{"id":"CVE-2023-54269","title":"SUNRPC: double free xprt_ctxt while still in use","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: double free xprt_ctxt while still in use\n\nWhen an RPC request is deferred, the rq_xprt_ctxt pointer is moved out\nof the svc_rqst into the svc_deferred_req.\nWhen…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d < 7851771789e87108a92697194105ef0c9307dc5e","Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < fd86534872f445f54dc01e7db001e25eadf063a8","Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < e0c648627322a4c7e018e5c7f837c3c03e297dbb","Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1","Linux 11fab500f86403b2ebf6795feeade6e10302e448","Linux >= 5.15.35 < 5.15.113","Linux >= 5.17.4 < 5.18","Linux 5.18"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-15T21:39:56.402453Z"},"published":"2025-12-30","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:43.730Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54269","references":[{"url":"https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e"},{"url":"https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8"},{"url":"https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb"},{"url":"https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1"}],"tags":["cve.org"],"epss":0.00548,"epssPercentile":0.44538,"ingestedAt":"2026-10-15T22:48:25.437Z","slug":"CVE-2023-54269","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: double free xprt_ctxt while still in use\n\nWhen an RPC request is deferred, the rq_xprt_ctxt pointer is moved out\nof the svc_rqst into the svc_deferred_req.\nWhen the deferred request is revisited, the pointer is copied into\nthe new svc_rqst - and also remains in the svc_deferred_req.\n\nIn the (rare?) case that the request is deferred a second time, the old\nsvc_deferred_req is reused - it still has all the correct content.\nHowever in that case the rq_xprt_ctxt pointer is NOT cleared so that\nwhen xpo_release_xprt is called, the ctxt is freed (UDP) or possible\nadded to a free list (RDMA).\nWhen the deferred request is revisited for a second time, it will\nreference this ctxt which may be invalid, and the free the object a\nsecond time which is likely to oops.\n\nSo change svc_defer() to *always* clear rq_xprt_ctxt, and assert that\nthe value is now stored in the svc_deferred_req.\n\n## Affected\n\n- `Linux >= f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d < 7851771789e87108a92697194105ef0c9307dc5e`\n- `Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < fd86534872f445f54dc01e7db001e25eadf063a8`\n- `Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < e0c648627322a4c7e018e5c7f837c3c03e297dbb`\n- `Linux >= 773f91b2cf3f52df0d7508fdbf60f37567cdaee4 < eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1`\n- `Linux 11fab500f86403b2ebf6795feeade6e10302e448`\n- `Linux >= 5.15.35 < 5.15.113`\n- `Linux >= 5.17.4 < 5.18`\n- `Linux 5.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}