CVE-2026-89545

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.

• https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6
• https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967
• https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf
• https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090

Published

Sep 11, 2026

Last Modified

Sep 21, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-8954Incorrect boundary conditions, integer overflow in the Audio…7.5
• CVE-2026-89540In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-89541In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-89542In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-89543In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89544In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-89546In the Linux kernel, the following vulnerability has been re…9.8
• CVE-2026-89547In the Linux kernel, the following vulnerability has been re…8.1
• CVE-2026-89548In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-89549In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-8955Privilege escalation in the DOM: Workers component. This vul…8.8
• CVE-2026-89550In the Linux kernel, the following vulnerability has been re…9.8