Unscored CVE-2021-47306 EUVD-2021-34311GHSA-j8g9-5p8g-4f3x

net: fddi: fix UAF in fza_probe

Published May 21, 2024 · Updated May 11, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.2 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.2 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.2 Package: linux-hwe-edge Package: linux-ibm Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-kvm Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.2 Package: linux-nvidia-6.2 Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-vmware Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

net: fddi: fix UAF in fza_probe

fp is netdev private data and it cannot be
used after free_netdev() call. Using fp after free_netdev()
can cause UAF bug. Fix it by moving free_netdev() after error message.

TURBOchannel adapter")

Affected products

Vendor	Product	Affected	Fixed
Linux	Linux	4.20	5.4.135

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 14	linux	5.14.6-1	—
Debian 13	linux	5.14.6-1	—
Debian 12	linux	5.14.6-1	—

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu 24.04 LTS	linux-raspi-realtime	No fix yet	—
Ubuntu 22.04 LTS	linux-riscv +22	No fix yet	—
Ubuntu 20.04 LTS	linux	5.4.0-88.99	—
Ubuntu 20.04 LTS	linux-aws	5.4.0-1057.60	—
Ubuntu 20.04 LTS	linux-azure	5.4.0-1059.62	—
Ubuntu 20.04 LTS	linux-bluefield	5.4.0-1019.22	—
Ubuntu 20.04 LTS	linux-gcp	5.4.0-1053.57	—
Ubuntu 20.04 LTS	linux-gke +26	No fix yet	—
Ubuntu 20.04 LTS	linux-gkeop	5.4.0-1024.25	—
Ubuntu 20.04 LTS	linux-ibm	5.4.0-1005.6	—
Ubuntu 20.04 LTS	linux-kvm	5.4.0-1047.49	—
Ubuntu 20.04 LTS	linux-oracle	5.4.0-1055.59	—
Ubuntu 20.04 LTS	linux-raspi	5.4.0-1044.48	—
Ubuntu 18.04 LTS	linux-aws-5.4	5.4.0-1057.60~18.04.1	—
Ubuntu 18.04 LTS	linux-azure-5.4	5.4.0-1059.62~18.04.1	—
Ubuntu 18.04 LTS	linux-gcp +14	No fix yet	—
Ubuntu 18.04 LTS	linux-gcp-5.4	5.4.0-1053.57~18.04.1	—
Ubuntu 18.04 LTS	linux-hwe-5.4	5.4.0-87.98~18.04.1	—
Ubuntu 18.04 LTS	linux-oracle-5.4	5.4.0-1055.59~18.04.1	—
Ubuntu 18.04 LTS	linux-raspi-5.4	5.4.0-1044.48~18.04.1	—
Ubuntu 16.04 LTS	linux-hwe-edge	No fix yet	—

Show 2 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
Ubuntu Pro FIPS 20.04 LTS	linux-fips +3	No fix yet	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-aws-fips	5.4.0-1069.73+fips2	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-azure-fips	5.4.0-1073.76+fips1	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-fips	5.4.0-1034.40	—
Ubuntu Pro FIPS-updates 20.04 LTS	linux-gcp-fips	5.4.0-1067.71~20.04.1	—

References