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CVE-2021-47162: Linux

9.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: tipc: skb_linearize the head skb when reassembling msgs It's not a good idea to append the frag skb to a skb's frag_list if the frag_list already has skbs from elsewhere, such as this skb was created by pskb_copy() where the frag_list was cloned (all the skbs in it were skb_get'ed) and shared by multiple skbs. However, the new appended frag skb should have been only seen by the current skb. Otherwise, it will cause use after free crashes as this appended frag skb are seen by multiple skbs but it only got skb_get called once. The same thing happens with a skb updated by pskb_may_pull() with a skb_cloned skb. Li Shuang has reported quite a few crashes caused by this when doing testing over macvlan devices: [] kernel BUG at net/core/skbuff.c:1970! [] Call Trace: [] skb_clone+0x4d/0xb0 [] macvlan_broadcast+0xd8/0x160 [macvlan] [] macvlan_process_broadcast+0x148/0x150 [macvlan] [] process_one_work+0x1a7/0x360 [] worker_thread+0x30/0x390 [] kernel BUG at mm/usercopy.c:102! [] Call Trace: [] __check_heap_object+0xd3/0x100 [] __check_object_size+0xff/0x16b [] simple_copy_to_iter+0x1c/0x30 [] __skb_datagram_iter+0x7d/0x310 [] __skb_datagram_iter+0x2a5/0x310 [] skb_copy_datagram_iter+0x3b/0x90 [] tipc_recvmsg+0x14a/0x3a0 [tipc] [] ____sys_recvmsg+0x91/0x150 [] ___sys_recvmsg+0x7b/0xc0 [] kernel BUG at mm/slub.c:305! [] Call Trace: [] <IRQ> [] kmem_cache_free+0x3ff/0x400 [] __netif_receive_skb_core+0x12c/0xc40 [] ? kmem_cache_alloc+0x12e/0x270 [] netif_receive_skb_internal+0x3d/0xb0 [] ? get_rx_page_info+0x8e/0xa0 [be2net] [] be_poll+0x6ef/0xd00 [be2net] [] ? irq_exit+0x4f/0x100 [] net_rx_action+0x149/0x3b0 ... This patch is to fix it by linearizing the head skb if it has frag_list set in tipc_buf_append(). Note that we choose to do this before calling skb_unshare(), as __skb_linearize() will avoid skb_copy(). Also, we

Засегнати продукти

  • Linux Linux: 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди b2c8d28c34b3070407cb1741f9ba3f15d0284b8b; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди 5489f30bb78ff0dafb4229a69632afc2ba20765c; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди 436d650d374329a591c30339a91fa5078052ed1e; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди 4b1761898861117c97066aea6c58f68a7787f0bf; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди 64d17ec9f1ded042c4b188d15734f33486ed9966; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди 6da24cfc83ba4f97ea44fc7ae9999a006101755c; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди ace300eecbccaa698e2b472843c74a5f33f7dce8; 45c8b7b175ceb2d542e0fe15247377bf3bce29ec преди b7df21cf1b79ab7026f545e7bf837bd5750ac026; d45ed6c1ff20d3640a31f03816ca2d48fb7d6f22; c19282fd54a19e4651a4e67836cd842082546677; 4.1.14 преди 4.2; 4.2.7 преди 4.3
  • Linux Linux: 4.3; преди 4.3; 4.4.271 до 4.4.*; 4.9.271 до 4.9.*; 4.14.235 до 4.14.*; 4.19.193 до 4.19.*; 5.4.124 до 5.4.*; 5.10.42 до 5.10.*; 5.12.9 до 5.12.*; от 5.13 нататък

История

  • 25 март 2024 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2021-47162: Linux | freedomonline.bg