CVE-2026-89545
CVE CVE-2026-89545EUVD EUVD-2026-76456Published 2026-09-11T19:44:21.000ZLast changed 2026-09-13T06:30:44.000ZCVSS 7.8
What the advisory describes
In 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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 3.19; patch: 7.2.4; 812443865c5fc255363d4a684a62c086af1addca <e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090; 812443865c5fc255363d4a684a62c086af1addca <c479bde671cbe2f9e152834a8b0eb7c3c295bbaf; 812443865c5fc255363d4a684a62c086af1addca <08bc49e0541260bf294962cf889a32a2d2713ad6; patch: 6.18.50; patch: 0; patch: 7.3-rc1
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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