sunrpc: defer rq_argp and rq_resp free until after RCU grace period

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89545
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:37 UTC
Updated2026-09-11 20:19:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sunrpc: defer rq_argp and rq_resp free until after RCU grace period svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously via kfree(), but defers the rqstp struct free via kfree_rcu(). After svc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is a window where RCU readers that started before list_del_rcu() can still traverse the thread list and find the rqstp. These readers (e.g. nfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has already been freed — a use-after-free. Fix this by moving the kfree of rq_argp and rq_resp into an explicit call_rcu() callback alongside the struct free. Resources not accessed by RCU readers (bvec, buffer pages, scratch folio, auth_data) remain synchronously freed.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 812443865c5fc255363d4a684a62c086af1addca 08bc49e0541260bf294962cf889a32a2d2713ad6 git Not specified
CNA Linux Linux affected 812443865c5fc255363d4a684a62c086af1addca e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090 git Not specified
CNA Linux Linux affected 812443865c5fc255363d4a684a62c086af1addca c479bde671cbe2f9e152834a8b0eb7c3c295bbaf git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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