CVE-2025-38323

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: atm: add lec_mutex<br /> <br /> syzbot found its way in net/atm/lec.c, and found an error path<br /> in lecd_attach() could leave a dangling pointer in dev_lec[].<br /> <br /> Add a mutex to protect dev_lecp[] uses from lecd_attach(),<br /> lec_vcc_attach() and lec_mcast_attach().<br /> <br /> Following patch will use this mutex for /proc/net/atm/lec.<br /> <br /> BUG: KASAN: slab-use-after-free in lecd_attach net/atm/lec.c:751 [inline]<br /> BUG: KASAN: slab-use-after-free in lane_ioctl+0x2224/0x23e0 net/atm/lec.c:1008<br /> Read of size 8 at addr ffff88807c7b8e68 by task syz.1.17/6142<br /> <br /> CPU: 1 UID: 0 PID: 6142 Comm: syz.1.17 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full)<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:94 [inline]<br /> dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120<br /> print_address_description mm/kasan/report.c:408 [inline]<br /> print_report+0xcd/0x680 mm/kasan/report.c:521<br /> kasan_report+0xe0/0x110 mm/kasan/report.c:634<br /> lecd_attach net/atm/lec.c:751 [inline]<br /> lane_ioctl+0x2224/0x23e0 net/atm/lec.c:1008<br /> do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159<br /> sock_do_ioctl+0x118/0x280 net/socket.c:1190<br /> sock_ioctl+0x227/0x6b0 net/socket.c:1311<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl fs/ioctl.c:893 [inline]<br /> __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> <br /> Allocated by task 6132:<br /> kasan_save_stack+0x33/0x60 mm/kasan/common.c:47<br /> kasan_save_track+0x14/0x30 mm/kasan/common.c:68<br /> poison_kmalloc_redzone mm/kasan/common.c:377 [inline]<br /> __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394<br /> kasan_kmalloc include/linux/kasan.h:260 [inline]<br /> __do_kmalloc_node mm/slub.c:4328 [inline]<br /> __kvmalloc_node_noprof+0x27b/0x620 mm/slub.c:5015<br /> alloc_netdev_mqs+0xd2/0x1570 net/core/dev.c:11711<br /> lecd_attach net/atm/lec.c:737 [inline]<br /> lane_ioctl+0x17db/0x23e0 net/atm/lec.c:1008<br /> do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159<br /> sock_do_ioctl+0x118/0x280 net/socket.c:1190<br /> sock_ioctl+0x227/0x6b0 net/socket.c:1311<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl fs/ioctl.c:893 [inline]<br /> __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Freed by task 6132:<br /> kasan_save_stack+0x33/0x60 mm/kasan/common.c:47<br /> kasan_save_track+0x14/0x30 mm/kasan/common.c:68<br /> kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576<br /> poison_slab_object mm/kasan/common.c:247 [inline]<br /> __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264<br /> kasan_slab_free include/linux/kasan.h:233 [inline]<br /> slab_free_hook mm/slub.c:2381 [inline]<br /> slab_free mm/slub.c:4643 [inline]<br /> kfree+0x2b4/0x4d0 mm/slub.c:4842<br /> free_netdev+0x6c5/0x910 net/core/dev.c:11892<br /> lecd_attach net/atm/lec.c:744 [inline]<br /> lane_ioctl+0x1ce8/0x23e0 net/atm/lec.c:1008<br /> do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159<br /> sock_do_ioctl+0x118/0x280 net/socket.c:1190<br /> sock_ioctl+0x227/0x6b0 net/socket.c:1311<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl fs/ioctl.c:893 [inline]<br /> __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893