diff --git a/SOURCES/grubby-bls b/SOURCES/grubby-bls
index f5b9735..07df5c8 100755
--- a/SOURCES/grubby-bls
+++ b/SOURCES/grubby-bls
@@ -500,7 +500,7 @@ update_bls_fragment() {
             if [[ -n $old_args ]]; then
                 opts="$(update_args "${old_args}" "${remove_args}" "${add_args}")"
                 opts="$(echo "$opts" | sed -e 's/\//\\\//g')"
-                sed -i -e "s/^GRUB_CMDLINE_LINUX.*/GRUB_CMDLINE_LINUX=\\\"${opts}\\\"/" "${grub_etc_default}"
+                sed -i -e "s/^GRUB_CMDLINE_LINUX=.*/GRUB_CMDLINE_LINUX=\\\"${opts}\\\"/" "${grub_etc_default}"
             fi
         fi
 
diff --git a/SPECS/grubby.spec b/SPECS/grubby.spec
index 1e9ae63..878b99d 100644
--- a/SPECS/grubby.spec
+++ b/SPECS/grubby.spec
@@ -1,6 +1,6 @@
 Name: grubby
 Version: 8.40
-Release: 48%{?dist}
+Release: 49%{?dist}
 Summary: Command line tool for updating BootLoaderSpec files
 License: GPLv2+
 URL: https://github.com/rhinstaller/grubby
@@ -169,6 +169,10 @@ current boot environment.
 %{_mandir}/man8/*.8*
 
 %changelog
+* Wed Jan 10 2024 Marta Lewandowska <mlewando@redhat.com> - 8.40-49
+- Do not overwrite all vars that start with GRUB_CMDLINE_LINUX
+- Resolves: #RHEL-12853
+
 * Tue Feb 21 2023 Marta Lewandowska <mlewando@redhat.com> - 8.40-48
 - Apply Marta's default args fix
 - Resolves: #1900829