CVE-2025-21635
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The per-netns structure can be obtained from the table->data using container_of(), then the 'net' one can be retrieved from the listen socket (if available).
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-01-19 11:15:09
Last modified
2026-10-30 13:17:50.720000
View original CVE JSON
{
"id": "CVE-2025-21635",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-01-19T11:15:09.000",
"lastModified": "2026-10-30T13:17:50.720",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n syzbot [1] using acct(2).\n\nThe per-netns structure can be obtained from the table->data using\ncontainer_of(), then the 'net' one can be retrieved from the listen\nsocket (if available)."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rds: sysctl: rds_tcp_{rcv,snd}buf: evitar usar current->nsproxy Como se mencionó en un commit anterior de esta serie, no se recomienda usar la estructura 'net' a través de 'current' por diferentes razones: - Inconsistencia: obtener información de los netns del lector/escritor vs solo de los netns del abridor. - current->nsproxy puede ser NULL en algunos casos, lo que resulta en un 'Oops' (null-ptr-deref), p. ej. cuando la tarea actual está saliendo, como lo detectó syzbot [1] usando acct(2). La estructura per-netns se puede obtener de table->data usando Container_of(), luego la 'net' se puede recuperar del socket de escucha (si está disponible)."
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