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CVE-2025-39703

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: net, hsr: reject HSR frame if skb can't hold tag Receiving HSR frame with insufficient space to hold HSR tag in the skb can result in a crash (kernel BUG): [ 45.390915] skbuff: skb_under_panic: text:ffffffff86f32cac len:26 put:14 head:ffff888042418000 data:ffff888042417ff4 tail:0xe end:0x180 dev:bridge_slave_1 [ 45.392559] ------------[ cut here ]------------ [ 45.392912] kernel BUG at net/core/skbuff.c:211! [ 45.393276] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 45.393809] CPU: 1 UID: 0 PID: 2496 Comm: reproducer Not tainted 6.15.0 #12 PREEMPT(undef) [ 45.394433] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 45.395273] RIP: 0010:skb_panic+0x15b/0x1d0 <snip registers, remove unreliable trace> [ 45.402911] Call Trace: [ 45.403105] <IRQ> [ 45.404470] skb_push+0xcd/0xf0 [ 45.404726] br_dev_queue_push_xmit+0x7c/0x6c0 [ 45.406513] br_forward_finish+0x128/0x260 [ 45.408483] __br_forward+0x42d/0x590 [ 45.409464] maybe_deliver+0x2eb/0x420 [ 45.409763] br_flood+0x174/0x4a0 [ 45.410030] br_handle_frame_finish+0xc7c/0x1bc0 [ 45.411618] br_handle_frame+0xac3/0x1230 [ 45.413674] __netif_receive_skb_core.constprop.0+0x808/0x3df0 [ 45.422966] __netif_receive_skb_one_core+0xb4/0x1f0 [ 45.424478] __netif_receive_skb+0x22/0x170 [ 45.424806] process_backlog+0x242/0x6d0 [ 45.425116] __napi_poll+0xbb/0x630 [ 45.425394] net_rx_action+0x4d1/0xcc0 [ 45.427613] handle_softirqs+0x1a4/0x580 [ 45.427926] do_softirq+0x74/0x90 [ 45.428196] </IRQ> This issue was found by syzkaller. The panic happens in br_dev_queue_push_xmit() once it receives a corrupted skb with ETH header already pushed in linear data. When it attempts the skb_push() call, there's not enough headroom and skb_push() panics. The corrupted skb is put on the queue by HSR layer, which makes a sequence of unintended transformations when it receives a specific corrupted HSR frame (with incomplete TAG). Fix it by dropping and consuming frames that are not long enough to contain both ethernet and hsr headers. Alternative fix would be to check for enough headroom before skb_push() in br_dev_queue_push_xmit(). In the reproducer, this is injected via AF_PACKET, but I don't easily see why it couldn't be sent over the wire from adjacent network. Further Details: In the reproducer, the following network interface chain is set up: ┌────────────────┐ ┌────────────────┐ │ veth0_to_hsr ├───┤ hsr_slave0 ┼───┐ └────────────────┘ └────────────────┘ │ │ ┌──────┐ ├─┤ hsr0 ├───┐ │ └──────┘ │ ┌────────────────┐ ┌────────────────┐ │ │┌────────┐ │ veth1_to_hsr ┼───┤ hsr_slave1 ├───┘ └┤ │ └────────────────┘ └────────────────┘ ┌┼ bridge │ ││ │ │└────────┘ │ ┌───────┐ │ │ ... ├──────┘ └───────┘ To trigger the events leading up to crash, reproducer sends a corrupted HSR fr ---truncated---

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-05 18:15:47.417000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
  "id": "CVE-2025-39703",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-05T18:15:47.417",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, hsr: reject HSR frame if skb can't hold tag\n\nReceiving HSR frame with insufficient space to hold HSR tag in the skb\ncan result in a crash (kernel BUG):\n\n[   45.390915] skbuff: skb_under_panic: text:ffffffff86f32cac len:26 put:14 head:ffff888042418000 data:ffff888042417ff4 tail:0xe end:0x180 dev:bridge_slave_1\n[   45.392559] ------------[ cut here ]------------\n[   45.392912] kernel BUG at net/core/skbuff.c:211!\n[   45.393276] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n[   45.393809] CPU: 1 UID: 0 PID: 2496 Comm: reproducer Not tainted 6.15.0 #12 PREEMPT(undef)\n[   45.394433] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[   45.395273] RIP: 0010:skb_panic+0x15b/0x1d0\n\n<snip registers, remove unreliable trace>\n\n[   45.402911] Call Trace:\n[   45.403105]  <IRQ>\n[   45.404470]  skb_push+0xcd/0xf0\n[   45.404726]  br_dev_queue_push_xmit+0x7c/0x6c0\n[   45.406513]  br_forward_finish+0x128/0x260\n[   45.408483]  __br_forward+0x42d/0x590\n[   45.409464]  maybe_deliver+0x2eb/0x420\n[   45.409763]  br_flood+0x174/0x4a0\n[   45.410030]  br_handle_frame_finish+0xc7c/0x1bc0\n[   45.411618]  br_handle_frame+0xac3/0x1230\n[   45.413674]  __netif_receive_skb_core.constprop.0+0x808/0x3df0\n[   45.422966]  __netif_receive_skb_one_core+0xb4/0x1f0\n[   45.424478]  __netif_receive_skb+0x22/0x170\n[   45.424806]  process_backlog+0x242/0x6d0\n[   45.425116]  __napi_poll+0xbb/0x630\n[   45.425394]  net_rx_action+0x4d1/0xcc0\n[   45.427613]  handle_softirqs+0x1a4/0x580\n[   45.427926]  do_softirq+0x74/0x90\n[   45.428196]  </IRQ>\n\nThis issue was found by syzkaller.\n\nThe panic happens in br_dev_queue_push_xmit() once it receives a\ncorrupted skb with ETH header already pushed in linear data. When it\nattempts the skb_push() call, there's not enough headroom and\nskb_push() panics.\n\nThe corrupted skb is put on the queue by HSR layer, which makes a\nsequence of unintended transformations when it receives a specific\ncorrupted HSR frame (with incomplete TAG).\n\nFix it by dropping and consuming frames that are not long enough to\ncontain both ethernet and hsr headers.\n\nAlternative fix would be to check for enough headroom before skb_push()\nin br_dev_queue_push_xmit().\n\nIn the reproducer, this is injected via AF_PACKET, but I don't easily\nsee why it couldn't be sent over the wire from adjacent network.\n\nFurther Details:\n\nIn the reproducer, the following network interface chain is set up:\n\n┌────────────────┐   ┌────────────────┐\n│ veth0_to_hsr   ├───┤  hsr_slave0    ┼───┐\n└────────────────┘   └────────────────┘   │\n                                          │ ┌──────┐\n                                          ├─┤ hsr0 ├───┐\n                                          │ └──────┘   │\n┌────────────────┐   ┌────────────────┐   │            │┌────────┐\n│ veth1_to_hsr   ┼───┤  hsr_slave1    ├───┘            └┤        │\n└────────────────┘   └────────────────┘                ┌┼ bridge │\n                                                       ││        │\n                                                       │└────────┘\n                                                       │\n                                        ┌───────┐      │\n                                        │  ...  ├──────┘\n                                        └───────┘\n\nTo trigger the events leading up to crash, reproducer sends a corrupted\nHSR fr\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet, hsr: rechazar trama HSR si skb no puede contener la etiqueta\n\nRecibir una trama HSR con espacio insuficiente para contener la etiqueta HSR en el skb puede resultar en un fallo (BUG del kernel):\n\n[   45.390915] skbuff: skb_under_panic: text:ffffffff86f32cac len:26 put:14 head:ffff888042418000 data:ffff888042417ff4 tail:0xe end:0x180 dev:bridge_slave_1\n[   45.392559] ------------[ cut here ]------------\n[   45.392912] kernel BUG at net/core/skbuff.c:211!\n[   45.393276] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n[   45.393809] CPU: 1 UID: 0 PID: 2496 Comm: reproducer Not tainted 6.15.0 #12 PREEMPT(undef)\n[   45.394433] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[   45.395273] RIP: 0010:skb_panic+0x15b/0x1d0\n\n<se omiten registros, se elimina traza no fiable>\n\n[   45.402911] Traza de Llamada:\n[   45.403105]  <IRQ>\n[   45.404470]  skb_push+0xcd/0xf0\n[   45.404726]  br_dev_queue_push_xmit+0x7c/0x6c0\n[   45.406513]  br_forward_finish+0x128/0x260\n[   45.408483]  __br_forward+0x42d/0x590\n[   45.409464]  maybe_deliver+0x2eb/0x420\n[   45.409763]  br_flood+0x174/0x4a0\n[   45.410030]  br_handle_frame_finish+0xc7c/0x1bc0\n[   45.411618]  br_handle_frame+0xac3/0x1230\n[   45.413674]  __netif_receive_skb_core.constprop.0+0x808/0x3df0\n[   45.422966]  __netif_receive_skb_one_core+0xb4/0x1f0\n[   45.424478]  __netif_receive_skb+0x22/0x170\n[   45.424806]  process_backlog+0x242/0x6d0\n[   45.425116]  __napi_poll+0xbb/0x630\n[   45.425394]  net_rx_action+0x4d1/0xcc0\n[   45.427613]  handle_softirqs+0x1a4/0x580\n[   45.427926]  do_softirq+0x74/0x90\n[   45.428196]  </IRQ>\n\nEste problema fue encontrado por syzkaller.\n\nEl pánico ocurre en br_dev_queue_push_xmit() una vez que recibe un skb corrupto con la cabecera ETH ya insertada en los datos lineales. Cuando intenta la llamada a skb_push(), no hay suficiente espacio de cabecera y skb_push() entra en pánico.\n\nEl skb corrupto es puesto en la cola por la capa HSR, lo que realiza una secuencia de transformaciones no intencionadas cuando recibe una trama HSR corrupta específica (con TAG incompleto).\n\nSolucionarlo descartando y consumiendo las tramas que no son lo suficientemente largas para contener ambas cabeceras ethernet y hsr.\n\nUna solución alternativa sería verificar si hay suficiente espacio de cabecera antes de skb_push() en br_dev_queue_push_xmit().\n\nEn el reproductor, esto se inyecta a través de AF_PACKET, pero no veo fácilmente por qué no podría ser enviado por la red desde una red adyacente.\n\nMás detalles:\n\nEn el reproductor, la siguiente cadena de interfaz de red está configurada:\n\n??????????????????   ??????????????????\n? veth0_to_hsr   ?????  hsr_slave0    ?????\n??????????????????   ??????????????????   ?\n                                          ? ????????\n                                          ??? hsr0 ?????\n                                          ? ????????   ?\n??????????????????   ??????????????????   ?            ???????????\n? veth1_to_hsr   ?????  hsr_slave1    ?????            ??        ?\n??????????????????   ??????????????????                ?? bridge ?\n                                                       ??        ?\n                                                       ???????????\n                                                       ?\n                                        ?????????      ?\n                                        ?  ...  ????????\n                                        ?????????\n\nPara desencadenar los eventos que conducen al fallo, el reproductor envía una trama HSR corrupta\n---truncado---"
    }
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