DEBIAN-CVE-2026-93207

In the Linux kernel, the following vulnerability has been resolved:  SUNRPC: Zero rpcgsswirecred at svcauthgssdecodecredbody() entry  svcauthgssdecodecredbody() writes the caller's rpcgsswirecred field by field and assigns gcctx.len only on the success tail.  The caller storage is svcdata->clcred, which lives in the per-svcrqst gsssvcdata and is reused across requests.  Early decode failures leave partially decoded state mixed with residue from the prior request.  The trailing bodylen tightness check is the sharpest case: xdrstreamdecodeopaqueinline() has already written gcctx.data with a borrowed inline pointer into the current request's XDR pages, but gcctx.len retains its prior value.  Once the request pages are released the pooled clcred carries a dangling pointer paired with a stale length.  Zero the caller's rpcgsswirecred at function entry so that every early-return path leaves a deterministic all-zero cred. On the trailing tightness-check path, gcctx.len is now zero instead of stale, which neuters length-driven consumers such as gsssvc_searchbyctx() that would otherwise walk the dangling data pointer.