diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index b05829e44d8f..f7af0286341c 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -874,6 +874,8 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
 	case this value is ignored.
 	Default: between 131072 and 32MB, depending on RAM size.
 
+	Each of the three values cannot be set below 4096.
+
 tcp_sack - BOOLEAN
 	Enable select acknowledgments (SACKS).
 
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 2f0363bca2a8..e3760daa3470 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -51,6 +51,8 @@ static int tcp_ecn_mode_max = 5;
 static u32 icmp_errors_extension_mask_all =
 	GENMASK_U8(ICMP_ERR_EXT_COUNT - 1, 0);
 
+static int tcp_min_rcvbuf = 4096;
+
 /* obsolete */
 static int sysctl_tcp_low_latency __read_mostly;
 
@@ -1462,7 +1464,7 @@ static const struct ctl_table ipv4_net_table[] = {
 		.maxlen		= sizeof(init_net.ipv4.sysctl_tcp_rmem),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ONE,
+		.extra1		= &tcp_min_rcvbuf,
 	},
 	{
 		.procname	= "tcp_comp_sack_delay_ns",