[Buildroot] [git commit branch/2026.02.x] {linux, linux-headers}: bump 6.12.x, 6.6.x, 6.1.x, 5.15.x, 5.10.x, 6.18.x series

[Titouan Christophe]

commit: https://gitlab.com/buildroot.org/buildroot/-/commit/d1d3cf26d24590e73c214d319e95e4cceac0dad5
branch: https://gitlab.com/buildroot.org/buildroot/-/tree/2026.02.x

Update the latest kernel releases to:
 - 6.12.84 -> 6.12.90
 - 6.6.136 -> 6.6.140
 - 6.1.169 -> 6.1.173
 - 5.15.203 -> 5.15.207
 - 5.10.253 -> 5.10.256
 - 6.18.25 -> 6.18.32

Signed-off-by: Titouan Christophe <titouan.christophe at mind.be>
---
 linux/before-6.17/linux.hash         | 10 +++++-----
 linux/from-6.17/linux.hash           |  2 +-
 package/linux-headers/Config.in.host | 12 ++++++------
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/linux/before-6.17/linux.hash b/linux/before-6.17/linux.hash
index d9f1290f9c..19dc977938 100644
--- a/linux/before-6.17/linux.hash
+++ b/linux/before-6.17/linux.hash
@@ -1,10 +1,10 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
-sha256  d56e463a7b1f5355794ae83a102453ad930a51f9cb46b295fcf24a717bff52dd  linux-6.12.84.tar.xz
-sha256  6fb2d21a98281d786ee5fc63760e6f2c33e567e178e83c605bf0359eabbcf471  linux-6.6.136.tar.xz
-sha256  e0cbe674801749075b93008d8854dbf1c8d300805ada0b60f6f907bbb83aef2c  linux-6.1.169.tar.xz
+sha256  1f1a1ff057468b8a6284d3ce1d181278259beb5670ea16724c46dbf8820fa2a8  linux-6.12.90.tar.xz
+sha256  d67c9674a2d4307f3747183935a5d434391df0fc5f5bf0e00691e059f664b7db  linux-6.6.140.tar.xz
+sha256  c4f32c6cfbe8c31478f18a4b2a50f89e73f8641ba1d683d80efc16c898876d98  linux-6.1.173.tar.xz
 # From https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
-sha256  0bebe7d82a57e98792a407109566f1813fde97aaf7f735c1c7e6feebe833dc64  linux-5.15.203.tar.xz
-sha256  ec0724928050e8e2f6226fe8bbb206f42a951c0ed2dbb533c5462789f6d75ac8  linux-5.10.253.tar.xz
+sha256  50eb7fa307745f30e5cae4c17e188fc42ce6a72f7d925d5ea7e3c2135de6148e  linux-5.15.207.tar.xz
+sha256  f1e9dac8ec41e5bd7b1811158c7b72269696ce1c37fbdd17a898b293b54d8e5f  linux-5.10.256.tar.xz
 # Locally computed
 sha256  93408e0c5d70ff0ab63dcf9edec6fda2b8524281d611a88e56590436bda43914  linux-cip-5.10.246-cip66.tar.gz
 sha256  b3454708b98016f02604433e41060be2c1feb595c2bddeb25292596f047f0915  linux-cip-5.10.246-cip66-rt29.tar.gz
diff --git a/linux/from-6.17/linux.hash b/linux/from-6.17/linux.hash
index a8c9a7ce78..e401c64996 100644
--- a/linux/from-6.17/linux.hash
+++ b/linux/from-6.17/linux.hash
@@ -1,6 +1,6 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
 sha256  cde8bf6739be4a0777fedbbba5330b8188c55680c45a922a4dfa289cbec6f185  linux-6.19.14.tar.xz
-sha256  29680a07d4430b269af6ce68079b0e81dbd60f03e6f351e0661991fe39bd1898  linux-6.18.25.tar.xz
+sha256  067dadd445578284ea6158f312f7970d8940fed3e094dbe49cff66d188d3bda4  linux-6.18.32.tar.xz
 
 # Licenses hashes
 sha256  fb5a425bd3b3cd6071a3a9aff9909a859e7c1158d54d32e07658398cd67eb6a0  COPYING
diff --git a/package/linux-headers/Config.in.host b/package/linux-headers/Config.in.host
index 3b517283a7..12b44624c1 100644
--- a/package/linux-headers/Config.in.host
+++ b/package/linux-headers/Config.in.host
@@ -464,12 +464,12 @@ endchoice
 
 config BR2_DEFAULT_KERNEL_HEADERS
 	string
-	default "5.10.253"	if BR2_KERNEL_HEADERS_5_10
-	default "5.15.203"	if BR2_KERNEL_HEADERS_5_15
-	default "6.1.169"	if BR2_KERNEL_HEADERS_6_1
-	default "6.6.136"	if BR2_KERNEL_HEADERS_6_6
-	default "6.12.84"	if BR2_KERNEL_HEADERS_6_12
-	default "6.18.25"	if BR2_KERNEL_HEADERS_6_18
+	default "5.10.256"	if BR2_KERNEL_HEADERS_5_10
+	default "5.15.207"	if BR2_KERNEL_HEADERS_5_15
+	default "6.1.173"	if BR2_KERNEL_HEADERS_6_1
+	default "6.6.140"	if BR2_KERNEL_HEADERS_6_6
+	default "6.12.90"	if BR2_KERNEL_HEADERS_6_12
+	default "6.18.32"	if BR2_KERNEL_HEADERS_6_18
 	default "6.19.14"	if BR2_KERNEL_HEADERS_6_19
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL