fkie_cve-2023-53354
Vulnerability from fkie_nvd
Published
2025-09-17 15:15
Modified
2025-09-18 13:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: skbuff: skb_segment, Call zero copy functions before using skbuff frags Commit bf5c25d60861 ("skbuff: in skb_segment, call zerocopy functions once per nskb") added the call to zero copy functions in skb_segment(). The change introduced a bug in skb_segment() because skb_orphan_frags() may possibly change the number of fragments or allocate new fragments altogether leaving nrfrags and frag to point to the old values. This can cause a panic with stacktrace like the one below. [ 193.894380] BUG: kernel NULL pointer dereference, address: 00000000000000bc [ 193.895273] CPU: 13 PID: 18164 Comm: vh-net-17428 Kdump: loaded Tainted: G O 5.15.123+ #26 [ 193.903919] RIP: 0010:skb_segment+0xb0e/0x12f0 [ 194.021892] Call Trace: [ 194.027422] <TASK> [ 194.072861] tcp_gso_segment+0x107/0x540 [ 194.082031] inet_gso_segment+0x15c/0x3d0 [ 194.090783] skb_mac_gso_segment+0x9f/0x110 [ 194.095016] __skb_gso_segment+0xc1/0x190 [ 194.103131] netem_enqueue+0x290/0xb10 [sch_netem] [ 194.107071] dev_qdisc_enqueue+0x16/0x70 [ 194.110884] __dev_queue_xmit+0x63b/0xb30 [ 194.121670] bond_start_xmit+0x159/0x380 [bonding] [ 194.128506] dev_hard_start_xmit+0xc3/0x1e0 [ 194.131787] __dev_queue_xmit+0x8a0/0xb30 [ 194.138225] macvlan_start_xmit+0x4f/0x100 [macvlan] [ 194.141477] dev_hard_start_xmit+0xc3/0x1e0 [ 194.144622] sch_direct_xmit+0xe3/0x280 [ 194.147748] __dev_queue_xmit+0x54a/0xb30 [ 194.154131] tap_get_user+0x2a8/0x9c0 [tap] [ 194.157358] tap_sendmsg+0x52/0x8e0 [tap] [ 194.167049] handle_tx_zerocopy+0x14e/0x4c0 [vhost_net] [ 194.173631] handle_tx+0xcd/0xe0 [vhost_net] [ 194.176959] vhost_worker+0x76/0xb0 [vhost] [ 194.183667] kthread+0x118/0x140 [ 194.190358] ret_from_fork+0x1f/0x30 [ 194.193670] </TASK> In this case calling skb_orphan_frags() updated nr_frags leaving nrfrags local variable in skb_segment() stale. This resulted in the code hitting i >= nrfrags prematurely and trying to move to next frag_skb using list_skb pointer, which was NULL, and caused kernel panic. Move the call to zero copy functions before using frags and nr_frags.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04c3eee4e13f60bf6f9a366ad39f88a01a57166e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ea35288c83b3d501a88bc17f2df8f176b5cc96f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c26ed3c6abe86ddab0510529000b970b05c9b40
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8836c266201c29a5acb4f582227686f47b65ad61
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d44403ec0676317b7f7edf2a035bb219fee3304e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d5790386595d06ea9decfd9ba5f1ea48cf09aa02
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f99006e840a4dbc8f5a34cecc6b5b26c73ef49bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcab3f661dbfd88e27ddbbe65368f3fa2d823175
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nskbuff: skb_segment, Call zero copy functions before using skbuff frags\n\nCommit bf5c25d60861 (\"skbuff: in skb_segment, call zerocopy functions\nonce per nskb\") added the call to zero copy functions in skb_segment().\nThe change introduced a bug in skb_segment() because skb_orphan_frags()\nmay possibly change the number of fragments or allocate new fragments\naltogether leaving nrfrags and frag to point to the old values. This can\ncause a panic with stacktrace like the one below.\n\n[  193.894380] BUG: kernel NULL pointer dereference, address: 00000000000000bc\n[  193.895273] CPU: 13 PID: 18164 Comm: vh-net-17428 Kdump: loaded Tainted: G           O      5.15.123+ #26\n[  193.903919] RIP: 0010:skb_segment+0xb0e/0x12f0\n[  194.021892] Call Trace:\n[  194.027422]  \u003cTASK\u003e\n[  194.072861]  tcp_gso_segment+0x107/0x540\n[  194.082031]  inet_gso_segment+0x15c/0x3d0\n[  194.090783]  skb_mac_gso_segment+0x9f/0x110\n[  194.095016]  __skb_gso_segment+0xc1/0x190\n[  194.103131]  netem_enqueue+0x290/0xb10 [sch_netem]\n[  194.107071]  dev_qdisc_enqueue+0x16/0x70\n[  194.110884]  __dev_queue_xmit+0x63b/0xb30\n[  194.121670]  bond_start_xmit+0x159/0x380 [bonding]\n[  194.128506]  dev_hard_start_xmit+0xc3/0x1e0\n[  194.131787]  __dev_queue_xmit+0x8a0/0xb30\n[  194.138225]  macvlan_start_xmit+0x4f/0x100 [macvlan]\n[  194.141477]  dev_hard_start_xmit+0xc3/0x1e0\n[  194.144622]  sch_direct_xmit+0xe3/0x280\n[  194.147748]  __dev_queue_xmit+0x54a/0xb30\n[  194.154131]  tap_get_user+0x2a8/0x9c0 [tap]\n[  194.157358]  tap_sendmsg+0x52/0x8e0 [tap]\n[  194.167049]  handle_tx_zerocopy+0x14e/0x4c0 [vhost_net]\n[  194.173631]  handle_tx+0xcd/0xe0 [vhost_net]\n[  194.176959]  vhost_worker+0x76/0xb0 [vhost]\n[  194.183667]  kthread+0x118/0x140\n[  194.190358]  ret_from_fork+0x1f/0x30\n[  194.193670]  \u003c/TASK\u003e\n\nIn this case calling skb_orphan_frags() updated nr_frags leaving nrfrags\nlocal variable in skb_segment() stale. This resulted in the code hitting\ni \u003e= nrfrags prematurely and trying to move to next frag_skb using\nlist_skb pointer, which was NULL, and caused kernel panic. Move the call\nto zero copy functions before using frags and nr_frags."
    }
  ],
  "id": "CVE-2023-53354",
  "lastModified": "2025-09-18T13:43:34.310",
  "metrics": {},
  "published": "2025-09-17T15:15:39.403",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/04c3eee4e13f60bf6f9a366ad39f88a01a57166e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ea35288c83b3d501a88bc17f2df8f176b5cc96f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6c26ed3c6abe86ddab0510529000b970b05c9b40"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8836c266201c29a5acb4f582227686f47b65ad61"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d44403ec0676317b7f7edf2a035bb219fee3304e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d5790386595d06ea9decfd9ba5f1ea48cf09aa02"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f99006e840a4dbc8f5a34cecc6b5b26c73ef49bb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fcab3f661dbfd88e27ddbbe65368f3fa2d823175"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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