---
id: CVE-2026-80977
title: >-
  kernel: net: skbuff: don't touch shared zerocopy state in skb_tx_error()
  (CVE-2026-80977)
summary: >-
  A flaw was found in the Linux kernel's networking subsystem. The
  `skb_tx_error()` function improperly handles shared zerocopy state in socket
  buffers (skbs). When a cloned skb is processed, it can prematurely signal that
  its pages are free…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-821
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T18:58:21+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80977.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80977.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80977'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532197'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80977'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80977'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80977.mbox
  - url: 'https://git.kernel.org/stable/c/6493165034bca14033bf49c9cec7b45e97a91497'
  - url: 'https://git.kernel.org/stable/c/b4452349dcf4d561e13be768d5d278de58248930'
  - url: 'https://git.kernel.org/stable/c/363c4252ffc473a0203e91b83ede5519dfb8bd07'
  - url: 'https://git.kernel.org/stable/c/6ec22afc82a3cae07ade0a6ec361ae2532128ff5'
  - url: 'https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb'
  - url: 'https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0'
  - url: 'https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9'
  - url: 'https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00129
epssPercentile: 0.02902
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.455Z'
---

## Overview

A flaw was found in the Linux kernel's networking subsystem. The `skb_tx_error()` function improperly handles shared zerocopy state in socket buffers (skbs). When a cloned skb is processed, it can prematurely signal that its pages are free and drop shared fragment flags while the original skb is still in use. This can lead to a scenario where a local ESP (Encapsulating Security Payload) delivery decrypts data into memory fragments that it does not privately own, potentially resulting in information disclosure.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80977.json)

**kernel: net: skbuff: don't touch shared zerocopy state in skb_tx_error()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope