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Thu, 17 Sep 2026 08:18:38 -0700 (PDT) From: Adarsh Das To: gregkh@linuxfoundation.org Cc: dakr@kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, rafael@kernel.org, stable@vger.kernel.org, syzbot+4393dfdddf166f2de2b0@syzkaller.appspotmail.com Subject: Re: [PATCH] kobject: fix uevent socket use-after-free on net namespace delete Date: Thu, 17 Sep 2026 20:48:30 +0530 Message-ID: <20260917151830.89024-1-adarshdas950@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <2026091756-widen-doozy-399c@gregkh> References: <2026091756-widen-doozy-399c@gregkh> Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, Sorry, I wasn't aware of the Assisted-by tag before. Should I send a V2 with it? For testing I ran syzbot's C repro with -smp 4 on master, with multiple parallel instances of the repro. I was able to reproduce the bug: BUG: KASAN: slab-use-after-free in kobject_uevent_env+ Read of size 8 at addr ffff88800fa7f090 by task kworker/u16:5 CPU: 3 Workqueue: ib-unreg-wq ib_unregister_work Call Trace: kasan_report kobject_uevent_env+0xc71/0xd90 device_del+0x7c7/0xcf0 disable_device+0x1d2/0x260 __ib_unregister_device+0x26b/0x400 ib_unregister_work+0x19/0x30 worker_thread kthread Allocated by task 498: uevent_net_init+0xe5/0x340 setup_net copy_net_ns unshare_nsproxy_namespaces ksys_unshare Freed by task 63: kfree ops_undo_list cleanup_net worker_thread The buggy address belongs to the cache kmalloc-32 of size 32 With this patch applied, I ran the same repro repeatedly (including parallel runs) and did not see the KASAN error anymore.