CVE-2023-54269

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: double free xprt_ctxt while still in use When an RPC request is deferred, the rq_xprt_ctxt pointer is moved out of the svc_rqst into the svc_deferred_req. When the deferred request is revisited, the pointer is copied into the new svc_rqst - and also remains in the svc_deferred_req. In the (rare?) case that the request is deferred a second time, the old svc_deferred_req is reused - it still has all the correct content. However in that case the rq_xprt_ctxt pointer is NOT cleared so that when xpo_release_xprt is called, the ctxt is freed (UDP) or possible added to a free list (RDMA). When the deferred request is revisited for a second time, it will reference this ctxt which may be invalid, and the free the object a second time which is likely to oops. So change svc_defer() to *always* clear rq_xprt_ctxt, and assert that the value is now stored in the svc_deferred_req.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e
https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb
https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1
https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8

Configurations

No configuration.

History

No history.

Information

Published : 2025-12-30 13:16

Updated : 2026-08-04 11:16

NVD link : CVE-2023-54269

Mitre link : CVE-2023-54269

CVE.ORG link : CVE-2023-54269

JSON object : View

Products Affected

No product.

CWE

No CWE.

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and also remains in the svc_deferred_req.\n\nIn the (rare?) case that the request is deferred a second time, the old\nsvc_deferred_req is reused - it still has all the correct content.\nHowever in that case the rq_xprt_ctxt pointer is NOT cleared so that\nwhen xpo_release_xprt is called, the ctxt is freed (UDP) or possible\nadded to a free list (RDMA).\nWhen the deferred request is revisited for a second time, it will\nreference this ctxt which may be invalid, and the free the object a\nsecond time which is likely to oops.\n\nSo change svc_defer() to *always* clear rq_xprt_ctxt, and assert that\nthe value is now stored in the svc_deferred_req."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nSUNRPC: doble liberaci\u00f3n de xprt_ctxt mientras a\u00fan est\u00e1 en uso\n\nCuando una solicitud RPC es diferida, el puntero rq_xprt_ctxt es movido fuera del svc_rqst hacia el svc_deferred_req.\nCuando la solicitud diferida es revisitada, el puntero es copiado en el nuevo svc_rqst - y tambi\u00e9n permanece en el svc_deferred_req.\n\nEn el caso (\u00bfraro?) de que la solicitud sea diferida por segunda vez, el antiguo svc_deferred_req es reutilizado - a\u00fan tiene todo el contenido correcto.\nSin embargo, en ese caso el puntero rq_xprt_ctxt NO es limpiado de modo que cuando se llama a xpo_release_xprt, el ctxt es liberado (UDP) o posiblemente a\u00f1adido a una lista de libres (RDMA).\nCuando la solicitud diferida es revisitada por segunda vez, har\u00e1 referencia a este ctxt el cual puede ser inv\u00e1lido, y liberar\u00e1 el objeto por segunda vez lo que probablemente causar\u00e1 un 'oops'.\n\nAs\u00ed que cambie svc_defer() para *siempre* limpiar rq_xprt_ctxt, y afirme que el valor ahora est\u00e1 almacenado en el svc_deferred_req."}], "lastModified": "2026-08-04T11:16:38.893", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}