[Buildroot] [git commit branch/2025.08.x] {linux, linux-headers}: bump 6.12.x, 6.6.x, 6.1.x, 5.15.x series

[Arnout Vandecappelle]

commit: https://git.buildroot.net/buildroot/commit/?id=88bf12270a1ecdc0b6b64532ce3557cfcba0778a
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2025.08.x

Update the latest kernel releases to:
 - 6.12.53 -> 6.12.54
 - 6.6.112 -> 6.6.113
 - 6.1.156 -> 6.1.157
 - 5.15.194 -> 5.15.195

Signed-off-by: Titouan Christophe <titouan.christophe at mind.be>
---
 linux/linux.hash                     | 8 ++++----
 package/linux-headers/Config.in.host | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/linux/linux.hash b/linux/linux.hash
index 268ce36a33..a901813f1f 100644
--- a/linux/linux.hash
+++ b/linux/linux.hash
@@ -1,10 +1,10 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
 sha256  7ca4debc5ca912ebb8a76944a5c118afd5d09e31ef43c494adb14273da29a26e  linux-6.16.12.tar.xz
-sha256  663507accae673afcf4e210b4ae8d4352e61d926202e5da3f04bf71ca1d2c0b5  linux-6.12.53.tar.xz
-sha256  6c7d92bf316a56e91de41cb60da1f63d94a4f8aafaef6a13055df0c291138a22  linux-6.6.112.tar.xz
-sha256  d4bb148b204e5aed38690489736961cdaf925fe7b35cf1f56c47ad7a09a0228e  linux-6.1.156.tar.xz
+sha256  1b0dcd3390efeec44e528748609bafcf36eae895bb68c8f62ac5e5940943de62  linux-6.12.54.tar.xz
+sha256  1f95cfd2e461d192dd9c6130e47aefc9856529a74ace4191ad8e56ba1849c41e  linux-6.6.113.tar.xz
+sha256  a0a184e10221afcce4e87fcbec6af2ae9f63f64ad1985aa61e80c9596696f66e  linux-6.1.157.tar.xz
 # From https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
-sha256  348d6faada05fd4684450cd7c4e666c3c98cdb96f2309b1520c9a92a378c267e  linux-5.15.194.tar.xz
+sha256  23d080dc32f99d3939c3d1bd65a68ed85b8f934f92cc1841a63f898dcdb9a441  linux-5.15.195.tar.xz
 sha256  131e75eb14da6fd683b3882bcd856085cfca47cc1aa89cd2deb1b48d22d29d9f  linux-5.10.245.tar.xz
 sha256  9949210093ca924d7b41162bb4772becd3f28ff726a09d061558929690a1815a  linux-5.4.300.tar.xz
 # Locally computed
diff --git a/package/linux-headers/Config.in.host b/package/linux-headers/Config.in.host
index 4cd860d004..52260d9a0b 100644
--- a/package/linux-headers/Config.in.host
+++ b/package/linux-headers/Config.in.host
@@ -456,10 +456,10 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	string
 	default "5.4.300"	if BR2_KERNEL_HEADERS_5_4
 	default "5.10.245"	if BR2_KERNEL_HEADERS_5_10
-	default "5.15.194"	if BR2_KERNEL_HEADERS_5_15
-	default "6.1.156"	if BR2_KERNEL_HEADERS_6_1
-	default "6.6.112"	if BR2_KERNEL_HEADERS_6_6
-	default "6.12.53"	if BR2_KERNEL_HEADERS_6_12
+	default "5.15.195"	if BR2_KERNEL_HEADERS_5_15
+	default "6.1.157"	if BR2_KERNEL_HEADERS_6_1
+	default "6.6.113"	if BR2_KERNEL_HEADERS_6_6
+	default "6.12.54"	if BR2_KERNEL_HEADERS_6_12
 	default "6.16.12"	if BR2_KERNEL_HEADERS_6_16
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL