GHSA-P8F7-PQWJ-R94V
Vulnerability from github – Published: 2026-09-03 15:32 – Updated: 2026-09-03 15:32In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Fix crash passing ERR_PTR to kthread_stop()
In test_ringbuffer()'s out_free cleanup loop, the check
!rb_threads[cpu] 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 !ptr 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+0x2e/0x220 RBX: fffffffffffffff4 CR2: 000000000000001c Call Trace: test_ringbuffer+0x1ec/0x650 do_one_initcall+0x6c/0x2c0 kernel_init_freeable+0x21d/0x420 kernel_init+0x15/0x1c0 ret_from_fork+0x21b/0x320 Kernel panic - not syncing: Fatal exception
{
"affected": [],
"aliases": [
"CVE-2026-80730"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-03T13:06:11Z",
"severity": null
},
"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()\u0027s 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",
"id": "GHSA-p8f7-pqwj-r94v",
"modified": "2026-09-03T15:32:14Z",
"published": "2026-09-03T15:32:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80730"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": []
}
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