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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUG] mac802154: KASAN slab-use-after-free in mac802154_rx_mac_cmd_worker Date: Wed, 22 Jul 2026 23:37:58 -0400 Message-ID: <20260723033829.764639-1-shuangpeng.kernel@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Kernel Maintainers, I hit the following report while testing current upstream kernel: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker on commit: fce2dfa773ced15f27dd27cd0b482a7473cdcf2a (Jul 16 2026) To help trigger the bug more reliably, we applied a minimal diagnostic patch that only adds delays and print statements. The reproducer and .config files are here. https://gist.github.com/shuangpengbai/ea5e98e729d2ae8cb1e9481b5c315ab8 I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai [ 376.015401][ T12] BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker (net/mac802154/rx.c:110) [ 376.016760][ T12] Read of size 4 at addr ffff888115e78b58 by task kworker/u8:0/12 [ 376.017796][ T12] [ 376.018231][ T12] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 376.018237][ T12] Workqueue: phy1-mac-cmds mac802154_rx_mac_cmd_worker [ 376.018270][ T12] Call Trace: [ 376.018292][ T12] [ 376.018302][ T12] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 376.018393][ T12] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) [ 376.018529][ T12] kasan_report (mm/kasan/report.c:595) [ 376.018543][ T12] mac802154_rx_mac_cmd_worker (net/mac802154/rx.c:110) [ 376.018560][ T12] process_scheduled_works (kernel/workqueue.c:3322 kernel/workqueue.c:3405) [ 376.018589][ T12] worker_thread (kernel/workqueue.c:3486) [ 376.018599][ T12] kthread (kernel/kthread.c:436) [ 376.018647][ T12] ret_from_fork (archkernel/process.c:158) [ 376.018735][ T12] ret_from_fork_asm (arch/x86/entry/entry_64.S:245) [ 376.018754][ T12] [ 376.018758][ T12] [ 376.032833][ T12] Freed by task 8455 on cpu 0 at 375.611793s: [ 376.033290][ T12] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 376.033651][ T12] kasan_save_free_info (mm/kasan/generic.c:584) [ 376.034018][ T12] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) [ 376.034371][ T12] kfree (./include/linux/kasan.h:235 mm/slub.c:2705 mm/slub.c:6405 mm/slub.c:6720) [ 376.034677][ T12] device_release (drivers/gpu/drm/vkms/vkms_configfs.c:690) [ 376.035065][ T12] kobject_put (lib/kobject.c:689 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737) [ 376.035413][ T12] netdev_run_todo (net/core/dev.c:11749) [ 376.035808][ T12] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1117) [ 376.036235][ T12] genl_rcv_msg (net/netlink/genetlink.c:1194 net/netlink/genetlink.c:1209) [ 376.036574][ T12] netlink_rcv_skb (net/netlink/af_netlink.c:2556) [ 376.036933][ T12] genl_rcv (net/netlink/genetlink.c:1218) [ 376.037233][ T12] netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345) [ 376.037584][ T12] netlink_sendmsg (net/netlink/af_netlink.c:1900) [ 376.037930][ T12] __sock_sendmsg (net/socket.c:775 net/socket.c:790) [ 376.038335][ T12] __sys_sendto (net/socket.c:2252) [ 376.038676][ T12] __x64_sys_sendto (net/socket.c:2259 net/socket.c:2255 net/socket.c:2255) [ 376.039018][ T12] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 376.039455][ T12] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 376.039998][ T12] [ 376.040171][ T12] The buggy address belongs to the object at ffff888115e78000 [ 376.040171][ T12] which belongs to the cache kmalloc-cg-8k of size 8192 [ 376.041250][ T12] The buggy address is located 2904 bytes inside of [ 376.041250][ T12] freed 8192-byte region [ffff888115e78000, ffff888115e7a000) [ 376.042239][ T12] [ 376.042414][ T12] The buggy address belongs to the physical page: Best, Shuangpeng