HIGH

CVE-2026-43503

CVSS v3

8.8

HIGH

EPSS Score

2.0 %

exploit probability, as of 2026-10-02

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: propagate shared-frag marker through frag-transfer helpers Two frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail to propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()->flags when moving frags from source to destination. __pskb_copy_fclone() defers the rest of the shinfo metadata to skb_copy_header() after copying frag descriptors, but that helper only carries over gso_{size,segs, type} and never

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2026-05-23
Last Modified: 2026-07-23
MSRC Title: net: skbuff: propagate shared-frag marker through frag-transfer helpers

Frequently asked questions

What is CVE-2026-43503?

Is CVE-2026-43503 actively exploited?

Active exploitation of CVE-2026-43503 has not been confirmed. Its EPSS score was 2.0% on 2026-10-02, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-43503?

CVE-2026-43503 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

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