"source": "[email protected]",
"tags": [
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}
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}