Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 812443865c5fc255363d4a684a62c086af1addca before 0ea49d69aa806008b2424c8cf21cf746b9963967; affected 812443865c5fc255363d4a684a62c086af1addca before 08bc49e0541260bf294962cf889a32a2d2713ad6; affected 812443865c5fc255363d4a684a62c086af1addca before e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090; affected 812443865c5fc255363d4a684a62c086af1addca before c479bde671cbe2f9e152834a8b0eb7c3c295bbaf |
| Linux / Linux | affected 3.19; unaffected 0 before 3.19; unaffected 6.12.111 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967
- https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6
- https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090
- https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf
ADP enrichment
No English description supplied.
No references supplied.