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CVE-2026-43036

Updated on 01 May 2026

Severity

5.5 Medium severity

Details

CVSS score
5.5
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

net: use skb_header_pointer() for TCPv4 GSO frag_off check

Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1].

gso_features_check() reads iph->frag_off to decide whether to clear mangleid_features. Accessing the IPv4 header via ip_hdr()/inner_ip_hdr() can rely on skb header offsets that are not always safe for direct dereference on packets injected from PF_PACKET paths.

Use skb_header_pointer() for the TCPv4 frag_off check so the header read is robust whether data is already linear or needs copying.

[1] https://syzkaller.appspot.com/bug?extid=1543a7d954d9c6d00407

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , Debian 10 ELS , Oracle Linux 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
Affected packages:
kernel @ 5.14.0 (+10 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 9.2 ESU Released
24 kernels
  • 5.14.0-284.1101.el9_2.tuxcare.7.els20
  • 5.14.0-284.1101.el9_2.tuxcare.7.els21
  • 5.14.0-284.1101.el9_2.tuxcare.7.els23
  • 5.14.0-284.1101.el9_2.tuxcare.7.els22
  • 5.14.0-284.1101.el9_2.tuxcare.7.els14
  • 5.14.0-284.1101.el9_2.tuxcare.7.els18
  • 5.14.0-284.1101.el9_2.tuxcare.7.els16
  • 5.14.0-284.1101.el9_2.tuxcare.7.els15
  • 5.14.0-284.1101.el9_2.tuxcare.7.els17
  • 5.14.0-284.1101.el9_2.tuxcare.7.els19
  • 5.14.0-284.1101.el9_2.tuxcare.7.els24
  • 5.14.0-284.1101.el9_2.tuxcare.7.els25
  • 5.14.0-284.1101.el9_2.tuxcare.7.els26
  • 5.14.0-284.1101.el9_2.tuxcare.7.els27
  • 5.14.0-284.1101.el9_2.tuxcare.7.els28
  • 5.14.0-284.1101.el9_2.tuxcare.7.els29
  • 5.14.0-284.1101.el9_2.tuxcare.7.els30
  • 5.14.0-284.1101.el9_2.tuxcare.7.els31
  • 5.14.0-284.1101.el9_2.tuxcare.7.els32
  • 5.14.0-284.1101.el9_2.tuxcare.7.els35
  • 5.14.0-284.1101.el9_2.tuxcare.7.els34
  • 5.14.0-284.1101.el9_2.tuxcare.11.els1
  • 5.14.0-284.1101.el9_2.tuxcare.11.els2
  • 5.14.0-284.1101.el9_2.tuxcare.11.els3
AlmaLinux 9.6 ESU Released
9 kernels
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els1
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els2
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els3
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els4
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els5
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els6
  • 5.14.0-570.62.1.el9_6.tuxcare.1.els7
  • 5.14.0-570.62.1.el9_6.tuxcare.5.els1
  • 5.14.0-570.62.1.el9_6.tuxcare.5.els2
Debian 13 Planned —
Ubuntu 24.04 Planned —