High 7.8Published May 6, 2026

CVE-2026-43093xsk: tighten UMEM headroom validation to account for tailroom and min frame

Updated under an hour ago (Oct 27, 2026, 10:23 PM ET)

Does this affect you?

It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() could leave us with insufficient space dedicated to even receive minimum-sized ethernet frame. Furthermore if multi-buffer would come to play then skb_shared_info stored at the end of XSK frame would be corrupted. HW typically works with 128-aligned sizes so let us provide this value as bare minimum. Multi-buffer setting is known later in the configuration process so besides accounting for 128 bytes, let us also take care of tailroom space upfront.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	99e3a236dd43d06c65af0a2ef9cb44306aef6e02 builds before 5f123bc278bf4e3283d8606321bebbfd299f4384; 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 builds before 1a6051cd7e3e4c54ff3854a43b638b9292af5e67; from 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 before 8769708add9eadeea8041a9761771bb715a87104; from 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 before a03975beb9f6af0d8ac051e30b2abeabe618414f; 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 builds before 0ec4d3f6e6934deb843b561ae048cd17218e5ad1; 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 builds before 9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12; from 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 before 6523bc1b40e69301f24c14338b762af4739d6d39; from 99e3a236dd43d06c65af0a2ef9cb44306aef6e02 before a315e022a72d95ef5f1d4e58e903cb492b0ad931; and 6 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.19.118 before 4.20; from 5.4.35 before 5.5; from 5.6.7 before 5.7; from 5.7.1 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; 5.7; and 13 more ranges	NVD

References

References

https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384
https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67
https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104
https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f	patch
https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1	patch
https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12	patch
https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39	patch
https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.