diff --git a/drivers/exec/driver.go b/drivers/exec/driver.go
index 7d39c9fe4..7f17ff04f 100644
--- a/drivers/exec/driver.go
+++ b/drivers/exec/driver.go
@@ -265,7 +265,12 @@ func (tc *TaskConfig) validate() error {
 
 func (tc *TaskConfig) validateUserIds(cfg *drivers.TaskConfig, driverConfig *Config) error {
 	usernameToLookup := getUsername(cfg)
-	return validators.HasValidIds(users.Lookup, usernameToLookup, driverConfig.DeniedHostUids, driverConfig.DeniedHostGids)
+	user, err := users.Lookup(usernameToLookup)
+	if err != nil {
+		return fmt.Errorf("failed to identify user %q: %w", usernameToLookup, err)
+	}
+
+	return validators.HasValidIds(user, driverConfig.DeniedHostUids, driverConfig.DeniedHostGids)
 }
 
 // TaskState is the state which is encoded in the handle returned in
diff --git a/drivers/rawexec/driver_unix.go b/drivers/rawexec/driver_unix.go
index 406616165..c5d36f0d7 100644
--- a/drivers/rawexec/driver_unix.go
+++ b/drivers/rawexec/driver_unix.go
@@ -6,6 +6,8 @@
 package rawexec
 
 import (
+	"fmt"
+
 	"github.com/hashicorp/nomad/drivers/shared/validators"
 	"github.com/hashicorp/nomad/helper/users"
 	"github.com/hashicorp/nomad/plugins/drivers"
@@ -25,5 +27,10 @@ func (tc *TaskConfig) Validate(driverCofig Config, cfg drivers.TaskConfig) error
 		usernameToLookup = current.Name
 	}
 
-	return validators.HasValidIds(users.Lookup, usernameToLookup, driverCofig.DeniedHostUids, driverCofig.DeniedHostGids)
+	user, err := users.Lookup(usernameToLookup)
+	if err != nil {
+		return fmt.Errorf("failed to identify user %q: %w", usernameToLookup, err)
+	}
+
+	return validators.HasValidIds(user, driverCofig.DeniedHostUids, driverCofig.DeniedHostGids)
 }
diff --git a/drivers/shared/validators/validators.go b/drivers/shared/validators/validators.go
index e8842ecca..f48ab759c 100644
--- a/drivers/shared/validators/validators.go
+++ b/drivers/shared/validators/validators.go
@@ -1,8 +1,6 @@
 // Copyright (c) HashiCorp, Inc.
 // SPDX-License-Identifier: MPL-2.0
 
-//go:build !windows
-
 package validators
 
 import (
@@ -36,21 +34,12 @@ func ParseIdRange(rangeType string, deniedRanges string) ([]structs.IDRange, err
 	return idRanges, nil
 }
 
-type userLookupFn func(string) (*user.User, error)
-
 // HasValidIds is used when running a task to ensure the
 // given user is in the ID range defined in the task config
-func HasValidIds(userLookupFn userLookupFn, usernameToLookup string, deniedHostUIDs, deniedHostGIDs []structs.IDRange) error {
-
-	// look up user on host given username
-
-	u, err := userLookupFn(usernameToLookup)
+func HasValidIds(user *user.User, deniedHostUIDs, deniedHostGIDs []structs.IDRange) error {
+	uid, err := strconv.ParseUint(user.Uid, 10, 32)
 	if err != nil {
-		return fmt.Errorf("failed to identify user %q: %w", usernameToLookup, err)
-	}
-	uid, err := strconv.ParseUint(u.Uid, 10, 32)
-	if err != nil {
-		return fmt.Errorf("unable to convert userid %s to integer", u.Uid)
+		return fmt.Errorf("unable to convert userid %s to integer", user.Uid)
 	}
 
 	// check uids
@@ -63,7 +52,7 @@ func HasValidIds(userLookupFn userLookupFn, usernameToLookup string, deniedHostU
 
 	// check gids
 
-	gidStrings, err := u.GroupIds()
+	gidStrings, err := user.GroupIds()
 	if err != nil {
 		return fmt.Errorf("unable to lookup user's group membership: %w", err)
 	}
diff --git a/drivers/shared/validators/validators_test.go b/drivers/shared/validators/validators_test.go
index bd7b8b08c..2a5e4813b 100644
--- a/drivers/shared/validators/validators_test.go
+++ b/drivers/shared/validators/validators_test.go
@@ -1,8 +1,6 @@
 // Copyright (c) HashiCorp, Inc.
 // SPDX-License-Identifier: MPL-2.0
 
-//go:build !windows
-
 package validators
 
 import (
@@ -63,13 +61,12 @@ func Test_HasValidIds(t *testing.T) {
 	validRangesList := []structs.IDRange{validRange, validRangeSingle}
 
 	testCases := []struct {
-		name           string
-		uidRanges      []structs.IDRange
-		gidRanges      []structs.IDRange
-		uid            string
-		gid            string
-		expectedErr    string
-		userLookupFunc userLookupFn
+		name        string
+		uidRanges   []structs.IDRange
+		gidRanges   []structs.IDRange
+		uid         string
+		gid         string
+		expectedErr string
 	}{
 		{name: "no-ranges-are-valid", uidRanges: validRangesList, gidRanges: emptyRanges},
 		{name: "uid-and-gid-outside-of-ranges-valid", uidRanges: validRangesList, gidRanges: validRangesList},
@@ -80,24 +77,20 @@ func Test_HasValidIds(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			defaultUserToReturn := &user.User{
+			user := &user.User{
 				Uid: "200",
 				Gid: "200",
 			}
 
 			if tc.uid != "" {
-				defaultUserToReturn.Uid = tc.uid
+				user.Uid = tc.uid
 			}
 
 			if tc.gid != "" {
-				defaultUserToReturn.Gid = tc.gid
+				user.Gid = tc.gid
 			}
 
-			getUserFn := func(username string) (*user.User, error) {
-				return defaultUserToReturn, nil
-			}
-
-			err := HasValidIds(getUserFn, "username", tc.uidRanges, tc.gidRanges)
+			err := HasValidIds(user, tc.uidRanges, tc.gidRanges)
 			if tc.expectedErr == "" {
 				must.NoError(t, err)
 			} else {