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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12Upgrade kernel6.12-tools-develUpgrade kernel6.12-modules-extra-commonUpgrade python3-perf6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade bpftool6.12Upgrade kernel6.12-toolsUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade perf6.12Upgrade python3-perf6.12-debuginfoUpgrade kernel-livepatch-6.12.111-136.204Upgrade kernel6.12-develUpgrade kernel6.12-headersUpgrade kernel6.12-tools-debuginfoUpgrade perf6.12-debuginfo | Oct 13, 2026 | Sep 11, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 11, 2026 |
| Redhat_linux | — | No solution exists | Sep 21, 2026 | Sep 11, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 11, 2026 |
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