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    <lastBuildDate>Tue, 06 Oct 2026 23:00:20 +0000</lastBuildDate>
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      <title>CVE-2026-64163 — test_kprobes: clear kprobes between test runs</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-64163</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;test_kprobes: clear kprobes between test runs&lt;/p&gt;
&lt;p&gt;Running the kprobes sanity tests twice makes all tests fail and
eventually crashes the kernel.&lt;/p&gt;
&lt;p&gt;[root@martin-riscv-1 ~]# echo 1 &amp;gt; /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 &amp;gt; /sys/kernel/debug/kunit/kprobes_test/run
...
  # test_kprobe: EXPECTATION FAILED at lib/tests/test_kprobes.c:64
  Expected 0 == register_kprobe(&amp;amp;kp), but
      register_kprobe(&amp;amp;kp) == -22 (0xffffffffffffffea)
...
  Unable to handle kernel paging request ...&lt;/p&gt;
&lt;p&gt;The testsuite defines several kprobes and kretprobes as static variables
that are preserved across test runs.&lt;/p&gt;
&lt;p&gt;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 cleared.&lt;/p&gt;
&lt;p&gt;The existing code clears some of the probes between subsequent tests, but
not between two test runs. The leftover data from a previous test run
makes the registrations fail in the next run.&lt;/p&gt;
&lt;p&gt;Move the cleanups for all kprobes into kprobes_test_init, this function
is called before each single test (including the first test of a test
run).&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;test_kprobes: clear kprobes between test runs&lt;/p&gt;
&lt;p&gt;Running the kprobes sanity tests twice makes all tests fail and
eventually crashes the kernel.&lt;/p&gt;
&lt;p&gt;[root@martin-riscv-1 ~]# echo 1 &amp;gt; /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 &amp;gt; /sys/kernel/debug/kunit/kprobes_test/run
...
  # test_kprobe: EXPECTATION FAILED at lib/tests/test_kprobes.c:64
  Expected 0 == register_kprobe(&amp;amp;kp), but
      register_kprobe(&amp;amp;kp) == -22 (0xffffffffffffffea)
...
  Unable to handle kernel paging request ...&lt;/p&gt;
&lt;p&gt;The testsuite defines several kprobes and kretprobes as static variables
that are preserved across test runs.&lt;/p&gt;
&lt;p&gt;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 cleared.&lt;/p&gt;
&lt;p&gt;The existing code clears some of the probes between subsequent tests, but
not between two test runs. The leftover data from a previous test run
makes the registrations fail in the next run.&lt;/p&gt;
&lt;p&gt;Move the cleanups for all kprobes into kprobes_test_init, this function
is called before each single test (including the first test of a test
run).&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-64163</guid>
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