{"id":"CVE-2026-93207","title":"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…","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 < 56b29d62017c7dd1718d060dd5b3a2ce61095d0c","Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 < 0e18641708eaa8bc3c1ff338cd844aeadbd52bac","Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 < e0778464049b0238f2915a40007a4154f86cf351","Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 < 0fa8a8acae57e6373962741d5b06d13f44aba6a9","Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 < 11539e8fcce0b0af062ae5fecf7b3676c2f7aeed","Linux 6.3"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T16:17:15.357","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93207","references":[{"url":"https://git.kernel.org/stable/c/0e18641708eaa8bc3c1ff338cd844aeadbd52bac","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0fa8a8acae57e6373962741d5b06d13f44aba6a9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/11539e8fcce0b0af062ae5fecf7b3676c2f7aeed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/56b29d62017c7dd1718d060dd5b3a2ce61095d0c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e0778464049b0238f2915a40007a4154f86cf351","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T15:45:56.673Z","slug":"CVE-2026-93207","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}