{ "cveId": "CVE-2026-81001", "url": "https://patchblox.com/security/cve/CVE-2026-81001", "summary": "CVE-2026-81001 is fixed in 52 products on 1 platform, first by DEBIAN-CVE-2026-81001, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: slip: fix use-after-free in sl_sync() slip_devs...", "description": "In the Linux kernel, the following vulnerability has been resolved: slip: fix use-after-free in sl_sync() slip_devs[] stores bare net_device pointers and takes no reference on them. sl_sync() and sl_alloc() walk that table from slip_open() under rtnl_lock(), while an entry is dropped by sl_free_netdev(), which sl_setup() installs as dev-\u003Epriv_destructor. priv_destructor is called from netdev_run_todo(), which deliberately runs with the RTNL semaphore released so that it can sleep while waiting for the device refcount to drop: \t/* Snapshot list, allow later requests */ \tlist_replace_init(\u0026net_todo_list, \u0026list); \t__rtnl_unlock(); \t... \t\tif (dev-\u003Epriv_destructor) \t\t\tdev-\u003Epriv_destructor(dev);\t/* slip_devs[i] = NULL */ \t\tif (dev-\u003Eneeds_free_netdev) \t\t\tfree_netdev(dev); \t\t... \t\t/* Free network device */ \t\tkobject_put(\u0026dev-\u003Edev.kobj); So rtnl_lock() does not serialise slip_open() against the teardown at all. sl_sync() can load slip_devs[i] while the entry is still published and dereference it after netdev_run_todo() has run the destructor and released the device: CPU0 (slip_open) CPU1 (slip_close) unregister_netdev() rtnl_unlock() netdev_run_todo() __rtnl_unlock() rtnl_lock() sl_sync() dev = slip_devs[i] priv_destructor(dev) slip_devs[i] = NULL kobject_put(\u0026dev-\u003Edev.kobj) /* dev is freed */ sl = netdev_priv(dev) if (sl-\u003Etty || sl-\u003Eleased) /* use-after-free */ BUG: KASAN: use-after-free in sl_sync drivers/net/slip/slip.c:730 [inline] BUG: KASAN: use-after-free in slip_open\u002B0xef4/0x1210 drivers/net/slip/slip.c:806 Read of size 1 at addr ffff8880712dac71 by task syz-executor.2/6506 CPU: 2 PID: 6506 Comm: syz-executor.2 Not tainted 6.1.134-syzkaller-00260-g0c8fc3469765 #0 Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: sl_sync drivers/net/slip/slip.c:730 [inline] slip_open\u002B0xef4/0x1210 drivers/net/slip/slip.c:806 tty_ldisc_open\u002B0xa2/0x120 drivers/tty/tty_ldisc.c:433 tty_set_ldisc\u002B0x324/0x720 drivers/tty/tty_ldisc.c:564 tiocsetd drivers/tty/tty_io.c:2428 [inline] tty_ioctl\u002B0x5f0/0x1530 drivers/tty/tty_io.c:2712 Allocated by task 6502: alloc_netdev_mqs\u002B0x98/0xfe0 net/core/dev.c:10719 sl_alloc drivers/net/slip/slip.c:756 [inline] slip_open\u002B0x36d/0x1210 drivers/net/slip/slip.c:817 tty_ldisc_open\u002B0xa2/0x120 drivers/tty/tty_ldisc.c:433 tty_set_ldisc\u002B0x324/0x720 drivers/tty/tty_ldisc.c:564 Freed by task 6497: device_release\u002B0xa2/0x240 drivers/base/core.c:2507 kobject_put\u002B0x179/0x280 lib/kobject.c:729 netdev_run_todo\u002B0x6c8/0xef0 net/core/dev.c:10509 slip_close\u002B0x166/0x1c0 drivers/net/slip/slip.c:906 tty_ldisc_close\u002B0x113/0x1a0 drivers/tty/tty_ldisc.c:456 tty_ldisc_kill\u002B0x94/0x160 drivers/tty/tty_ldisc.c:614 tty_ldisc_release\u002B0xe3/0x2b0 drivers/tty/tty_ldisc.c:782 tty_release\u002B0xbcc/0xe70 drivers/tty/tty_io.c:1860 Commit e58c19124189 (\u0022slip: Fix use-after-free Read in slip_open\u0022) fixed a different source of stale entries - a device left in slip_devs[] after slip_open() freed it on the registration error path - and does not address this race, which is why the report survives it. Drop the entry from ndo_uninit instead. unregister_netdevice() calls ndo_uninit under RTNL, before the device is queued to netdev_run_todo(), so an entry that sl_sync() can still see while holding RTNL belongs to a device that cannot be freed until RTNL is dropped. sl_free_netdev() stays only for the slip_open() error path, where register_netdevice() may have failed before ndo_init and ndo_uninit is then not called either. Both running for the same device is harmless: the ---truncated---", "published": "2026-09-11T20:19:08Z", "severity": "high", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00164, "epssPercentile": 0.05628, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.39.1", "fix": "OPENSUSE-SU-2026:22091-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1", "released": "2026-11-07T00:47:19Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.39.1", "fix": "OPENSUSE-SU-2026:22091-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1", "released": "2026-11-07T00:47:19Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": 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