CVE-2026-90051 Linux Kernel - Denial of Service

Linux kernel contains a vulnerability in tcp_sendmsg_locked where devmem tcp tx is not properly enforced without zero-copy, causing potential data copy errors and invariant breaks, letting attackers cause denial of service, exploit requires crafted io_uring requests with dmabuf_id and zero-copy flags.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the patch enforcing zero-copy devmem tx.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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