CVE-2024-26635
Vulnerability from cvelistv5
Published
2024-03-18 10:14
Modified
2024-12-19 08:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: llc: Drop support for ETH_P_TR_802_2. syzbot reported an uninit-value bug below. [0] llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2 (0x0011), and syzbot abused the latter to trigger the bug. write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', "90e5dd"}}}}, 0x16) llc_conn_handler() initialises local variables {saddr,daddr}.mac based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes them to __llc_lookup(). However, the initialisation is done only when skb->protocol is htons(ETH_P_802_2), otherwise, __llc_lookup_established() and __llc_lookup_listener() will read garbage. The missing initialisation existed prior to commit 211ed865108e ("net: delete all instances of special processing for token ring"). It removed the part to kick out the token ring stuff but forgot to close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv(). Let's remove llc_tr_packet_type and complete the deprecation. [0]: BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90 __llc_lookup_established+0xe9d/0xf90 __llc_lookup net/llc/llc_conn.c:611 [inline] llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 __netif_receive_skb_one_core net/core/dev.c:5527 [inline] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641 netif_receive_skb_internal net/core/dev.c:5727 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5786 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x8ef/0x1490 fs/read_write.c:584 ksys_write+0x20f/0x4c0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable daddr created at: llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 CPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ccdef19cf9497c2803b005369668feb91cacdfd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b8e8838f82f332ae80c643dbb1ca4418d0628097
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df57fc2f2abf548aa889a36ab0bdcc94a75399dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3f9bed9bee261e3347131764e42aeedf1ffea61
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1f34a515fb1e25e85dee94f781e7869ae351fb8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9ccdef19cf9497c2803b005369668feb91cacdfd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b8e8838f82f332ae80c643dbb1ca4418d0628097
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/df57fc2f2abf548aa889a36ab0bdcc94a75399dc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e3f9bed9bee261e3347131764e42aeedf1ffea61
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1f34a515fb1e25e85dee94f781e7869ae351fb8
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
Vendor Product Version
Linux Linux Version: 3.5
Show details on NVD website


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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26635\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-18T11:15:10.203\",\"lastModified\":\"2024-11-21T09:02:44.140\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nllc: Drop support for ETH_P_TR_802_2.\\n\\nsyzbot reported an uninit-value bug below. [0]\\n\\nllc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2\\n(0x0011), and syzbot abused the latter to trigger the bug.\\n\\n  write$tun(r0, \u0026(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, \u0027)\u0027, \\\"90e5dd\\\"}}}}, 0x16)\\n\\nllc_conn_handler() initialises local variables {saddr,daddr}.mac\\nbased on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes\\nthem to __llc_lookup().\\n\\nHowever, the initialisation is done only when skb-\u003eprotocol is\\nhtons(ETH_P_802_2), otherwise, __llc_lookup_established() and\\n__llc_lookup_listener() will read garbage.\\n\\nThe missing initialisation existed prior to commit 211ed865108e\\n(\\\"net: delete all instances of special processing for token ring\\\").\\n\\nIt removed the part to kick out the token ring stuff but forgot to\\nclose the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv().\\n\\nLet\u0027s remove llc_tr_packet_type and complete the deprecation.\\n\\n[0]:\\nBUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90\\n __llc_lookup_established+0xe9d/0xf90\\n __llc_lookup net/llc/llc_conn.c:611 [inline]\\n llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791\\n llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206\\n __netif_receive_skb_one_core net/core/dev.c:5527 [inline]\\n __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641\\n netif_receive_skb_internal net/core/dev.c:5727 [inline]\\n netif_receive_skb+0x58/0x660 net/core/dev.c:5786\\n tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\\n tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\\n tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n call_write_iter include/linux/fs.h:2020 [inline]\\n new_sync_write fs/read_write.c:491 [inline]\\n vfs_write+0x8ef/0x1490 fs/read_write.c:584\\n ksys_write+0x20f/0x4c0 fs/read_write.c:637\\n __do_sys_write fs/read_write.c:649 [inline]\\n __se_sys_write fs/read_write.c:646 [inline]\\n __x64_sys_write+0x93/0xd0 fs/read_write.c:646\\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nLocal variable daddr created at:\\n llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783\\n llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206\\n\\nCPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: llc: Eliminaci\u00f3n del soporte para ETH_P_TR_802_2. syzbot inform\u00f3 un error de valor uninit a continuaci\u00f3n. [0] llc admite ETH_P_802_2 (0x0004) y sol\u00eda admitir ETH_P_TR_802_2 (0x0011), y syzbot abus\u00f3 de este \u00faltimo para desencadenar el error. escribir$tun(r0, \u0026amp;(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, \u0027)\u0027, \\\"90e5dd\\\" }}}}, 0x16) llc_conn_handler() inicializa las variables locales {saddr,daddr}.mac basadas en skb en llc_pdu_decode_sa()/llc_pdu_decode_da() y las pasa a __llc_lookup(). Sin embargo, la inicializaci\u00f3n se realiza solo cuando skb-\u0026gt;protocol es htons(ETH_P_802_2); de lo contrario, __llc_lookup_establecido() y __llc_lookup_listener() leer\u00e1n basura. La inicializaci\u00f3n faltante exist\u00eda antes de el commit 211ed865108e (\\\"net: eliminar todas las instancias de procesamiento especial para Token Ring\\\"). Quit\u00f3 la parte para expulsar el token ring, pero se olvid\u00f3 de cerrar la puerta permitiendo que los paquetes ETH_P_TR_802_2 se colaran en llc_rcv(). Eliminemos llc_tr_packet_type y completemos la desaprobaci\u00f3n. [0]: ERROR: KMSAN: valor uninit en __llc_lookup_establecido+0xe9d/0xf90 __llc_lookup_establecido+0xe9d/0xf90 __llc_lookup net/llc/llc_conn.c:611 [en l\u00ednea] llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:79 1 llc_rcv +0xfbb/0x14a0 net/llc/llc_input.c:206 __netif_receive_skb_one_core net/core/dev.c:5527 [en l\u00ednea] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641 netif_receive_skb_internal net/core/dev.c:5727 [en l\u00ednea] netif_receive_skb+0x58/0x660 net/core/dev.c:5786 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2020 [en l\u00ednea] new_sync_write fs/read_write.c:491 [en l\u00ednea] vfs_write+0x8ef/0x1490 fs/read_write.c:584 ksys_write+0x20f/0x4c0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [en l\u00ednea] __se_sys_write fs/read_write.c:646 [en l\u00ednea] __x64_sys_write+0x93/0xd0 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common. c: 51 [en l\u00ednea] do_syscall_64+0x44/0x110 arch/x86/entry/comunes.c: 82 entry_syscall_64_after_hwframe+0x63/0x6b local variable daddr creado FBB /0x14a0 net/llc/llc_input.c:206 CPU: 1 PID: 5004 Comm: syz-executor994 No contaminado 6.6.0-syzkaller-14500-g1c41041124bd #0 Nombre de hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 10 /09/2023\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ccdef19cf9497c2803b005369668feb91cacdfd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b8e8838f82f332ae80c643dbb1ca4418d0628097\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df57fc2f2abf548aa889a36ab0bdcc94a75399dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3f9bed9bee261e3347131764e42aeedf1ffea61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1f34a515fb1e25e85dee94f781e7869ae351fb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9ccdef19cf9497c2803b005369668feb91cacdfd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/b8e8838f82f332ae80c643dbb1ca4418d0628097\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/df57fc2f2abf548aa889a36ab0bdcc94a75399dc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e3f9bed9bee261e3347131764e42aeedf1ffea61\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f1f34a515fb1e25e85dee94f781e7869ae351fb8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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