diff --git a/pkgs/os-specific/linux/kernel-headers/default.nix b/pkgs/os-specific/linux/kernel-headers/default.nix
index e0a3c4319b8b..652468002775 100644
--- a/pkgs/os-specific/linux/kernel-headers/default.nix
+++ b/pkgs/os-specific/linux/kernel-headers/default.nix
@@ -111,18 +111,15 @@ let
 in {
   inherit makeLinuxHeaders;
 
-  linuxHeaders = let version = "6.5"; in
+  linuxHeaders = let version = "6.6"; in
     makeLinuxHeaders {
       inherit version;
       src = fetchurl {
         url = "mirror://kernel/linux/kernel/v${lib.versions.major version}.x/linux-${version}.tar.xz";
-        hash = "sha256-eldLvCCALqdrUsp/rwcmf3IEXoYbGJFcUnKpjCer+IQ=";
+        hash = "sha256-2SagbGPdisffP4buH/ws4qO4Gi0WhITna1s4mrqOVtA=";
       };
       patches = [
         ./no-relocs.patch # for building x86 kernel headers on non-ELF platforms
-
-        # Fix regression turning `struct sockaddr_ll` flexible size.
-        ./revert-af_packet-flex.patch
       ];
     };
 }
diff --git a/pkgs/os-specific/linux/kernel-headers/revert-af_packet-flex.patch b/pkgs/os-specific/linux/kernel-headers/revert-af_packet-flex.patch
deleted file mode 100644
index ed6c8861d2fb..000000000000
--- a/pkgs/os-specific/linux/kernel-headers/revert-af_packet-flex.patch
+++ /dev/null
@@ -1,31 +0,0 @@
-Revert commit https://github.com/torvalds/linux/commit/a0ade8404c3bc2bf2631cb0f20d372eed22d9d96
-
-The change caused API regression by turning fixed size struct to
-flexible size struct. It was an unintentional change, broke `udp2raw`:
-    https://github.com/NixOS/nixpkgs/pull/252587#issuecomment-1744427473
---- a/include/uapi/linux/if_packet.h
-+++ b/include/uapi/linux/if_packet.h
-@@ -18,11 +18,7 @@ struct sockaddr_ll {
- 	unsigned short	sll_hatype;
- 	unsigned char	sll_pkttype;
- 	unsigned char	sll_halen;
--	union {
--		unsigned char	sll_addr[8];
--		/* Actual length is in sll_halen. */
--		__DECLARE_FLEX_ARRAY(unsigned char, sll_addr_flex);
--	};
-+	unsigned char	sll_addr[8];
- };
- 
- /* Packet types */
---- a/net/packet/af_packet.c
-+++ b/net/packet/af_packet.c
-@@ -3607,7 +3607,7 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
- 	if (dev) {
- 		sll->sll_hatype = dev->type;
- 		sll->sll_halen = dev->addr_len;
--		memcpy(sll->sll_addr_flex, dev->dev_addr, dev->addr_len);
-+		memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
- 	} else {
- 		sll->sll_hatype = 0;	/* Bad: we have no ARPHRD_UNSPEC */
- 		sll->sll_halen = 0;