{"id":"CVE-2026-80730","summary":"ring-buffer: Fix crash passing ERR_PTR to kthread_stop()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix crash passing ERR_PTR to kthread_stop()\n\nIn test_ringbuffer()'s out_free cleanup loop, the check\n`!rb_threads[cpu]` only catches NULL entries and misses entries that\nhold an ERR_PTR.\n\nrb_threads[] is static, so unassigned slots are NULL. But when\nkthread_run_on_cpu() fails for a cpu, it stores ERR_PTR(-ENOMEM) (or\n-EINTR) in rb_threads[cpu] before the creation loop jumps to out_free.\nThat entry is non-NULL, so the old `!ptr` check does not break, and the\ncleanup proceeds to call kthread_stop() on the ERR_PTR. kthread_stop()\nthen dereferences the bogus pointer, crashing the kernel during the\nlate_initcall self-test.\n\ncrash logs:\n  BUG: kernel NULL pointer dereference, address: 000000000000001c\n  Oops: 0002 [#1] SMP NOPTI\n  CPU: 1 PID: 1 Comm: swapper/0 Not tainted 7.2.0-rc6-dirty #7 PREEMPT(lazy)\n  RIP: 0010:kthread_stop+0x2e/0x220\n  RBX: fffffffffffffff4\n  CR2: 000000000000001c\n  Call Trace:\n   \u003cTASK\u003e\n   test_ringbuffer+0x1ec/0x650\n   do_one_initcall+0x6c/0x2c0\n   kernel_init_freeable+0x21d/0x420\n   kernel_init+0x15/0x1c0\n   ret_from_fork+0x21b/0x320\n   \u003c/TASK\u003e\n  Kernel panic - not syncing: Fatal exception","modified":"2026-09-05T03:48:34.772282303Z","published":"2026-09-03T08:21:48.325Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80730.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51d78fad30dd9ae45721224103662bdbcf210096"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8532983c312e8b875d7c9e440f8ee4674ea4b711"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91542863abade2fd4f2b361991f5386ad9d19c8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/93e7044b548a72022208595d2c1b188bb225ce83"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80730.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80730"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"64ed3a049e3e81b801e7c5bb052416152443f585"},{"fixed":"51d78fad30dd9ae45721224103662bdbcf210096"},{"fixed":"93e7044b548a72022208595d2c1b188bb225ce83"},{"fixed":"8532983c312e8b875d7c9e440f8ee4674ea4b711"},{"fixed":"6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902"},{"fixed":"3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b"},{"fixed":"91542863abade2fd4f2b361991f5386ad9d19c8c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80730.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80730.json"}}],"schema_version":"1.9.0"}