CVE-2023-54269Critical· 9.8▾ MidnightIn 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…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
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.
Linux >= f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d < 7851771789e87108a92697194105ef0c9307dc5eLinux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < fd86534872f445f54dc01e7db001e25eadf063a8Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < e0c648627322a4c7e018e5c7f837c3c03e297dbbLinux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1Linux 11fab500f86403b2ebf6795feeade6e10302e448Linux >= 5.15.35 < 5.15.113Linux >= 5.17.4 < 5.18Linux 5.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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