The branch stable/12 has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=83f3bc609090aedb9b276e4f2b43e570857fd153

commit 83f3bc609090aedb9b276e4f2b43e570857fd153
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-04-09 23:25:06 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-05-01 00:38:29 +0000

    amd64: clear debug registers on execing 32bit Linux binary
    
    (cherry picked from commit 94172affa43af15fe3b50293a96c292eca30c386)
---
 sys/amd64/linux32/linux32_sysvec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/amd64/linux32/linux32_sysvec.c 
b/sys/amd64/linux32/linux32_sysvec.c
index 315dcc7ca629..1686891861c3 100644
--- a/sys/amd64/linux32/linux32_sysvec.c
+++ b/sys/amd64/linux32/linux32_sysvec.c
@@ -710,6 +710,8 @@ linux_exec_setregs(struct thread *td, struct image_params 
*imgp, u_long stack)
        regs->tf_cs = _ucode32sel;
        regs->tf_rbx = imgp->ps_strings;
 
+       x86_clear_dbregs(pcb);
+
        fpstate_drop(td);
 
        /* Do full restore on return so that we can change to a different %cs */
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