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diff --git a/sys/arm64/arm64/identcpu.c b/sys/arm64/arm64/identcpu.c
--- a/sys/arm64/arm64/identcpu.c
+++ b/sys/arm64/arm64/identcpu.c
@@ -1283,7 +1283,14 @@
MRS_FIELD(ID_AA64MMFR1, ETS, false, MRS_LOWER, 0, id_aa64mmfr1_ets),
MRS_FIELD(ID_AA64MMFR1, TWED, false, MRS_LOWER, 0, id_aa64mmfr1_twed),
MRS_FIELD(ID_AA64MMFR1, XNX, false, MRS_LOWER, 0, id_aa64mmfr1_xnx),
- MRS_FIELD(ID_AA64MMFR1, SpecSEI, false, MRS_LOWER, 0,
+ /*
+ * SpecSEI != 0 indicates the CPU might generate an external abort
+ * under speculation, while 0 indicates it can't happen. It's safer
+ * to incorrectly indicate it might happen when it can't rather than
+ * say it can't happen when it could. As such use the largest value
+ * found in the system.
+ */
+ MRS_FIELD(ID_AA64MMFR1, SpecSEI, false, MRS_HIGHER, 0,
id_aa64mmfr1_specsei),
MRS_FIELD(ID_AA64MMFR1, PAN, false, MRS_LOWER, 0, id_aa64mmfr1_pan),
MRS_FIELD(ID_AA64MMFR1, LO, false, MRS_LOWER, 0, id_aa64mmfr1_lo),

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