ghsa-gxhp-q3mw-vmqh
Vulnerability from github
Published
2024-09-04 21:30
Modified
2024-09-06 18:31
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Details

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

gtp: pull network headers in gtp_dev_xmit()

syzbot/KMSAN reported use of uninit-value in get_dev_xmit() [1]

We must make sure the IPv4 or Ipv6 header is pulled in skb->head before accessing fields in them.

Use pskb_inet_may_pull() to fix this issue.

[1] BUG: KMSAN: uninit-value in ipv6_pdp_find drivers/net/gtp.c:220 [inline] BUG: KMSAN: uninit-value in gtp_build_skb_ip6 drivers/net/gtp.c:1229 [inline] BUG: KMSAN: uninit-value in gtp_dev_xmit+0x1424/0x2540 drivers/net/gtp.c:1281 ipv6_pdp_find drivers/net/gtp.c:220 [inline] gtp_build_skb_ip6 drivers/net/gtp.c:1229 [inline] gtp_dev_xmit+0x1424/0x2540 drivers/net/gtp.c:1281 __netdev_start_xmit include/linux/netdevice.h:4913 [inline] netdev_start_xmit include/linux/netdevice.h:4922 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3596 __dev_queue_xmit+0x358c/0x5610 net/core/dev.c:4423 dev_queue_xmit include/linux/netdevice.h:3105 [inline] packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3145 [inline] packet_sendmsg+0x90e3/0xa3a0 net/packet/af_packet.c:3177 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:745 __sys_sendto+0x685/0x830 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2212 x64_sys_call+0x3799/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at: slab_post_alloc_hook mm/slub.c:3994 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4080 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:583 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:674 alloc_skb include/linux/skbuff.h:1320 [inline] alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6526 sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2815 packet_alloc_skb net/packet/af_packet.c:2994 [inline] packet_snd net/packet/af_packet.c:3088 [inline] packet_sendmsg+0x749c/0xa3a0 net/packet/af_packet.c:3177 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:745 __sys_sendto+0x685/0x830 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2212 x64_sys_call+0x3799/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 7115 Comm: syz.1.515 Not tainted 6.11.0-rc1-syzkaller-00043-g94ede2a3e913 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024

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{
  "affected": [],
  "aliases": [
    "CVE-2024-44999"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-04T20:15:08Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: pull network headers in gtp_dev_xmit()\n\nsyzbot/KMSAN reported use of uninit-value in get_dev_xmit() [1]\n\nWe must make sure the IPv4 or Ipv6 header is pulled in skb-\u003ehead\nbefore accessing fields in them.\n\nUse pskb_inet_may_pull() to fix this issue.\n\n[1]\nBUG: KMSAN: uninit-value in ipv6_pdp_find drivers/net/gtp.c:220 [inline]\n BUG: KMSAN: uninit-value in gtp_build_skb_ip6 drivers/net/gtp.c:1229 [inline]\n BUG: KMSAN: uninit-value in gtp_dev_xmit+0x1424/0x2540 drivers/net/gtp.c:1281\n  ipv6_pdp_find drivers/net/gtp.c:220 [inline]\n  gtp_build_skb_ip6 drivers/net/gtp.c:1229 [inline]\n  gtp_dev_xmit+0x1424/0x2540 drivers/net/gtp.c:1281\n  __netdev_start_xmit include/linux/netdevice.h:4913 [inline]\n  netdev_start_xmit include/linux/netdevice.h:4922 [inline]\n  xmit_one net/core/dev.c:3580 [inline]\n  dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3596\n  __dev_queue_xmit+0x358c/0x5610 net/core/dev.c:4423\n  dev_queue_xmit include/linux/netdevice.h:3105 [inline]\n  packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\n  packet_snd net/packet/af_packet.c:3145 [inline]\n  packet_sendmsg+0x90e3/0xa3a0 net/packet/af_packet.c:3177\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:745\n  __sys_sendto+0x685/0x830 net/socket.c:2204\n  __do_sys_sendto net/socket.c:2216 [inline]\n  __se_sys_sendto net/socket.c:2212 [inline]\n  __x64_sys_sendto+0x125/0x1d0 net/socket.c:2212\n  x64_sys_call+0x3799/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:45\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n  slab_post_alloc_hook mm/slub.c:3994 [inline]\n  slab_alloc_node mm/slub.c:4037 [inline]\n  kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4080\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:583\n  __alloc_skb+0x363/0x7b0 net/core/skbuff.c:674\n  alloc_skb include/linux/skbuff.h:1320 [inline]\n  alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6526\n  sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2815\n  packet_alloc_skb net/packet/af_packet.c:2994 [inline]\n  packet_snd net/packet/af_packet.c:3088 [inline]\n  packet_sendmsg+0x749c/0xa3a0 net/packet/af_packet.c:3177\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:745\n  __sys_sendto+0x685/0x830 net/socket.c:2204\n  __do_sys_sendto net/socket.c:2216 [inline]\n  __se_sys_sendto net/socket.c:2212 [inline]\n  __x64_sys_sendto+0x125/0x1d0 net/socket.c:2212\n  x64_sys_call+0x3799/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:45\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCPU: 0 UID: 0 PID: 7115 Comm: syz.1.515 Not tainted 6.11.0-rc1-syzkaller-00043-g94ede2a3e913 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024",
  "id": "GHSA-gxhp-q3mw-vmqh",
  "modified": "2024-09-06T18:31:29Z",
  "published": "2024-09-04T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44999"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/137d565ab89ce3584503b443bc9e00d44f482593"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f6b62392453d8f36685d19b761307a8c5617ac1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34ba4f29f3d9eb52dee37512059efb2afd7e966f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3939d787139e359b77aaf9485d1e145d6713d7b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a3be7ff9224f424e485287b54be00d2c6bd9c40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d89d0c4a1c6d4d2a755e826351b0a101dbc86f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbb9a969fc190e85195d1b0f08038e7f6199044e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5dda8db382c5751c4e572afc7c99df7da1f83ca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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