s390/debug: Fix NULL pointer dereference in debug_set_level()

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In the Linux kernel, the following vulnerability has been resolved: s390/debug: Fix NULL pointer dereference in debug_set_level() Commit a2cec6863709 ("s390/debug: Add s390dbf kernel parameter") incorrectly removed a null-id check from debug_set_level(), introducing a possible NULL pointer dereference for debug-API users that put debug_register() results unchecked into debug_set_level(). Fix this by moving the check from the internal _debug_set_level() variant back to the external debug_set_level() wrapper.

Source published

25 Sep 2026 10:23:17 UTC

Source modified

19 Oct 2026 09:11:47 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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