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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47235net: ethernet: fix potential use-after-free in ec_bhf_remove

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.2%top 86.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: fix potential use-after-free in ec_bhf_remove static void ec_bhf_remove(struct pci_dev *dev) { ... struct ec_bhf_priv *priv = netdev_priv(net_dev); unregister_netdev(net_dev); free_netdev(net_dev); pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); ... } priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after pci_iounmap() calls.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-1DEBIAN-CVE-2021-47235
Debian:13linux5.10.46-1DEBIAN-CVE-2021-47235
Debian:14linux5.10.46-1DEBIAN-CVE-2021-47235
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47235
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47235
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47235

Affected products (as reported)

VendorProductVersions
Linux Linux 6af55ff52b02d492d45db88df3e461fa51a6f753 – before db2bc3cfd2bc01621014d4f17cdfc74611f339c86af55ff52b02d492d45db88df3e461fa51a6f753 – before 1cafc540b7bf1b6a5a77dc000205fe337ef6eba66af55ff52b02d492d45db88df3e461fa51a6f753 – before b1ad283755095a4b9d1431aeb357d7df1a33d3bb6af55ff52b02d492d45db88df3e461fa51a6f753 – before 0260916843cc74f3906acf8b6f256693e01530a26af55ff52b02d492d45db88df3e461fa51a6f753 – before 19f88ca68ccf8771276a606765239b167654f84a6af55ff52b02d492d45db88df3e461fa51a6f753 – before 95deeb29d831e2fae608439e243e7a520611e7ea6af55ff52b02d492d45db88df3e461fa51a6f753 – before d11d79e52ba080ee567cb7d7eb42a5ade60a81306af55ff52b02d492d45db88df3e461fa51a6f753 – before 9cca0c2d70149160407bda9a9446ce0c29b6e6c6
Linux Linux 3.15

References