{"uuid": "96eaa0d9-796c-4b49-857f-178f675783f8", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2024-47711", "type": "seen", "source": "https://t.me/cvedetector/8464", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2024-47711 - Here is a title for the vulnerability: \"MSV-SUSE-Vulnerability: Linux Unix/AF_UNIX Use-After-Free Vulnerability (VRF)\"\", \n  \"Content\": \"CVE ID : CVE-2024-47711 \nPublished : Oct. 21, 2024, 12:15 p.m. | 41\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \naf_unix: Don't return OOB skb in manage_oob().  \n  \nsyzbot reported use-after-free in unix_stream_recv_urg(). [0]  \n  \nThe scenario is  \n  \n  1. send(MSG_OOB)  \n  2. recv(MSG_OOB)  \n     -> The consumed OOB remains in recv queue  \n  3. send(MSG_OOB)  \n  4. recv()  \n     -> manage_oob() returns the next skb of the consumed OOB  \n     -> This is also OOB, but unix_sk(sk)->oob_skb is not cleared  \n  5. recv(MSG_OOB)  \n     -> unix_sk(sk)->oob_skb is used but already freed  \n  \nThe recent commit 8594d9b85c07 (\"af_unix: Don't call skb_get() for OOB  \nskb.\") uncovered the issue.  \n  \nIf the OOB skb is consumed and the next skb is peeked in manage_oob(),  \nwe still need to check if the skb is OOB.  \n  \nLet's do so by falling back to the following checks in manage_oob()  \nand add the test case in selftest.  \n  \nNote that we need to add a similar check for SIOCATMARK.  \n  \n[0]:  \nBUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959  \nRead of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235  \n  \nCPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0  \nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024  \nCall Trace:  \n   \n __dump_stack lib/dump_stack.c:93 [inline]  \n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119  \n print_address_description mm/kasan/report.c:377 [inline]  \n print_report+0x169/0x550 mm/kasan/report.c:488  \n kasan_report+0x143/0x180 mm/kasan/report.c:601  \n unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959  \n unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640  \n unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778  \n unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996  \n sock_recvmsg_nosec net/socket.c:1046 [inline]  \n sock_recvmsg+0x22f/0x280 net/socket.c:1068  \n ____sys_recvmsg+0x1db/0x470 net/socket.c:2816  \n ___sys_recvmsg net/socket.c:2858 [inline]  \n __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888  \n do_syscall_x64 arch/x86/entry/common.c:52 [inline]  \n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83  \n entry_SYSCALL_64_after_hwframe+0x77/0x7f  \nRIP: 0033:0x7f5360d6b4e9  \nCode: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <483d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48  \nRSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f  \nRAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9  \nRDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003  \nRBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000  \nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001  \nR13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001  \n   \n  \nAllocated by task 5235:  \n kasan_save_stack mm/kasan/common.c:47 [inline]  \n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68  \n unpoison_slab_object mm/kasan/common.c:312 [inline]  \n __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338  \n kasan_slab_alloc include/linux/kasan.h:201 [inline]  \n slab_post_alloc_hook mm/slub.c:3988 [inline]  \n slab_alloc_node mm/slub.c:4037 [inline]  \n kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080  \n __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667  \n alloc_skb include/linux/skbuff.h:1320 [inline]  \n alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528  \n sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815  \n sock_alloc_send_skb include/net/sock.h:1778 [inline]  \n queue_oob+0x108/0x680 net/unix/af_unix.c:2198  \n unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351  \n sock_sendmsg_nosec net/socket.c:730 [inline]  \n __sock_sendmsg+[...]", "creation_timestamp": "2024-10-21T15:09:50.000000Z"}