{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2021-47247", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix use-after-free of encap entry in neigh update handler\n\nFunction mlx5e_rep_neigh_update() wasn't updated to accommodate rtnl lock\nremoval from TC filter update path and properly handle concurrent encap\nentry insertion/deletion which can lead to following use-after-free:\n\n [23827.464923] ==================================================================\n [23827.469446] BUG: KASAN: use-after-free in mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.470971] Read of size 4 at addr ffff8881d132228c by task kworker/u20:6/21635\n [23827.472251]\n [23827.472615] CPU: 9 PID: 21635 Comm: kworker/u20:6 Not tainted 5.13.0-rc3+ #5\n [23827.473788] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n [23827.475639] Workqueue: mlx5e mlx5e_rep_neigh_update [mlx5_core]\n [23827.476731] Call Trace:\n [23827.477260] dump_stack+0xbb/0x107\n [23827.477906] print_address_description.constprop.0+0x18/0x140\n [23827.478896] ? mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.479879] ? mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.480905] kasan_report.cold+0x7c/0xd8\n [23827.481701] ? mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.482744] kasan_check_range+0x145/0x1a0\n [23827.493112] mlx5e_encap_take+0x72/0x140 [mlx5_core]\n [23827.494054] ? mlx5e_tc_tun_encap_info_equal_generic+0x140/0x140 [mlx5_core]\n [23827.495296] mlx5e_rep_neigh_update+0x41e/0x5e0 [mlx5_core]\n [23827.496338] ? mlx5e_rep_neigh_entry_release+0xb80/0xb80 [mlx5_core]\n [23827.497486] ? read_word_at_a_time+0xe/0x20\n [23827.498250] ? strscpy+0xa0/0x2a0\n [23827.498889] process_one_work+0x8ac/0x14e0\n [23827.499638] ? lockdep_hardirqs_on_prepare+0x400/0x400\n [23827.500537] ? pwq_dec_nr_in_flight+0x2c0/0x2c0\n [23827.501359] ? rwlock_bug.part.0+0x90/0x90\n [23827.502116] worker_thread+0x53b/0x1220\n [23827.502831] ? process_one_work+0x14e0/0x14e0\n [23827.503627] kthread+0x328/0x3f0\n [23827.504254] ? _raw_spin_unlock_irq+0x24/0x40\n [23827.505065] ? __kthread_bind_mask+0x90/0x90\n [23827.505912] ret_from_fork+0x1f/0x30\n [23827.506621]\n [23827.506987] Allocated by task 28248:\n [23827.507694] kasan_save_stack+0x1b/0x40\n [23827.508476] __kasan_kmalloc+0x7c/0x90\n [23827.509197] mlx5e_attach_encap+0xde1/0x1d40 [mlx5_core]\n [23827.510194] mlx5e_tc_add_fdb_flow+0x397/0xc40 [mlx5_core]\n [23827.511218] __mlx5e_add_fdb_flow+0x519/0xb30 [mlx5_core]\n [23827.512234] mlx5e_configure_flower+0x191c/0x4870 [mlx5_core]\n [23827.513298] tc_setup_cb_add+0x1d5/0x420\n [23827.514023] fl_hw_replace_filter+0x382/0x6a0 [cls_flower]\n [23827.514975] fl_change+0x2ceb/0x4a51 [cls_flower]\n [23827.515821] tc_new_tfilter+0x89a/0x2070\n [23827.516548] rtnetlink_rcv_msg+0x644/0x8c0\n [23827.517300] netlink_rcv_skb+0x11d/0x340\n [23827.518021] netlink_unicast+0x42b/0x700\n [23827.518742] netlink_sendmsg+0x743/0xc20\n [23827.519467] sock_sendmsg+0xb2/0xe0\n [23827.520131] ____sys_sendmsg+0x590/0x770\n [23827.520851] ___sys_sendmsg+0xd8/0x160\n [23827.521552] __sys_sendmsg+0xb7/0x140\n [23827.522238] do_syscall_64+0x3a/0x70\n [23827.522907] entry_SYSCALL_64_after_hwframe+0x44/0xae\n [23827.523797]\n [23827.524163] Freed by task 25948:\n [23827.524780] kasan_save_stack+0x1b/0x40\n [23827.525488] kasan_set_track+0x1c/0x30\n [23827.526187] kasan_set_free_info+0x20/0x30\n [23827.526968] __kasan_slab_free+0xed/0x130\n [23827.527709] slab_free_freelist_hook+0xcf/0x1d0\n [23827.528528] kmem_cache_free_bulk+0x33a/0x6e0\n [23827.529317] kfree_rcu_work+0x55f/0xb70\n [23827.530024] process_one_work+0x8ac/0x14e0\n [23827.530770] worker_thread+0x53b/0x1220\n [23827.531480] kthread+0x328/0x3f0\n [23827.532114] ret_from_fork+0x1f/0x30\n [23827.532785]\n [23827.533147] Last potentially related work creation:\n [23827.534007] kasan_save_stack+0x1b/0x40\n [23827.534710] kasan_record_aux_stack+0xab/0xc0\n [23827.535492] kvfree_call_rcu+0x31/0x7b0\n [23827.536206] mlx5e_tc_del\n---truncated---" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "2a1f1768fa17", "version_value": "b6447b72aca5" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "5.4", "status": "affected" }, { "version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "custom" }, { "version": "5.12.13", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/b6447b72aca571632e71bb73a797118d5ce46a93", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/b6447b72aca571632e71bb73a797118d5ce46a93" }, { "url": "https://git.kernel.org/stable/c/fb1a3132ee1ac968316e45d21a48703a6db0b6c3", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/fb1a3132ee1ac968316e45d21a48703a6db0b6c3" } ] }, "generator": { "engine": "bippy-a5840b7849dd" } }