{"cve":"CVE-2026-93207","nvd":{"published":"2026-09-24T16:17:15.357","modified":"2026-10-19T10:17:11.487","status":"Received","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":[],"references":["https://git.kernel.org/stable/c/0e18641708eaa8bc3c1ff338cd844aeadbd52bac","https://git.kernel.org/stable/c/0fa8a8acae57e6373962741d5b06d13f44aba6a9","https://git.kernel.org/stable/c/11539e8fcce0b0af062ae5fecf7b3676c2f7aeed","https://git.kernel.org/stable/c/56b29d62017c7dd1718d060dd5b3a2ce61095d0c","https://git.kernel.org/stable/c/e0778464049b0238f2915a40007a4154f86cf351"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-93207","score":0.00467,"percentile":0.40151,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}