CVE-2026-64163

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

test_kprobes: clear kprobes between test runs

Running the kprobes sanity tests twice makes all tests fail and

eventually crashes the kernel.

[root@martin-riscv-1 ~]# echo 1 > /sys/kernel/debug/kunit/kprobes_test/run

...

# Totals: pass:5 fail:0 skip:0 total:5

ok 1 kprobes_test

[root@martin-riscv-1 ~]# echo 1 > /sys/kernel/debug/kunit/kprobes_test/run

...

# test_kprobe: EXPECTATION FAILED at lib/tests/test_kprobes.c:64

Expected 0 == register_kprobe(&kp), but

register_kprobe(&kp) == -22 (0xffffffffffffffea)

...

Unable to handle kernel paging request ...

The testsuite defines several kprobes and kretprobes as static variables

that are preserved across test runs.

After register_kprobe and unregister_kprobe, a kprobe contains some

leftover data that must be cleared before the kprobe can be registered

again. The tests are setting symbol_name to define the probe location.

Address and flags must be cleare

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References