SUNRPC: double free xprt_ctxt while still in use

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-54269
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-30 13:16:15 UTC
Updated2026-10-15 22:17:57 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.004750000 probability, percentile 0.385960000 (date 2026-08-06)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d 7851771789e87108a92697194105ef0c9307dc5e git Not specified
CNA Linux Linux affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 fd86534872f445f54dc01e7db001e25eadf063a8 git Not specified
CNA Linux Linux affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 e0c648627322a4c7e018e5c7f837c3c03e297dbb git Not specified
CNA Linux Linux affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1 git Not specified
CNA Linux Linux affected 11fab500f86403b2ebf6795feeade6e10302e448 git Not specified
CNA Linux Linux affected 5.15.35 5.15.113 semver Not specified
CNA Linux Linux affected 5.17.4 5.18 semver Not specified
CNA Linux Linux affected 5.18 Not specified
CNA Linux Linux unaffected 5.18 semver Not specified
CNA Linux Linux unaffected 5.15.113 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.30 6.1.* semver Not specified
CNA Linux Linux unaffected 6.3.4 6.3.* semver Not specified
CNA Linux Linux unaffected 6.4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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