{"id":"CVE-2026-93207","summary":"SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry","details":"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-\u003eclcred, 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.","modified":"2026-09-25T03:48:52.394702681Z","published":"2026-09-24T15:10:30.942Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93207.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0e18641708eaa8bc3c1ff338cd844aeadbd52bac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0fa8a8acae57e6373962741d5b06d13f44aba6a9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/11539e8fcce0b0af062ae5fecf7b3676c2f7aeed"},{"type":"WEB","url":"https://git.kernel.org/stable/c/56b29d62017c7dd1718d060dd5b3a2ce61095d0c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0778464049b0238f2915a40007a4154f86cf351"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93207.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93207"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b0bc53470d1af01f62a0fe2d405cf56477804863"},{"fixed":"56b29d62017c7dd1718d060dd5b3a2ce61095d0c"},{"fixed":"0e18641708eaa8bc3c1ff338cd844aeadbd52bac"},{"fixed":"e0778464049b0238f2915a40007a4154f86cf351"},{"fixed":"0fa8a8acae57e6373962741d5b06d13f44aba6a9"},{"fixed":"11539e8fcce0b0af062ae5fecf7b3676c2f7aeed"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93207.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.3.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93207.json"}}],"schema_version":"1.9.0"}