CVE-2023-54269

SUNRPC: double free xprt_ctxt while still in use

State: Published
Severity: 9.8 Critical
Published: Dec 30, 2025
Updated: Oct 15, 2026
Reserved: Dec 30, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d to before 7851771789e87108a92697194105ef0c9307dc5eAffected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 to before fd86534872f445f54dc01e7db001e25eadf063a8Affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 to before e0c648627322a4c7e018e5c7f837c3c03e297dbbAffected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 to before eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1Affected 11fab500f86403b2ebf6795feeade6e10302e448Affected 5.15.35 to before 5.15.113Affected 5.17.4 to before 5.18Affected
LinuxLinux	5.18Affected before 5.18Not affected 5.15.113 through 5.15.Not affected 6.1.30 through 6.1.Not affected 6.3.4 through 6.3.*Not affected 6.4 and laterNot affected

Product

Versions

LinuxLinux

f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d to before 7851771789e87108a92697194105ef0c9307dc5eAffected
773f91b2cf3f52df0d7508fdbf60f37567cdaee4 to before fd86534872f445f54dc01e7db001e25eadf063a8Affected
773f91b2cf3f52df0d7508fdbf60f37567cdaee4 to before e0c648627322a4c7e018e5c7f837c3c03e297dbbAffected
773f91b2cf3f52df0d7508fdbf60f37567cdaee4 to before eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1Affected
11fab500f86403b2ebf6795feeade6e10302e448Affected
5.15.35 to before 5.15.113Affected
5.17.4 to before 5.18Affected

LinuxLinux

5.18Affected
before 5.18Not affected
5.15.113 through 5.15.*Not affected
6.1.30 through 6.1.*Not affected
6.3.4 through 6.3.*Not affected
6.4 and laterNot affected

References

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