Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: double free xprt_ctxt while still in use When an RPC request is deferred, the rq_xprt_ctxt pointer is moved out of the svc_rqst into the svc_deferred_req. When the deferred request is revisited, the pointer is copied into the new svc_rqst - and also remains in the svc_deferred_req. In the (rare?) case that the request is deferred a second time, the old svc_deferred_req is reused - it still has all the correct content. However in that case the rq_xprt_ctxt pointer is NOT cleared so that when xpo_release_xprt is called, the ctxt is freed (UDP) or possible added to a free list (RDMA). When the deferred request is revisited for a second time, it will reference this ctxt which may be invalid, and the free the object a second time which is likely to oops. So change svc_defer() to *always* clear rq_xprt_ctxt, and assert that the value is now stored in the svc_deferred_req.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d before 7851771789e87108a92697194105ef0c9307dc5e; affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 before fd86534872f445f54dc01e7db001e25eadf063a8; affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 before e0c648627322a4c7e018e5c7f837c3c03e297dbb; affected 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 before eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1; affected 11fab500f86403b2ebf6795feeade6e10302e448; affected 5.15.35 before 5.15.113; affected 5.17.4 before 5.18 |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 5.15.113 through 5.15.*; unaffected 6.1.30 through 6.1.*; unaffected 6.3.4 through 6.3.*; unaffected 6.4 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e
- https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8
- https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb
- https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1
ADP enrichment
No English description supplied.
No references supplied.