diff --git a/.vscode/cspell.dictionaries/jargon.wordlist.txt b/.vscode/cspell.dictionaries/jargon.wordlist.txt
index c468ef0ea74..8b6a8c90858 100644
--- a/.vscode/cspell.dictionaries/jargon.wordlist.txt
+++ b/.vscode/cspell.dictionaries/jargon.wordlist.txt
@@ -254,3 +254,29 @@ Hijri
 Nowruz
 charmap
 hijri
+
+csignal
+noent
+nptl
+oldset
+ptrs
+rdband
+rustix
+setmask
+sigaddset
+sigemptyset
+sigfillset
+sighandler
+sigmask
+signum
+sigprocmask
+sigrtmin
+sigset
+sigsys
+esrch
+SRCH
+Nofile
+rprocess
+statat
+getdents
+SIGTHR
diff --git a/Cargo.lock b/Cargo.lock
index 3b6c0bfaf62..75d96b8de6b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3787,7 +3787,8 @@ version = "0.8.0"
 dependencies = [
  "clap",
  "fluent",
- "nix",
+ "libc",
+ "rustix",
  "uucore",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 75b6b07c855..dc3d5c73448 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -450,9 +450,11 @@ rstest = "0.26.0"
 rstest_reuse = "0.7.0"
 rustc-hash = "2.1.1"
 rust-ini = "0.21.0"
-# binary name of coreutils can be hijacked by overriding getauxval via LD_PRELOAD
-# So we use param and avoid libc backend
-rustix = { version = "1.1.4", features = ["param"] }
+# use-libc: route syscalls through glibc instead of direct inline assembly,
+# ensuring compatibility with LD_PRELOAD, sanitizers, and glibc optimizations (e.g. getpid cache)
+rustix = { version = "1.1.4", default-features = false, features = [
+  "use-libc",
+] }
 same-file = "1.0.6"
 self_cell = "1.0.4"
 selinux = "0.6"
diff --git a/src/uu/env/src/env.rs b/src/uu/env/src/env.rs
index 3343544253e..aa1bcfc7017 100644
--- a/src/uu/env/src/env.rs
+++ b/src/uu/env/src/env.rs
@@ -1080,7 +1080,16 @@ where
         let Ok(sig) = signal_from_value(sig_value) else {
             return Ok(());
         };
-        signal_fn(sig)?;
+        match signal_fn(sig) {
+            Ok(()) => {}
+            Err(_) if !explicit => {
+                // When applying to all signals, silently skip signals that
+                // the OS refuses to change (e.g. SIGTHR on OpenBSD).
+                // GNU env also ignores these.
+                return Ok(());
+            }
+            Err(e) => return Err(e),
+        }
         log.record(sig_value, action_kind, explicit);
 
         // Set environment variable to communicate to Rust child processes