{"id":"CVE-2026-93207","revision":"139372ac99694f198eba255ec5a01912","records":[{"revision":"139372ac99694f198eba255ec5a01912","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93207","aliases":[],"title":"SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry\n\nsvcauth_gss_decode_credbody() writes the caller's\nrpc_gss_wire_cred field by field and assigns gc_ctx.len only on\nthe success tail.  The caller storage is svcdata->clcred, which\nlives in the per-svc_rqst gss_svc_data and is reused across\nrequests.  Early decode failures leave partially decoded state\nmixed with residue from the prior request.\n\nThe trailing body_len tightness check is the sharpest case:\nxdr_stream_decode_opaque_inline() has already written gc_ctx.data\nwith a borrowed inline pointer into the current request's XDR\npages, but gc_ctx.len retains its prior value.  Once the request\npages are released the pooled clcred carries a dangling pointer\npaired with a stale length.\n\nZero the caller's rpc_gss_wire_cred at function entry so that\nevery early-return path leaves a deterministic all-zero cred.\nOn the trailing tightness-check path, gc_ctx.len is now zero\ninstead of stale, which neuters length-driven consumers such as\ngss_svc_searchbyctx() that would otherwise walk the dangling\ndata pointer.","state":0,"publishedAt":"2026-09-24T15:10:30.942+00:00","modifiedAt":"2026-10-19T09:07:19.48+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/auth_gss/svcauth_gss.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b0bc53470d1af01f62a0fe2d405cf56477804863\",\n                            \"lessThan\": \"56b29d62017c7dd1718d060dd5b3a2ce61095d0c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b0bc53470d1af01f62a0fe2d405cf56477804863\",\n                            \"lessThan\": \"0e18641708eaa8bc3c1ff338cd844aeadbd52bac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b0bc53470d1af01f62a0fe2d405cf56477804863\",\n                            \"lessThan\": \"e0778464049b0238f2915a40007a4154f86cf351\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b0bc53470d1af01f62a0fe2d405cf56477804863\",\n                            \"lessThan\": \"0fa8a8acae57e6373962741d5b06d13f44aba6a9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b0bc53470d1af01f62a0fe2d405cf56477804863\",\n                            \"lessThan\": \"11539e8fcce0b0af062ae5fecf7b3676c2f7aeed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/auth_gss/svcauth_gss.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/56b29d62017c7dd1718d060dd5b3a2ce61095d0c","https://git.kernel.org/stable/c/0e18641708eaa8bc3c1ff338cd844aeadbd52bac","https://git.kernel.org/stable/c/e0778464049b0238f2915a40007a4154f86cf351","https://git.kernel.org/stable/c/0fa8a8acae57e6373962741d5b06d13f44aba6a9","https://git.kernel.org/stable/c/11539e8fcce0b0af062ae5fecf7b3676c2f7aeed"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93207","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93207","identifiers":["CVE-2026-93207"]},"retained":false,"historicalAffected":[]}],"coverage":[]}