diff --git a/sys-fs/zfs-kmod/Manifest b/sys-fs/zfs-kmod/Manifest
index 26a0d3553f142..afe0a2c2a7ad1 100644
--- a/sys-fs/zfs-kmod/Manifest
+++ b/sys-fs/zfs-kmod/Manifest
@@ -12,3 +12,5 @@ DIST zfs-2.3.4.tar.gz 34386899 BLAKE2B e7619445a9138475e51e1578cb4e85032570830fa
 DIST zfs-2.3.4.tar.gz.asc 858 BLAKE2B 2537afa40b48c07b8ad61a4f6973e40a78b5863afbb6b75674fb7a5950ba2dda22dfa93a180190332d234b0b2e2ce14ed61cb34bc0f56e609dad3cdb805ab5c2 SHA512 cc50fb915d4e8a7eb894bdf919940a8c68828e48a5e1f2a08b08a5e75c0eb8a9cd4feaa84742b65d6b2d85ee839ac2b7d565ed7958006ff079d751145463243b
 DIST zfs-2.4.0-rc1.tar.gz 34294259 BLAKE2B 262a510a356c515692d03ce2f5bdb61bb051d04ac79cc7723a2944e9f99f5514e2749752901e202f6bb8edd560e3639b845e790d9b861271265fe04cbe0178ce SHA512 9e8a95d98c311ee6efc8a2aa3f6e97a1573f247bbdbf9f11e0f981f8b768b45337b229d3c17fe7bc40bb67d8f0cc0fc77ab4138c29d3ae3d86eaff54bad84700
 DIST zfs-2.4.0-rc1.tar.gz.asc 858 BLAKE2B 5fb794647fe89bc0b4030c273d50a2a8fcefb7e53a088f16fcdfba8d90aa3a011eb6c779e83c9a2bde2c6247a10bdca4245832c89886af8f5a1e7732b8a0fc3a SHA512 0083069492028f188ae015f99939cdde9458e29fee1e3fc848049488ed534fa7f2c557ddb7f83b7155bb29f8b98530c13b64f177fb40a741c3251a68890fa9ce
+DIST zfs-2.4.0-rc2.tar.gz 34315284 BLAKE2B 6c72d5e86e93d28fd5204ac4c38175d97b564b671cf71045c94f4b9b19ae36a439000fd55761220a0a17adf9fd9b6df6b367831442c079b0bff1e01a3299baab SHA512 7fa6caecc6818af17bdc104624eb7638a6c41bfca03a5b45ce996e7bbf8bfd1b06a54714ca7cb59ac70b061cb0eb11bc68868f786a502f427775f1bcfe1a5de0
+DIST zfs-2.4.0-rc2.tar.gz.asc 858 BLAKE2B 1bdad0ca1fcccae5e74187a88b3352ab8834c15c0933ddedc5562866dc3657ea575db5f788243fe7decc2f58b5470193ae422dec377447e9ffe75c5773378cda SHA512 e0de554bb62b2ee840a3cac2022b91ed83d2572d0ea73d2b5941308e94abf8d2c4d0f50b1bcc309880e0b415963bb6511664fa31601f0290ce9bb9ed79671a65
diff --git a/sys-fs/zfs-kmod/zfs-kmod-2.4.0_rc2.ebuild b/sys-fs/zfs-kmod/zfs-kmod-2.4.0_rc2.ebuild
new file mode 100644
index 0000000000000..6f130dc298568
--- /dev/null
+++ b/sys-fs/zfs-kmod/zfs-kmod-2.4.0_rc2.ebuild
@@ -0,0 +1,207 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+MODULES_INITRAMFS_IUSE=+initramfs
+inherit autotools flag-o-matic linux-mod-r1 multiprocessing
+
+DESCRIPTION="Linux ZFS kernel module for sys-fs/zfs"
+HOMEPAGE="https://github.com/openzfs/zfs"
+
+MODULES_KERNEL_MAX=6.16
+MODULES_KERNEL_MIN=4.18
+
+if [[ ${PV} == 9999 ]] ; then
+	EGIT_REPO_URI="https://github.com/openzfs/zfs.git"
+	inherit git-r3
+	unset MODULES_KERNEL_MAX
+else
+	VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/openzfs.asc
+	inherit verify-sig
+
+	MY_PV=${PV/_rc/-rc}
+	SRC_URI="https://github.com/openzfs/zfs/releases/download/zfs-${MY_PV}/zfs-${MY_PV}.tar.gz"
+	SRC_URI+=" verify-sig? ( https://github.com/openzfs/zfs/releases/download/zfs-${MY_PV}/zfs-${MY_PV}.tar.gz.asc )"
+	S="${WORKDIR}/zfs-${MY_PV}"
+
+	ZFS_KERNEL_COMPAT="${MODULES_KERNEL_MAX}"
+	# Increments minor eg 5.14 -> 5.15, and still supports override.
+	ZFS_KERNEL_DEP="${ZFS_KERNEL_COMPAT_OVERRIDE:-${ZFS_KERNEL_COMPAT}}"
+	ZFS_KERNEL_DEP="${ZFS_KERNEL_DEP%%.*}.$(( ${ZFS_KERNEL_DEP##*.} + 1))"
+
+	if [[ ${PV} != *_rc* ]] ; then
+		KEYWORDS="~amd64 ~arm64 ~loong ~ppc64 ~riscv ~sparc"
+	fi
+fi
+
+LICENSE="CDDL MIT debug? ( GPL-2+ )"
+SLOT="0/${PVR}"
+IUSE="custom-cflags debug +rootfs"
+RESTRICT="test"
+
+BDEPEND="
+	app-alternatives/awk
+	dev-lang/perl
+"
+
+if [[ ${PV} != 9999 ]] ; then
+	BDEPEND+=" verify-sig? ( sec-keys/openpgp-keys-openzfs )"
+
+	IUSE+=" +dist-kernel-cap"
+	RDEPEND="
+		dist-kernel-cap? ( dist-kernel? (
+			<virtual/dist-kernel-${ZFS_KERNEL_DEP}
+		) )
+	"
+fi
+
+# Used to suggest matching USE, but without suggesting to disable
+PDEPEND="dist-kernel? ( ~sys-fs/zfs-${PV}[dist-kernel] )"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-2.1.11-gentoo.patch
+)
+
+pkg_pretend() {
+	use rootfs || return 0
+}
+
+pkg_setup() {
+	local CONFIG_CHECK="
+		EFI_PARTITION
+		ZLIB_DEFLATE
+		ZLIB_INFLATE
+		!DEBUG_LOCK_ALLOC
+		!PAX_KERNEXEC_PLUGIN_METHOD_OR
+	"
+	use debug && CONFIG_CHECK+="
+		DEBUG_INFO
+		FRAME_POINTER
+		!DEBUG_INFO_REDUCED
+	"
+	use rootfs && CONFIG_CHECK+="
+		BLK_DEV_INITRD
+		DEVTMPFS
+	"
+
+	kernel_is -lt 5 && CONFIG_CHECK+=" IOSCHED_NOOP"
+
+	if [[ ${PV} != 9999 ]] ; then
+		local kv_major_max kv_minor_max zcompat
+		zcompat="${ZFS_KERNEL_COMPAT_OVERRIDE:-${ZFS_KERNEL_COMPAT}}"
+		kv_major_max="${zcompat%%.*}"
+		zcompat="${zcompat#*.}"
+		kv_minor_max="${zcompat%%.*}"
+		kernel_is -le "${kv_major_max}" "${kv_minor_max}" || die \
+			"Linux ${kv_major_max}.${kv_minor_max} is the latest supported version"
+	fi
+
+	linux-mod-r1_pkg_setup
+}
+
+src_prepare() {
+	default
+
+	# Run unconditionally (bug #792627)
+	eautoreconf
+
+	if [[ ${PV} != 9999 ]] ; then
+		# Set module revision number
+		sed -Ei "s/(Release:.*)1/\1${PR}-gentoo/" META || die
+	fi
+}
+
+src_configure() {
+	use custom-cflags || strip-flags
+	filter-ldflags -Wl,*
+
+	local myconf=(
+		--bindir="${EPREFIX}"/bin
+		--sbindir="${EPREFIX}"/sbin
+		--with-config=kernel
+		--with-linux="${KV_DIR}"
+		--with-linux-obj="${KV_OUT_DIR}"
+		$(use_enable debug)
+
+		# See gentoo.patch
+		GENTOO_MAKEARGS_EVAL="${MODULES_MAKEARGS[*]@Q}"
+		TEST_JOBS="$(makeopts_jobs)"
+	)
+
+	econf "${myconf[@]}"
+}
+
+src_compile() {
+	emake "${MODULES_MAKEARGS[@]}"
+}
+
+src_install() {
+	emake "${MODULES_MAKEARGS[@]}" DESTDIR="${ED}" install
+	modules_post_process
+
+	dodoc AUTHORS COPYRIGHT META README.md
+}
+
+_old_layout_cleanup() {
+	# new files are just extra/{spl,zfs}.ko with no subdirs.
+	local olddir=(
+		avl/zavl
+		icp/icp
+		lua/zlua
+		nvpair/znvpair
+		spl/spl
+		unicode/zunicode
+		zcommon/zcommon
+		zfs/zfs
+		zstd/zzstd
+	)
+
+	# kernel/module/Kconfig contains possible compressed extentions.
+	local kext kextfiles
+		for kext in .ko{,.{gz,xz,zst}}; do
+		kextfiles+=( "${olddir[@]/%/${kext}}" )
+	done
+
+	local oldfile oldpath
+	for oldfile in "${kextfiles[@]}"; do
+		oldpath="${EROOT}/lib/modules/${KV_FULL}/extra/${oldfile}"
+		if [[ -f "${oldpath}" ]]; then
+			ewarn "Found obsolete zfs module ${oldfile} for current kernel ${KV_FULL}, removing."
+			rm -rv "${oldpath}" || die
+			# we do not remove non-empty directories just for safety in case there's something else.
+			# also it may fail if there are both compressed and uncompressed modules installed.
+			rmdir -v --ignore-fail-on-non-empty "${oldpath%/*.*}" || die
+		fi
+	done
+}
+
+pkg_postinst() {
+	# Check for old module layout before doing anything else.
+	# only attempt layout cleanup if new .ko location is used.
+	local newko=( "${EROOT}/lib/modules/${KV_FULL}/extra"/{zfs,spl}.ko* )
+	# We check first array member, if glob above did not exand, it will be "zfs.ko*" and -f will return false.
+	# if glob expanded -f will do correct file precense check.
+	[[ -f ${newko[0]} ]] && _old_layout_cleanup
+
+	linux-mod-r1_pkg_postinst
+
+	if use x86 || use arm ; then
+		ewarn "32-bit kernels will likely require increasing vmalloc to"
+		ewarn "at least 256M and decreasing zfs_arc_max to some value less than that."
+	fi
+
+	if has_version sys-boot/grub ; then
+		ewarn "This version of OpenZFS includes support for new feature flags"
+		ewarn "that are incompatible with previous versions. GRUB2 support for"
+		ewarn "/boot with the new feature flags is not yet available."
+		ewarn "Do *NOT* upgrade root pools to use the new feature flags."
+		ewarn "Any new pools will be created with the new feature flags by default"
+		ewarn "and will not be compatible with older versions of OpenZFS. To"
+		ewarn "create a new pool that is backward compatible wih GRUB2, use "
+		ewarn
+		ewarn "zpool create -o compatibility=grub2 ..."
+		ewarn
+		ewarn "Refer to /usr/share/zfs/compatibility.d/grub2 for list of features."
+	fi
+}