ghsa-79xj-p645-3ffq
Vulnerability from github
Published
2025-09-18 18:30
Modified
2025-09-18 18:30
Details

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

net: add vlan_get_protocol_and_depth() helper

Before blamed commit, pskb_may_pull() was used instead of skb_header_pointer() in __vlan_get_protocol() and friends.

Few callers depended on skb->head being populated with MAC header, syzbot caught one of them (skb_mac_gso_segment())

Add vlan_get_protocol_and_depth() to make the intent clearer and use it where sensible.

This is a more generic fix than commit e9d3f80935b6 ("net/af_packet: make sure to pull mac header") which was dealing with a similar issue.

kernel BUG at include/linux/skbuff.h:2655 ! invalid opcode: 0000 [#1] SMP KASAN CPU: 0 PID: 1441 Comm: syz-executor199 Not tainted 6.1.24-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:__skb_pull include/linux/skbuff.h:2655 [inline] RIP: 0010:skb_mac_gso_segment+0x68f/0x6a0 net/core/gro.c:136 Code: fd 48 8b 5c 24 10 44 89 6b 70 48 c7 c7 c0 ae 0d 86 44 89 e6 e8 a1 91 d0 00 48 c7 c7 00 af 0d 86 48 89 de 31 d2 e8 d1 4a e9 ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 RSP: 0018:ffffc90001bd7520 EFLAGS: 00010286 RAX: ffffffff8469736a RBX: ffff88810f31dac0 RCX: ffff888115a18b00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001bd75e8 R08: ffffffff84697183 R09: fffff5200037adf9 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000012 R13: 000000000000fee5 R14: 0000000000005865 R15: 000000000000fed7 FS: 000055555633f300(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 0000000116fea000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: [] __skb_gso_segment+0x32d/0x4c0 net/core/dev.c:3419 [] skb_gso_segment include/linux/netdevice.h:4819 [inline] [] validate_xmit_skb+0x3aa/0xee0 net/core/dev.c:3725 [] __dev_queue_xmit+0x1332/0x3300 net/core/dev.c:4313 [] dev_queue_xmit+0x17/0x20 include/linux/netdevice.h:3029 [] packet_snd net/packet/af_packet.c:3111 [inline] [] packet_sendmsg+0x49d2/0x6470 net/packet/af_packet.c:3142 [] sock_sendmsg_nosec net/socket.c:716 [inline] [] sock_sendmsg net/socket.c:736 [inline] [] __sys_sendto+0x472/0x5f0 net/socket.c:2139 [] __do_sys_sendto net/socket.c:2151 [inline] [] __se_sys_sendto net/socket.c:2147 [inline] [] __x64_sys_sendto+0xe5/0x100 net/socket.c:2147 [] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [] do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80 [] entry_SYSCALL_64_after_hwframe+0x63/0xcd

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53433"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-18T16:15:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add vlan_get_protocol_and_depth() helper\n\nBefore blamed commit, pskb_may_pull() was used instead\nof skb_header_pointer() in __vlan_get_protocol() and friends.\n\nFew callers depended on skb-\u003ehead being populated with MAC header,\nsyzbot caught one of them (skb_mac_gso_segment())\n\nAdd vlan_get_protocol_and_depth() to make the intent clearer\nand use it where sensible.\n\nThis is a more generic fix than commit e9d3f80935b6\n(\"net/af_packet: make sure to pull mac header\") which was\ndealing with a similar issue.\n\nkernel BUG at include/linux/skbuff.h:2655 !\ninvalid opcode: 0000 [#1] SMP KASAN\nCPU: 0 PID: 1441 Comm: syz-executor199 Not tainted 6.1.24-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023\nRIP: 0010:__skb_pull include/linux/skbuff.h:2655 [inline]\nRIP: 0010:skb_mac_gso_segment+0x68f/0x6a0 net/core/gro.c:136\nCode: fd 48 8b 5c 24 10 44 89 6b 70 48 c7 c7 c0 ae 0d 86 44 89 e6 e8 a1 91 d0 00 48 c7 c7 00 af 0d 86 48 89 de 31 d2 e8 d1 4a e9 ff \u003c0f\u003e 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41\nRSP: 0018:ffffc90001bd7520 EFLAGS: 00010286\nRAX: ffffffff8469736a RBX: ffff88810f31dac0 RCX: ffff888115a18b00\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\nRBP: ffffc90001bd75e8 R08: ffffffff84697183 R09: fffff5200037adf9\nR10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000012\nR13: 000000000000fee5 R14: 0000000000005865 R15: 000000000000fed7\nFS: 000055555633f300(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020000000 CR3: 0000000116fea000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\u003cTASK\u003e\n[\u003cffffffff847018dd\u003e] __skb_gso_segment+0x32d/0x4c0 net/core/dev.c:3419\n[\u003cffffffff8470398a\u003e] skb_gso_segment include/linux/netdevice.h:4819 [inline]\n[\u003cffffffff8470398a\u003e] validate_xmit_skb+0x3aa/0xee0 net/core/dev.c:3725\n[\u003cffffffff84707042\u003e] __dev_queue_xmit+0x1332/0x3300 net/core/dev.c:4313\n[\u003cffffffff851a9ec7\u003e] dev_queue_xmit+0x17/0x20 include/linux/netdevice.h:3029\n[\u003cffffffff851b4a82\u003e] packet_snd net/packet/af_packet.c:3111 [inline]\n[\u003cffffffff851b4a82\u003e] packet_sendmsg+0x49d2/0x6470 net/packet/af_packet.c:3142\n[\u003cffffffff84669a12\u003e] sock_sendmsg_nosec net/socket.c:716 [inline]\n[\u003cffffffff84669a12\u003e] sock_sendmsg net/socket.c:736 [inline]\n[\u003cffffffff84669a12\u003e] __sys_sendto+0x472/0x5f0 net/socket.c:2139\n[\u003cffffffff84669c75\u003e] __do_sys_sendto net/socket.c:2151 [inline]\n[\u003cffffffff84669c75\u003e] __se_sys_sendto net/socket.c:2147 [inline]\n[\u003cffffffff84669c75\u003e] __x64_sys_sendto+0xe5/0x100 net/socket.c:2147\n[\u003cffffffff8551d40f\u003e] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n[\u003cffffffff8551d40f\u003e] do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80\n[\u003cffffffff85600087\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd",
  "id": "GHSA-79xj-p645-3ffq",
  "modified": "2025-09-18T18:30:28Z",
  "published": "2025-09-18T18:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53433"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15eaeb8941f12fcc2713c4bf6eb8f76a37854b4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34a5ee69ec6273f0aee79e7ce4d14afc83ca8122"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4063384ef762cc5946fc7a3f89879e76c6ec51e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4188c5269475ac59d467b5814c5df02756f6d907"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55caf900e13cd04466def08173a14b41d18c19c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9dd9ffe118415b4ac1cebac43443000072bc8f46"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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