CVE-2026-90063

virtio-net: Ensure that TCP packets don't overflow gso_segs

Published Sep 17, 2026 CVSS n/a EPSS < 1% KEV · Not listed

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 Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< d3d111fe809773edbb4ae121e36253b7d683509a
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< 8f6667a081887c2b59c6f3dd86c1789ada563762
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< 339f47ae04dcc6b5a730dd6bc70dddc8937c3260
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< 29bd12c7c5f9d6cf855b87bace18f71e9607f9e8
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< 0e5ed3b98d1d8d251acfdccfeaa607453ad12954
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< 75c271c48f483af678e514734e10b2452410e08c
`7c6d2ecbda83150b2036a2b36b21381ad4667762`	affected	< c27c449d455aafd9018a3cbab150f1c42c87923f
`bfbaf151efe491e30697e21c8b7ae1b615480873`	affected	—
`6c83456601e65a6dd371ddf595510183d198e9b1`	affected	—
`b3ebd9830c6026c98f03f7047c9d608573773f13`	affected	—
`b96fb681ca789629b8ba3da99ca3b2e6fa807f0a`	affected	—
`4.14.187`	affected	< 4.15
`4.19.131`	affected	< 4.20
`5.4.46`	affected	< 5.5
`5.6.18`	affected	< 5.7

Linux

affected

Version	Status	Constraints
`5.7`	affected	—
`0`	unaffected	< 5.7
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,d3d111fe809773edbb4ae121e36253b7d683509a)`	affected	code_commit	—
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,8f6667a081887c2b59c6f3dd86c1789ada563762)`	affected	code_commit	—
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,339f47ae04dcc6b5a730dd6bc70dddc8937c3260)`	affected	code_commit	—
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,29bd12c7c5f9d6cf855b87bace18f71e9607f9e8)`	affected	code_commit	—
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,0e5ed3b98d1d8d251acfdccfeaa607453ad12954)`	affected	code_commit	—
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,75c271c48f483af678e514734e10b2452410e08c)`	affected	code_commit	—
`[7c6d2ecbda83150b2036a2b36b21381ad4667762,c27c449d455aafd9018a3cbab150f1c42c87923f)`	affected	code_commit	—
`bfbaf151efe491e30697e21c8b7ae1b615480873`	affected	code_commit	—
`6c83456601e65a6dd371ddf595510183d198e9b1`	affected	code_commit	—
`b3ebd9830c6026c98f03f7047c9d608573773f13`	affected	code_commit	—
`b96fb681ca789629b8ba3da99ca3b2e6fa807f0a`	affected	code_commit	—
`[4.14.187,4.15)`	affected	semver	—
`[4.19.131,4.20)`	affected	semver	—
`[5.4.46,5.5)`	affected	semver	—
`[5.6.18,5.7)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`5.7`	affected	semver	—
`[0,5.7)`	unaffected	semver	—
`[5.15.221,5.15.*]`	unaffected	semver	—
`[6.1.188,6.1.*]`	unaffected	semver	—
`[6.6.157,6.6.*]`	unaffected	semver	—
`[6.12.110,6.12.*]`	unaffected	semver	—
`[6.18.52,6.18.*]`	unaffected	semver	—
`[7.2.6,7.2.*]`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.211% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954
https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8
https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260
https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c
https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762
https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f
https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a

History

Sep 20, 2026 5:30 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-680

Sep 17, 2026 4:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
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.
Title		virtio-net: Ensure that TCP packets don't overflow gso_segs
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954 https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8 https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260 https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762 https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a