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CVE-2026-90063

Unknown

Last modified

CVE-2026-90063 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: virtio-net: Ensure that TCP packets don't overflow gso_segs The user can specify any gso_size in a packet crafted with an AF_PACKET PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535.

Description

In the Linux kernel, the following vulnerability has been resolved: virtio-net: Ensure that TCP packets don't overflow gso_segs The user can specify any gso_size in a packet crafted with an AF_PACKET PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user crafts a packet with gso_size < 8, there is a risk for partial GSO to overflow the 16-bit gso_segs field when dividing the SKB length by gso_size. Adjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep gso_size of UDP GSO packets, as gso_size=1 is valid and explicitly tested at tools/testing/selftests/net/tun.c:649.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < d3d111fe809773edbb4ae121e36253b7d683509a; >= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < 8f6667a081887c2b59c6f3dd86c1789ada563762; >= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < 339f47ae04dcc6b5a730dd6bc70dddc8937c3260; >= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < 29bd12c7c5f9d6cf855b87bace18f71e9607f9e8; >= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < 0e5ed3b98d1d8d251acfdccfeaa607453ad12954; >= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < 75c271c48f483af678e514734e10b2452410e08c; >= 7c6d2ecbda83150b2036a2b36b21381ad4667762, < c27c449d455aafd9018a3cbab150f1c42c87923f; bfbaf151efe491e30697e21c8b7ae1b615480873; 6c83456601e65a6dd371ddf595510183d198e9b1; b3ebd9830c6026c98f03f7047c9d608573773f13; b96fb681ca789629b8ba3da99ca3b2e6fa807f0a; >= 4.14.187, < 4.15; >= 4.19.131, < 4.20; >= 5.4.46, < 5.5; >= 5.6.18, < 5.7
LinuxLinux5.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90063?
In the Linux kernel, the following vulnerability has been resolved: virtio-net: Ensure that TCP packets don't overflow gso_segs The user can specify any gso_size in a packet crafted with an AF_PACKET PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user crafts a packet with gso_size < 8, there is a risk for partial GSO to overflow the 16-bit gso_segs field when dividing the SKB length by gso_size. Adjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep gso_size of UDP GSO packets, as gso_size=1 is valid and explicitly tested at tools/testing/selftests/net/tun.c:649.
How severe is CVE-2026-90063?
Severity scoring for CVE-2026-90063 is pending analysis.
How do I fix CVE-2026-90063?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST