CVE-2023-53354
Estado: ModificadaMedia (5.5)—
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.
In this case calling skb_orphan_frags() updated nr_frags leaving nrfrags local variable in skb_segment() stale.
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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.
Detalles técnicos trazas, registros y código del informe original
[ 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>
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-476
- CWE-476
Referencias
- https://git.kernel.org/stable/c/04c3eee4e13f60bf6f9a366ad39f88a01a57166e
- https://git.kernel.org/stable/c/2ea35288c83b3d501a88bc17f2df8f176b5cc96f
- https://git.kernel.org/stable/c/6c26ed3c6abe86ddab0510529000b970b05c9b40
- https://git.kernel.org/stable/c/8836c266201c29a5acb4f582227686f47b65ad61
- https://git.kernel.org/stable/c/d44403ec0676317b7f7edf2a035bb219fee3304e
- https://git.kernel.org/stable/c/d5790386595d06ea9decfd9ba5f1ea48cf09aa02
- https://git.kernel.org/stable/c/f99006e840a4dbc8f5a34cecc6b5b26c73ef49bb
- https://git.kernel.org/stable/c/fcab3f661dbfd88e27ddbbe65368f3fa2d823175
JSON original (NVD)
Mostrar
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"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] <TASK>\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] </TASK>\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 >= 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."
}
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"lastModified": "2026-08-04T10:19:03.027",
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