CVE-2023-54269
Unknown Unknown - Not Provided
Double Free Vulnerability in Linux Kernel SUNRPC Component

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-05-07
AI Q&A
2025-12-30
EPSS Evaluated
2026-05-05
NVD
CVE-2023-54269
EUVD
EUVD-2023-60372
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability in the Linux kernel involves a double free of the xprt_ctxt pointer in the SUNRPC subsystem. When an RPC request is deferred, the rq_xprt_ctxt pointer is moved but not properly cleared in certain cases, leading to the pointer being freed twice. This can cause system instability or crashes (kernel oops) because the kernel attempts to free or reuse memory that has already been freed.


How can this vulnerability impact me? :

This vulnerability can lead to system instability or crashes due to double freeing memory in the kernel. This could cause denial of service or unexpected behavior in systems using the affected Linux kernel, potentially impacting availability and reliability.


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