CVE-2025-39770
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM When performing Generic Segmentation Offload (GSO) on an IPv6 packet that contains extension headers, the kernel incorrectly requests checksum offload if the egress device only advertises NETIF_F_IPV6_CSUM feature, which has a strict contract: it supports checksum offload only for plain TCP or UDP over IPv6 and explicitly does not support packets with extension headers. The current GSO logic violates this contract by failing to disable the feature for packets with extension headers, such as those used in GREoIPv6 tunnels. This violation results in the device being asked to perform an operation it cannot support, leading to a `skb_warn_bad_offload` warning and a collapse of network throughput. While device TSO/USO is correctly bypassed in favor of software GSO for these packets, the GSO stack must be explicitly told not to request checksum offload. Mask NETIF_F_IPV6_CSUM, NETIF_F_TSO6 and NETIF_F_GSO_UDP_L4 in gso_features_check if the IPv6 header contains extension headers to compute checksum in software. The exception is a BIG TCP extension, which, as stated in commit 68e068cabd2c6c53 ("net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets"): "The feature is only enabled on devices that support BIG TCP TSO. The header is only present for PF_PACKET taps like tcpdump, and not transmitted by physical devices." kernel log output (truncated): WARNING: CPU: 1 PID: 5273 at net/core/dev.c:3535 skb_warn_bad_offload+0x81/0x140 ... Call Trace: <TASK> skb_checksum_help+0x12a/0x1f0 validate_xmit_skb+0x1a3/0x2d0 validate_xmit_skb_list+0x4f/0x80 sch_direct_xmit+0x1a2/0x380 __dev_xmit_skb+0x242/0x670 __dev_queue_xmit+0x3fc/0x7f0 ip6_finish_output2+0x25e/0x5d0 ip6_finish_output+0x1fc/0x3f0 ip6_tnl_xmit+0x608/0xc00 [ip6_tunnel] ip6gre_tunnel_xmit+0x1c0/0x390 [ip6_gre] dev_hard_start_xmit+0x63/0x1c0 __dev_queue_xmit+0x6d0/0x7f0 ip6_finish_output2+0x214/0x5d0 ip6_finish_output+0x1fc/0x3f0 ip6_xmit+0x2ca/0x6f0 ip6_finish_output+0x1fc/0x3f0 ip6_xmit+0x2ca/0x6f0 inet6_csk_xmit+0xeb/0x150 __tcp_transmit_skb+0x555/0xa80 tcp_write_xmit+0x32a/0xe90 tcp_sendmsg_locked+0x437/0x1110 tcp_sendmsg+0x2f/0x50 ... skb linear: 00000000: e4 3d 1a 7d ec 30 e4 3d 1a 7e 5d 90 86 dd 60 0e skb linear: 00000010: 00 0a 1b 34 3c 40 20 11 00 00 00 00 00 00 00 00 skb linear: 00000020: 00 00 00 00 00 12 20 11 00 00 00 00 00 00 00 00 skb linear: 00000030: 00 00 00 00 00 11 2f 00 04 01 04 01 01 00 00 00 skb linear: 00000040: 86 dd 60 0e 00 0a 1b 00 06 40 20 23 00 00 00 00 skb linear: 00000050: 00 00 00 00 00 00 00 00 00 12 20 23 00 00 00 00 skb linear: 00000060: 00 00 00 00 00 00 00 00 00 11 bf 96 14 51 13 f9 skb linear: 00000070: ae 27 a0 a8 2b e3 80 18 00 40 5b 6f 00 00 01 01 skb linear: 00000080: 08 0a 42 d4 50 d5 4b 70 f8 1a
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-11 17:15:42.530000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-39770",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-11T17:15:42.530",
"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: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM\n\nWhen performing Generic Segmentation Offload (GSO) on an IPv6 packet that\ncontains extension headers, the kernel incorrectly requests checksum offload\nif the egress device only advertises NETIF_F_IPV6_CSUM feature, which has\na strict contract: it supports checksum offload only for plain TCP or UDP\nover IPv6 and explicitly does not support packets with extension headers.\nThe current GSO logic violates this contract by failing to disable the feature\nfor packets with extension headers, such as those used in GREoIPv6 tunnels.\n\nThis violation results in the device being asked to perform an operation\nit cannot support, leading to a `skb_warn_bad_offload` warning and a collapse\nof network throughput. While device TSO/USO is correctly bypassed in favor\nof software GSO for these packets, the GSO stack must be explicitly told not\nto request checksum offload.\n\nMask NETIF_F_IPV6_CSUM, NETIF_F_TSO6 and NETIF_F_GSO_UDP_L4\nin gso_features_check if the IPv6 header contains extension headers to compute\nchecksum in software.\n\nThe exception is a BIG TCP extension, which, as stated in commit\n68e068cabd2c6c53 (\"net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets\"):\n\"The feature is only enabled on devices that support BIG TCP TSO.\nThe header is only present for PF_PACKET taps like tcpdump,\nand not transmitted by physical devices.\"\n\nkernel log output (truncated):\nWARNING: CPU: 1 PID: 5273 at net/core/dev.c:3535 skb_warn_bad_offload+0x81/0x140\n...\nCall Trace:\n <TASK>\n skb_checksum_help+0x12a/0x1f0\n validate_xmit_skb+0x1a3/0x2d0\n validate_xmit_skb_list+0x4f/0x80\n sch_direct_xmit+0x1a2/0x380\n __dev_xmit_skb+0x242/0x670\n __dev_queue_xmit+0x3fc/0x7f0\n ip6_finish_output2+0x25e/0x5d0\n ip6_finish_output+0x1fc/0x3f0\n ip6_tnl_xmit+0x608/0xc00 [ip6_tunnel]\n ip6gre_tunnel_xmit+0x1c0/0x390 [ip6_gre]\n dev_hard_start_xmit+0x63/0x1c0\n __dev_queue_xmit+0x6d0/0x7f0\n ip6_finish_output2+0x214/0x5d0\n ip6_finish_output+0x1fc/0x3f0\n ip6_xmit+0x2ca/0x6f0\n ip6_finish_output+0x1fc/0x3f0\n ip6_xmit+0x2ca/0x6f0\n inet6_csk_xmit+0xeb/0x150\n __tcp_transmit_skb+0x555/0xa80\n tcp_write_xmit+0x32a/0xe90\n tcp_sendmsg_locked+0x437/0x1110\n tcp_sendmsg+0x2f/0x50\n...\nskb linear: 00000000: e4 3d 1a 7d ec 30 e4 3d 1a 7e 5d 90 86 dd 60 0e\nskb linear: 00000010: 00 0a 1b 34 3c 40 20 11 00 00 00 00 00 00 00 00\nskb linear: 00000020: 00 00 00 00 00 12 20 11 00 00 00 00 00 00 00 00\nskb linear: 00000030: 00 00 00 00 00 11 2f 00 04 01 04 01 01 00 00 00\nskb linear: 00000040: 86 dd 60 0e 00 0a 1b 00 06 40 20 23 00 00 00 00\nskb linear: 00000050: 00 00 00 00 00 00 00 00 00 12 20 23 00 00 00 00\nskb linear: 00000060: 00 00 00 00 00 00 00 00 00 11 bf 96 14 51 13 f9\nskb linear: 00000070: ae 27 a0 a8 2b e3 80 18 00 40 5b 6f 00 00 01 01\nskb linear: 00000080: 08 0a 42 d4 50 d5 4b 70 f8 1a"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: gso: Prohibir TSO IPv6 con extensiones en dispositivos con solo IPV6_CSUM\n\nAl realizar la Descarga de Segmentación Genérica (GSO) en un paquete IPv6 que contiene encabezados de extensión, el kernel solicita incorrectamente la descarga de suma de verificación si el dispositivo de salida solo anuncia la característica NETIF_F_IPV6_CSUM, la cual tiene un contrato estricto: soporta la descarga de suma de verificación solo para TCP o UDP simple sobre IPv6 y explícitamente no soporta paquetes con encabezados de extensión. La lógica GSO actual viola este contrato al no deshabilitar la característica para paquetes con encabezados de extensión, como los utilizados en túneles GREoIPv6.\n\nEsta violación resulta en que se le pide al dispositivo que realice una operación que no puede soportar, lo que lleva a una advertencia 'skb_warn_bad_offload' y a un colapso del rendimiento de la red. Si bien el TSO/USO del dispositivo se omite correctamente a favor del GSO por software para estos paquetes, a la pila GSO se le debe indicar explícitamente que no solicite la descarga de suma de verificación.\n\nEnmascarar NETIF_F_IPV6_CSUM, NETIF_F_TSO6 y NETIF_F_GSO_UDP_L4 en gso_features_check si el encabezado IPv6 contiene encabezados de extensión para calcular la suma de verificación por software.\n\nLa excepción es una extensión BIG TCP, la cual, como se indica en el commit 68e068cabd2c6c53 ('net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets'):\n'La característica solo está habilitada en dispositivos que soportan BIG TCP TSO. El encabezado solo está presente para taps PF_PACKET como tcpdump, y no es transmitido por dispositivos físicos.'\n\nsalida del registro del kernel (truncado):\nADVERTENCIA: CPU: 1 PID: 5273 en net/core/dev.c:3535 skb_warn_bad_offload+0x81/0x140\n...\nRastreo de Llamadas:\n <TAREA>\n skb_checksum_help+0x12a/0x1f0\n validate_xmit_skb+0x1a3/0x2d0\n validate_xmit_skb_list+0x4f/0x80\n sch_direct_xmit+0x1a2/0x380\n __dev_xmit_skb+0x242/0x670\n __dev_queue_xmit+0x3fc/0x7f0\n ip6_finish_output2+0x25e/0x5d0\n ip6_finish_output+0x1fc/0x3f0\n ip6_tnl_xmit+0x608/0xc00 [ip6_tunnel]\n ip6gre_tunnel_xmit+0x1c0/0x390 [ip6_gre]\n dev_hard_start_xmit+0x63/0x1c0\n __dev_queue_xmit+0x6d0/0x7f0\n ip6_finish_output2+0x214/0x5d0\n ip6_finish_output+0x1fc/0x3f0\n ip6_xmit+0x2ca/0x6f0\n ip6_finish_output+0x1fc/0x3f0\n ip6_xmit+0x2ca/0x6f0\n inet6_csk_xmit+0xeb/0x150\n __tcp_transmit_skb+0x555/0xa80\n tcp_write_xmit+0x32a/0xe90\n tcp_sendmsg_locked+0x437/0x1110\n tcp_sendmsg+0x2f/0x50\n...\nskb linear: 00000000: e4 3d 1a 7d ec 30 e4 3d 1a 7e 5d 90 86 dd 60 0e\nskb linear: 00000010: 00 0a 1b 34 3c 40 20 11 00 00 00 00 00 00 00 00\nskb linear: 00000020: 00 00 00 00 00 12 20 11 00 00 00 00 00 00 00 00\nskb linear: 00000030: 00 00 00 00 00 11 2f 00 04 01 04 01 01 00 00 00\nskb linear: 00000040: 86 dd 60 0e 00 0a 1b 00 06 40 20 23 00 00 00 00\nskb linear: 00000050: 00 00 00 00 00 00 00 00 00 12 20 23 00 00 00 00\nskb linear: 00000060: 00 00 00 00 00 00 00 00 00 11 bf 96 14 51 13 f9\nskb linear: 00000070: ae 27 a0 a8 2b e3 80 18 00 40 5b 6f 00 00 01 01\nskb linear: 00000080: 08 0a 42 d4 50 d5 4b 70 f8 1a"
}
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{
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{
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{
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{
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"metrics": {
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"type": "Secondary",
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"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
},
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"configurations": [
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