{"id":"DEBIAN-CVE-2026-68090","details":"In the Linux kernel, the following vulnerability has been resolved:  debugobjects: Plug race against a concurrent OOM disable  syzbot reported a puzzling splat:     WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20  stub_timer() is installed as timer callback function in hrtimer_fixup_assert_init(), which is invoked when debug_object_assert_init() can't find a shadow object. In that case debug objects emits a warning about it before invoking the fixup.  Though the provided console log lacks this warning and instead has the following a few seconds before the splat:       ODEBUG: Out of memory. ODEBUG disabled  So the object was looked up in debug_object_assert_init() and the lookup failed due a concurrent out of memory situation which disabled debug objects and freed the shadow objects:  debug_object_assert_init()         if (!debug_objects_enabled)         \treturn;                         obj = alloc();                 \t\t\t\tif (!obj) { \t\t\t\t\t\t\t// Out of memory                                                 \tdebug_objects_enabled = false;                                                         free_objects();         obj = lookup_or_alloc();          // The lookup failed because the other side         // removed the objects, so this returns         // an error code as the object in question         // is not statically initialized  \tif (!IS_ERR_OR_NULL(obj))         \treturn;         if (!obj) {         \tdebug_oom();                 return;         }          print(...)            if (!debug_objects_enabled)                 return;          fixup(...)  The debug object splat is skipped because debug_objects_enabled is false, but the fixup callback is invoked unconditionally, which makes the timer disfunctional.  This is only a problem in debug_object_assert_init() and debug_object_activate() as both have to handle statically initialized objects and therefore must handle the error pointer return case gracefully. All other places only handle the found/not found case and the NULL pointer return is a signal for OOM. Otherwise they get a valid shadow object.  Plug the hole by checking whether debug objects are still enabled before invoking the print and fixup function in those two places.","modified":"2026-09-01T16:06:57.481126372Z","published":"2026-08-10T12:17:21.717Z","upstream":["CVE-2026-68090"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-68090"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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