CVE-2025-39703 (GCVE-0-2025-39703)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-10-15 22:02
VLAI
Title
net, hsr: reject HSR frame if skb can't hold tag
Summary
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
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:53 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f6442ee08fe66c8e45c4f246531a2aaf4f17a7a7 , < 8d9bc4a375a1ba05f7dfa0407de8e510ab9bd14d (git)
Affected: 48b491a5cc74333c4a6a82fe21cea42c055a3b0b , < 3ae272ab523dd6bdc26e879027ed79feac9dd1b3 (git)
Affected: 48b491a5cc74333c4a6a82fe21cea42c055a3b0b , < b640188b8a6690e685939053c7efdbc7818b5f4e (git)
Affected: 48b491a5cc74333c4a6a82fe21cea42c055a3b0b , < b117c41b00902c1a7e24347c405cb82504aeae0b (git)
Affected: 48b491a5cc74333c4a6a82fe21cea42c055a3b0b , < acd69b597bd3f76d3b3d322b84082226c00eeaa4 (git)
Affected: 48b491a5cc74333c4a6a82fe21cea42c055a3b0b , < 61009439e4bd8d74e705ee15940760321be91d8a (git)
Affected: 48b491a5cc74333c4a6a82fe21cea42c055a3b0b , < 7af76e9d18a9fd6f8611b3313c86c190f9b6a5a7 (git)
Affected: 4ffd1d4a6b306ff69cbe412d2c54d2dd349ff436 (git)
Affected: 5.10.42 , < 5.10.241 (semver)
Affected: 5.12.9 , < 5.13 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, hsr: reject HSR frame if skb can\u0027t 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\u003csnip registers, remove unreliable trace\u003e\n\n[   45.402911] Call Trace:\n[   45.403105]  \u003cIRQ\u003e\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]  \u003c/IRQ\u003e\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\u0027s 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\u0027t easily\nsee why it couldn\u0027t 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\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 veth0_to_hsr   \u251c\u2500\u2500\u2500\u2524  hsr_slave0    \u253c\u2500\u2500\u2500\u2510\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n                                          \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n                                          \u251c\u2500\u2524 hsr0 \u251c\u2500\u2500\u2500\u2510\n                                          \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502            \u2502\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 veth1_to_hsr   \u253c\u2500\u2500\u2500\u2524  hsr_slave1    \u251c\u2500\u2500\u2500\u2518            \u2514\u2524        \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                \u250c\u253c bridge \u2502\n                                                       \u2502\u2502        \u2502\n                                                       \u2502\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                                       \u2502\n                                        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502\n                                        \u2502  ...  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                        \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\nTo trigger the events leading up to crash, reproducer sends a corrupted\nHSR fr\n---truncated---"
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              "lang": "en",
              "value": "AV:N - The bug is triggered purely by a received HSR/PRP-tagged frame processed by the HSR rx_handler in net/hsr/, with no local access required. HSR slaves are commonly veth/tap/bridge/tunnel-backed in virtualized and industrial-gateway deployments, where an undersized inner Ethernet frame delivered through a routed L2-over-IP tunnel (VXLAN/GRE) reaches the handler from an arbitrary remote host.\nAC:L - The attacker only needs to send a single HSR/PRP frame shorter than ETH_HLEN + HSR_HLEN (20 bytes); the missing length check is hit deterministically on every such frame with no timing, race, or memory-layout precondition.\nPR:N - There is no authentication, capability check, or credential validation anywhere on the path from netif_receive_skb() through hsr_handle_frame() to hsr_forward_skb(); any unauthenticated sender of a frame on the HSR-enslaved link is sufficient.\nUI:N - Frame processing happens automatically in the NAPI/softirq receive path as soon as the frame arrives; no victim action is required.\nS:U - The corruption and its effects stay within the kernel network stack of the same host, with no crossing of a VM, IOMMU, or sandbox security authority.\nC:H - The corrupted mac_len/network_header cause out-of-bounds reads past skb-\u003etail in hsr_get_skb_sequence_nr() and create_stripped_skb_hsr(), and when headroom suffices br_dev_queue_push_xmit()\u0027s skb_push(ETH_HLEN) turns 14 bytes of uninitialized kernel heap into the Ethernet header of a frame that is then transmitted, disclosing kernel memory to the network.\nI:H - Attacker-controlled skb geometry corruption (network_header, mac_len, and len inconsistent with the linear buffer) propagates into the bridge/forwarding path where skb_push moves skb-\u003edata outside the intended data region, corrupting packet contents and providing the memory-corruption primitive that is only accidentally caught by the skb_under_panic BUG().\nA:H - The documented syzbot outcome is skb_under_panic() hitting BUG() at net/core/skbuff.c:211 from softirq/IRQ context, which is a fatal kernel panic, and it can be re-triggered at will with a single crafted frame."
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    "datePublished": "2025-09-05T17:21:09.768Z",
    "dateReserved": "2025-04-16T07:20:57.115Z",
    "dateUpdated": "2026-10-15T22:02:30.781Z",
    "state": "PUBLISHED"
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      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39703.json",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, hsr: reject HSR frame if skb can\u0027t 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\u003csnip registers, remove unreliable trace\u003e\n\n[   45.402911] Call Trace:\n[   45.403105]  \u003cIRQ\u003e\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]  \u003c/IRQ\u003e\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\u0027s 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\u0027t easily\nsee why it couldn\u0027t 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\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 veth0_to_hsr   \u251c\u2500\u2500\u2500\u2524  hsr_slave0    \u253c\u2500\u2500\u2500\u2510\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n                                          \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n                                          \u251c\u2500\u2524 hsr0 \u251c\u2500\u2500\u2500\u2510\n                                          \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502            \u2502\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 veth1_to_hsr   \u253c\u2500\u2500\u2500\u2524  hsr_slave1    \u251c\u2500\u2500\u2500\u2518            \u2514\u2524        \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                \u250c\u253c bridge \u2502\n                                                       \u2502\u2502        \u2502\n                                                       \u2502\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                                       \u2502\n                                        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502\n                                        \u2502  ...  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                        \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\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\u003cse omiten registros, se elimina traza no fiable\u003e\n\n[   45.402911] Traza de Llamada:\n[   45.403105]  \u003cIRQ\u003e\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]  \u003c/IRQ\u003e\n\nEste problema fue encontrado por syzkaller.\n\nEl p\u00e1nico 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 p\u00e1nico.\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 espec\u00edfica (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 soluci\u00f3n alternativa ser\u00eda 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 trav\u00e9s de AF_PACKET, pero no veo f\u00e1cilmente por qu\u00e9 no podr\u00eda ser enviado por la red desde una red adyacente.\n\nM\u00e1s detalles:\n\nEn el reproductor, la siguiente cadena de interfaz de red est\u00e1 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 env\u00eda una trama HSR corrupta\n---truncado---"
          }
        ],
        "id": "CVE-2025-39703",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
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                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, hsr: reject HSR frame if skb can\u0027t 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\u003csnip registers, remove unreliable trace\u003e\n\n[   45.402911] Call Trace:\n[   45.403105]  \u003cIRQ\u003e\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]  \u003c/IRQ\u003e\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\u0027s 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\u0027t easily\nsee why it couldn\u0027t 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\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 veth0_to_hsr   \u251c\u2500\u2500\u2500\u2524  hsr_slave0    \u253c\u2500\u2500\u2500\u2510\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n                                          \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n                                          \u251c\u2500\u2524 hsr0 \u251c\u2500\u2500\u2500\u2510\n                                          \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502            \u2502\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 veth1_to_hsr   \u253c\u2500\u2500\u2500\u2524  hsr_slave1    \u251c\u2500\u2500\u2500\u2518            \u2514\u2524        \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                \u250c\u253c bridge \u2502\n                                                       \u2502\u2502        \u2502\n                                                       \u2502\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                                       \u2502\n                                        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502\n                                        \u2502  ...  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                        \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\nTo trigger the events leading up to crash, reproducer sends a corrupted\nHSR fr\n---truncated---"
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                  "value": "AV:N - The bug is triggered purely by a received HSR/PRP-tagged frame processed by the HSR rx_handler in net/hsr/, with no local access required. HSR slaves are commonly veth/tap/bridge/tunnel-backed in virtualized and industrial-gateway deployments, where an undersized inner Ethernet frame delivered through a routed L2-over-IP tunnel (VXLAN/GRE) reaches the handler from an arbitrary remote host.\nAC:L - The attacker only needs to send a single HSR/PRP frame shorter than ETH_HLEN + HSR_HLEN (20 bytes); the missing length check is hit deterministically on every such frame with no timing, race, or memory-layout precondition.\nPR:N - There is no authentication, capability check, or credential validation anywhere on the path from netif_receive_skb() through hsr_handle_frame() to hsr_forward_skb(); any unauthenticated sender of a frame on the HSR-enslaved link is sufficient.\nUI:N - Frame processing happens automatically in the NAPI/softirq receive path as soon as the frame arrives; no victim action is required.\nS:U - The corruption and its effects stay within the kernel network stack of the same host, with no crossing of a VM, IOMMU, or sandbox security authority.\nC:H - The corrupted mac_len/network_header cause out-of-bounds reads past skb-\u003etail in hsr_get_skb_sequence_nr() and create_stripped_skb_hsr(), and when headroom suffices br_dev_queue_push_xmit()\u0027s skb_push(ETH_HLEN) turns 14 bytes of uninitialized kernel heap into the Ethernet header of a frame that is then transmitted, disclosing kernel memory to the network.\nI:H - Attacker-controlled skb geometry corruption (network_header, mac_len, and len inconsistent with the linear buffer) propagates into the bridge/forwarding path where skb_push moves skb-\u003edata outside the intended data region, corrupting packet contents and providing the memory-corruption primitive that is only accidentally caught by the skb_under_panic BUG().\nA:H - The documented syzbot outcome is skb_under_panic() hitting BUG() at net/core/skbuff.c:211 from softirq/IRQ context, which is a fatal kernel panic, and it can be re-triggered at will with a single crafted frame."
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      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39703",
        "datePublished": "2025-09-05T17:21:09.768Z",
        "dateReserved": "2025-04-16T07:20:57.115Z",
        "dateUpdated": "2026-10-15T22:02:30.781Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.