{ "cveId": "CVE-2026-80730", "url": "https://patchblox.com/security/cve/CVE-2026-80730", "summary": "CVE-2026-80730 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-80730, released September 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "ring-buffer: Fix crash passing ERR_PTR to kthread_stop()", "description": "In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix crash passing ERR_PTR to kthread_stop() In test_ringbuffer()\u0027s out_free cleanup loop, the check \u0060!rb_threads[cpu]\u0060 only catches NULL entries and misses entries that hold an ERR_PTR. rb_threads[] is static, so unassigned slots are NULL. But when kthread_run_on_cpu() fails for a cpu, it stores ERR_PTR(-ENOMEM) (or -EINTR) in rb_threads[cpu] before the creation loop jumps to out_free. That entry is non-NULL, so the old \u0060!ptr\u0060 check does not break, and the cleanup proceeds to call kthread_stop() on the ERR_PTR. kthread_stop() then dereferences the bogus pointer, crashing the kernel during the late_initcall self-test. crash logs: BUG: kernel NULL pointer dereference, address: 000000000000001c Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 1 Comm: swapper/0 Not tainted 7.2.0-rc6-dirty #7 PREEMPT(lazy) RIP: 0010:kthread_stop\u002B0x2e/0x220 RBX: fffffffffffffff4 CR2: 000000000000001c Call Trace: \u003CTASK\u003E test_ringbuffer\u002B0x1ec/0x650 do_one_initcall\u002B0x6c/0x2c0 kernel_init_freeable\u002B0x21d/0x420 kernel_init\u002B0x15/0x1c0 ret_from_fork\u002B0x21b/0x320 \u003C/TASK\u003E Kernel panic - not syncing: Fatal exception", "published": "2026-09-03T13:06:11Z", "severity": "Moderate", "cvss": 5.5, "epss": 0.00173, "epssPercentile": 0.06696, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, 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