{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"CRITICAL" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nslip: fix use-after-free in sl_sync()\n\nslip_devs[] stores bare net_device pointers and takes no reference on\nthem. sl_sync() and sl_alloc() walk that table from slip_open() under\nrtnl_lock(), while an entry is dropped by sl_free_netdev(), which\nsl_setup() installs as dev->priv_destructor.\n\npriv_destructor is called from netdev_run_todo(), which deliberately\nruns with the RTNL semaphore released so that it can sleep while waiting\nfor the device refcount to drop:\n\n\t/* Snapshot list, allow later requests */\n\tlist_replace_init(&net_todo_list, &list);\n\n\t__rtnl_unlock();\n\t...\n\t\tif (dev->priv_destructor)\n\t\t\tdev->priv_destructor(dev);\t/* slip_devs[i] = NULL */\n\t\tif (dev->needs_free_netdev)\n\t\t\tfree_netdev(dev);\n\t\t...\n\t\t/* Free network device */\n\t\tkobject_put(&dev->dev.kobj);\n\nSo rtnl_lock() does not serialise slip_open() against the teardown at\nall. sl_sync() can load slip_devs[i] while the entry is still published\nand dereference it after netdev_run_todo() has run the destructor and\nreleased the device:\n\n CPU0 (slip_open) CPU1 (slip_close)\n unregister_netdev()\n rtnl_unlock()\n netdev_run_todo()\n __rtnl_unlock()\n rtnl_lock()\n sl_sync()\n dev = slip_devs[i]\n priv_destructor(dev)\n slip_devs[i] = NULL\n kobject_put(&dev->dev.kobj)\n /* dev is freed */\n sl = netdev_priv(dev)\n if (sl->tty || sl->leased) /* use-after-free */\n\n BUG: KASAN: use-after-free in sl_sync drivers/net/slip/slip.c:730 [inline]\n BUG: KASAN: use-after-free in slip_open+0xef4/0x1210 drivers/net/slip/slip.c:806\n Read of size 1 at addr ffff8880712dac71 by task syz-executor.2/6506\n\n CPU: 2 PID: 6506 Comm: syz-executor.2 Not tainted 6.1.134-syzkaller-00260-g0c8fc3469765 #0\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014\n Call Trace:\n sl_sync drivers/net/slip/slip.c:730 [inline]\n slip_open+0xef4/0x1210 drivers/net/slip/slip.c:806\n tty_ldisc_open+0xa2/0x120 drivers/tty/tty_ldisc.c:433\n tty_set_ldisc+0x324/0x720 drivers/tty/tty_ldisc.c:564\n tiocsetd drivers/tty/tty_io.c:2428 [inline]\n tty_ioctl+0x5f0/0x1530 drivers/tty/tty_io.c:2712\n\n Allocated by task 6502:\n alloc_netdev_mqs+0x98/0xfe0 net/core/dev.c:10719\n sl_alloc drivers/net/slip/slip.c:756 [inline]\n slip_open+0x36d/0x1210 drivers/net/slip/slip.c:817\n tty_ldisc_open+0xa2/0x120 drivers/tty/tty_ldisc.c:433\n tty_set_ldisc+0x324/0x720 drivers/tty/tty_ldisc.c:564\n\n Freed by task 6497:\n device_release+0xa2/0x240 drivers/base/core.c:2507\n kobject_put+0x179/0x280 lib/kobject.c:729\n netdev_run_todo+0x6c8/0xef0 net/core/dev.c:10509\n slip_close+0x166/0x1c0 drivers/net/slip/slip.c:906\n tty_ldisc_close+0x113/0x1a0 drivers/tty/tty_ldisc.c:456\n tty_ldisc_kill+0x94/0x160 drivers/tty/tty_ldisc.c:614\n tty_ldisc_release+0xe3/0x2b0 drivers/tty/tty_ldisc.c:782\n tty_release+0xbcc/0xe70 drivers/tty/tty_io.c:1860\n\nCommit e58c19124189 (\"slip: Fix use-after-free Read in slip_open\") fixed\na different source of stale entries - a device left in slip_devs[] after\nslip_open() freed it on the registration error path - and does not\naddress this race, which is why the report survives it.\n\nDrop the entry from ndo_uninit instead. unregister_netdevice() calls\nndo_uninit under RTNL, before the device is queued to netdev_run_todo(),\nso an entry that sl_sync() can still see while holding RTNL belongs to a\ndevice that cannot be freed until RTNL is dropped. sl_free_netdev()\nstays only for the slip_open() error path, where register_netdevice()\nmay have failed before ndo_init and ndo_uninit is then not called\neither. Both running for the same device is harmless: the\n---truncated---", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81001" }, { "summary":"CVE-2026-81001 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-81001.json" }, { "summary":"openEuler-SA-2026-4591", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4591" }, { "summary":"CVE-2026-81001", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-81001&packageName=kernel" } ], "title":"openEuler cve CVE-2026-81001", "tracking":{ "initial_release_date":"2026-10-30T11:21:29+08:00", "revision_history":[ { "date":"2026-10-30T11:21:29+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-10-30T11:21:29+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-10-30T11:21:29+08:00", "id":"CVE-2026-81001", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"src", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"kernel-5.10.0-339.0.0.240.oe2203sp4.src.rpm", "name":"kernel-5.10.0-339.0.0.240.oe2203sp4.src.rpm" }, "name":"kernel-5.10.0-339.0.0.240.oe2203sp4.src.rpm", "category":"product_version" } ], "category":"architecture" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ 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use-after-free in sl_sync()\n\nslip_devs[] stores bare net_device pointers and takes no reference on\nthem. sl_sync() and sl_alloc() walk that table from slip_open() under\nrtnl_lock(), while an entry is dropped by sl_free_netdev(), which\nsl_setup() installs as dev->priv_destructor.\n\npriv_destructor is called from netdev_run_todo(), which deliberately\nruns with the RTNL semaphore released so that it can sleep while waiting\nfor the device refcount to drop:\n\n\t/* Snapshot list, allow later requests */\n\tlist_replace_init(&net_todo_list, &list);\n\n\t__rtnl_unlock();\n\t...\n\t\tif (dev->priv_destructor)\n\t\t\tdev->priv_destructor(dev);\t/* slip_devs[i] = NULL */\n\t\tif (dev->needs_free_netdev)\n\t\t\tfree_netdev(dev);\n\t\t...\n\t\t/* Free network device */\n\t\tkobject_put(&dev->dev.kobj);\n\nSo rtnl_lock() does not serialise slip_open() against the teardown at\nall. sl_sync() can load slip_devs[i] while the entry is still published\nand dereference it after netdev_run_todo() has run the destructor and\nreleased the device:\n\n CPU0 (slip_open) CPU1 (slip_close)\n unregister_netdev()\n rtnl_unlock()\n netdev_run_todo()\n __rtnl_unlock()\n rtnl_lock()\n sl_sync()\n dev = slip_devs[i]\n priv_destructor(dev)\n slip_devs[i] = NULL\n kobject_put(&dev->dev.kobj)\n /* dev is freed */\n sl = netdev_priv(dev)\n if (sl->tty || sl->leased) /* use-after-free */\n\n BUG: KASAN: use-after-free in sl_sync drivers/net/slip/slip.c:730 [inline]\n BUG: KASAN: use-after-free in slip_open+0xef4/0x1210 drivers/net/slip/slip.c:806\n Read of size 1 at addr ffff8880712dac71 by task syz-executor.2/6506\n\n CPU: 2 PID: 6506 Comm: syz-executor.2 Not tainted 6.1.134-syzkaller-00260-g0c8fc3469765 #0\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014\n Call Trace:\n sl_sync drivers/net/slip/slip.c:730 [inline]\n slip_open+0xef4/0x1210 drivers/net/slip/slip.c:806\n tty_ldisc_open+0xa2/0x120 drivers/tty/tty_ldisc.c:433\n tty_set_ldisc+0x324/0x720 drivers/tty/tty_ldisc.c:564\n tiocsetd drivers/tty/tty_io.c:2428 [inline]\n tty_ioctl+0x5f0/0x1530 drivers/tty/tty_io.c:2712\n\n Allocated by task 6502:\n alloc_netdev_mqs+0x98/0xfe0 net/core/dev.c:10719\n sl_alloc drivers/net/slip/slip.c:756 [inline]\n slip_open+0x36d/0x1210 drivers/net/slip/slip.c:817\n tty_ldisc_open+0xa2/0x120 drivers/tty/tty_ldisc.c:433\n tty_set_ldisc+0x324/0x720 drivers/tty/tty_ldisc.c:564\n\n Freed by task 6497:\n device_release+0xa2/0x240 drivers/base/core.c:2507\n kobject_put+0x179/0x280 lib/kobject.c:729\n netdev_run_todo+0x6c8/0xef0 net/core/dev.c:10509\n slip_close+0x166/0x1c0 drivers/net/slip/slip.c:906\n tty_ldisc_close+0x113/0x1a0 drivers/tty/tty_ldisc.c:456\n tty_ldisc_kill+0x94/0x160 drivers/tty/tty_ldisc.c:614\n tty_ldisc_release+0xe3/0x2b0 drivers/tty/tty_ldisc.c:782\n tty_release+0xbcc/0xe70 drivers/tty/tty_io.c:1860\n\nCommit e58c19124189 (\"slip: Fix use-after-free Read in slip_open\") fixed\na different source of stale entries - a device left in slip_devs[] after\nslip_open() freed it on the registration error path - and does not\naddress this race, which is why the report survives it.\n\nDrop the entry from ndo_uninit instead. unregister_netdevice() calls\nndo_uninit under RTNL, before the device is queued to netdev_run_todo(),\nso an entry that sl_sync() can still see while holding RTNL belongs to a\ndevice that cannot be freed until RTNL is dropped. sl_free_netdev()\nstays only for the slip_open() error path, where register_netdevice()\nmay have failed before ndo_init and ndo_uninit is then not called\neither. Both running for the same device is harmless: the\n---truncated---", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:kernel-5.10.0-339.0.0.240.oe2203sp4.src", "openEuler-22.03-LTS-SP4:bpftool-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-339.0.0.240.oe2203sp4.aarch64", 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