ghsa-g4gj-3g5h-w4h5
Vulnerability from github
Published
2024-05-21 18:31
Modified
2024-06-03 18:55
Severity
7.8 (High) - CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

af_unix: fix use-after-free in unix_stream_read_actor()

syzbot reported the following crash [1]

After releasing unix socket lock, u->oob_skb can be changed by another thread. We must temporarily increase skb refcount to make sure this other thread will not free the skb under us.

[1]

BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 Read of size 4 at addr ffff88801f3b9cc4 by task syz-executor107/5297

CPU: 1 PID: 5297 Comm: syz-executor107 Not tainted 6.6.0-syzkaller-15910-gb8e3a87a627b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866 unix_stream_recv_urg net/unix/af_unix.c:2587 [inline] unix_stream_read_generic+0x19a5/0x2480 net/unix/af_unix.c:2666 unix_stream_recvmsg+0x189/0x1b0 net/unix/af_unix.c:2903 sock_recvmsg_nosec net/socket.c:1044 [inline] sock_recvmsg+0xe2/0x170 net/socket.c:1066 _sysrecvmsg+0x21f/0x5c0 net/socket.c:2803 _sys_recvmsg+0x115/0x1a0 net/socket.c:2845 __sys_recvmsg+0x114/0x1e0 net/socket.c:2875 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fc67492c559 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc6748ab228 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007fc67492c559 RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007fc6749b6348 R08: 00007fc6748ab6c0 R09: 00007fc6748ab6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc6749b6340 R13: 00007fc6749b634c R14: 00007ffe9fac52a0 R15: 00007ffe9fac5388

Allocated by task 5295: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x180/0x3c0 mm/slub.c:3523 __alloc_skb+0x287/0x330 net/core/skbuff.c:641 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331 sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780 sock_alloc_send_skb include/net/sock.h:1884 [inline] queue_oob net/unix/af_unix.c:2147 [inline] unix_stream_sendmsg+0xb5f/0x10a0 net/unix/af_unix.c:2301 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 _syssendmsg+0x6ac/0x940 net/socket.c:2584 _sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Freed by task 5295: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 _kasanslab_free mm/kasan/common.c:236 [inline] __kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] kmem_cache_free+0xf8/0x340 mm/slub.c:3831 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:1015 __kfree_skb net/core/skbuff.c:1073 [inline] consume_skb net/core/skbuff.c:1288 [inline] consume_skb+0xdf/0x170 net/core/skbuff.c:1282 queue_oob net/unix/af_unix.c:2178 [inline] u ---truncated---

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{
  "affected": [],
  "aliases": [
    "CVE-2023-52772"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T16:15:16Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: fix use-after-free in unix_stream_read_actor()\n\nsyzbot reported the following crash [1]\n\nAfter releasing unix socket lock, u-\u003eoob_skb can be changed\nby another thread. We must temporarily increase skb refcount\nto make sure this other thread will not free the skb under us.\n\n[1]\n\nBUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866\nRead of size 4 at addr ffff88801f3b9cc4 by task syz-executor107/5297\n\nCPU: 1 PID: 5297 Comm: syz-executor107 Not tainted 6.6.0-syzkaller-15910-gb8e3a87a627b #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023\nCall Trace:\n\u003cTASK\u003e\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:364 [inline]\nprint_report+0xc4/0x620 mm/kasan/report.c:475\nkasan_report+0xda/0x110 mm/kasan/report.c:588\nunix_stream_read_actor+0xa7/0xc0 net/unix/af_unix.c:2866\nunix_stream_recv_urg net/unix/af_unix.c:2587 [inline]\nunix_stream_read_generic+0x19a5/0x2480 net/unix/af_unix.c:2666\nunix_stream_recvmsg+0x189/0x1b0 net/unix/af_unix.c:2903\nsock_recvmsg_nosec net/socket.c:1044 [inline]\nsock_recvmsg+0xe2/0x170 net/socket.c:1066\n____sys_recvmsg+0x21f/0x5c0 net/socket.c:2803\n___sys_recvmsg+0x115/0x1a0 net/socket.c:2845\n__sys_recvmsg+0x114/0x1e0 net/socket.c:2875\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82\nentry_SYSCALL_64_after_hwframe+0x63/0x6b\nRIP: 0033:0x7fc67492c559\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fc6748ab228 EFLAGS: 00000246 ORIG_RAX: 000000000000002f\nRAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007fc67492c559\nRDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004\nRBP: 00007fc6749b6348 R08: 00007fc6748ab6c0 R09: 00007fc6748ab6c0\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007fc6749b6340\nR13: 00007fc6749b634c R14: 00007ffe9fac52a0 R15: 00007ffe9fac5388\n\u003c/TASK\u003e\n\nAllocated by task 5295:\nkasan_save_stack+0x33/0x50 mm/kasan/common.c:45\nkasan_set_track+0x25/0x30 mm/kasan/common.c:52\n__kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328\nkasan_slab_alloc include/linux/kasan.h:188 [inline]\nslab_post_alloc_hook mm/slab.h:763 [inline]\nslab_alloc_node mm/slub.c:3478 [inline]\nkmem_cache_alloc_node+0x180/0x3c0 mm/slub.c:3523\n__alloc_skb+0x287/0x330 net/core/skbuff.c:641\nalloc_skb include/linux/skbuff.h:1286 [inline]\nalloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331\nsock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780\nsock_alloc_send_skb include/net/sock.h:1884 [inline]\nqueue_oob net/unix/af_unix.c:2147 [inline]\nunix_stream_sendmsg+0xb5f/0x10a0 net/unix/af_unix.c:2301\nsock_sendmsg_nosec net/socket.c:730 [inline]\n__sock_sendmsg+0xd5/0x180 net/socket.c:745\n____sys_sendmsg+0x6ac/0x940 net/socket.c:2584\n___sys_sendmsg+0x135/0x1d0 net/socket.c:2638\n__sys_sendmsg+0x117/0x1e0 net/socket.c:2667\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82\nentry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nFreed by task 5295:\nkasan_save_stack+0x33/0x50 mm/kasan/common.c:45\nkasan_set_track+0x25/0x30 mm/kasan/common.c:52\nkasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522\n____kasan_slab_free mm/kasan/common.c:236 [inline]\n____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200\nkasan_slab_free include/linux/kasan.h:164 [inline]\nslab_free_hook mm/slub.c:1800 [inline]\nslab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826\nslab_free mm/slub.c:3809 [inline]\nkmem_cache_free+0xf8/0x340 mm/slub.c:3831\nkfree_skbmem+0xef/0x1b0 net/core/skbuff.c:1015\n__kfree_skb net/core/skbuff.c:1073 [inline]\nconsume_skb net/core/skbuff.c:1288 [inline]\nconsume_skb+0xdf/0x170 net/core/skbuff.c:1282\nqueue_oob net/unix/af_unix.c:2178 [inline]\nu\n---truncated---",
  "id": "GHSA-g4gj-3g5h-w4h5",
  "modified": "2024-06-03T18:55:26Z",
  "published": "2024-05-21T18:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52772"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/069a3ec329ff43e7869a3d94c62cd03203016bce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b7b492615cf3017190f55444f7016812b66611d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75bcfc188abf4fae9c1d5f5dc0a03540be602eef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d179189eec426fe4801e4b91efa1889faed12700"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eae0b295ce16d8c8b4114c3037993191b4bb92f0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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