CVE-2026-90063

Not scored yetLast modified Oct 19, 2026

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.

Metrics

No CVSS score has been published yet.

Affected software

Source: the vendor's advisory (CNA). 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
Sep 17, 2026
Last modified
Oct 19, 2026
NVD status
Received

Related CVEs from 2026

CVE-2026-90064In the Linux kernel, the following vulnerability has been resolved: drm/xe: Reject page faults from non-fault-mode scratch VMs Having scraCVE-2026-90065In the Linux kernel, the following vulnerability has been resolved: net/smc: release the internal TCP sock on IPPROTO_SMC socket creation fCVE-2026-90066In the Linux kernel, the following vulnerability has been resolved: samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-moCVE-2026-900677.5In the Linux kernel, the following vulnerability has been resolved: libceph: validate banner payload length When parsing the Ceph messengeCVE-2026-90068In the Linux kernel, the following vulnerability has been resolved: ASoC: dapm: Fix off-by-one check on the second enum channel The snd_soCVE-2026-900697.8In the Linux kernel, the following vulnerability has been resolved: crypto: acomp - allocate async request context when cloning ACOMP_REQUCVE-2026-90075.5Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in HCL Notes from HCL Software allows refCVE-2026-90070In the Linux kernel, the following vulnerability has been resolved: tpm: st33zp24: Return zero on status read failure st33zp24_status() igCVE-2026-900717.8In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_teql: restore skb->dev on the slave failure path teql_mCVE-2026-90072In the Linux kernel, the following vulnerability has been resolved: net/sched: sfq: clamp quantum to avoid signed overflow soft lockup sfqCVE-2026-90073In the Linux kernel, the following vulnerability has been resolved: net/sched: hhf: clamp quantum before hhf_change() to avoid overflow hhCVE-2026-90074In the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: clamp default quantum to avoid signed overflow fq_p
CVE-2026-90063: Unscored | Vulnix