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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47311net: qcom/emac: fix UAF in emac_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 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.3%top 83.5% 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: qcom/emac: fix UAF in emac_remove adpt is netdev private data and it cannot be used after free_netdev() call. Using adpt after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-abi-stablelists4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-core4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-cross-headers4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-core4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-modules4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-doc4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-headers4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-modules4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-modules-extra4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-rt4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-core4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-core4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-kvm4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-devel4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-kvm4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-modules4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.8.1.rt7.349.el8_10ALSA-2024:4352
AlmaLinux:8kernel-tools4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-tools-libs4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8perf4.18.0-553.8.1.el8_10ALSA-2024:4211
AlmaLinux:8python3-perf4.18.0-553.8.1.el8_10ALSA-2024:4211
Debian:12linux5.14.6-1DEBIAN-CVE-2021-47311
Debian:13linux5.14.6-1DEBIAN-CVE-2021-47311
Debian:14linux5.14.6-1DEBIAN-CVE-2021-47311
Rocky Linux:8kernel0:4.18.0-553.8.1.el8_10RLSA-2024:4211
Rocky Linux:8kernel-rt0:4.18.0-553.8.1.rt7.349.el8_10RLSA-2024:4352
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47311
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47311
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47311

Affected products (as reported)

VendorProductVersions
Linux Linux 54e19bc74f3380d414681762ceed9f7245bc6a6e – before 4d04a42b926e682140776e54188f4a44f1f01a8154e19bc74f3380d414681762ceed9f7245bc6a6e – before b1e091331920f8fbfc747dcbd16263fcd71abb2d54e19bc74f3380d414681762ceed9f7245bc6a6e – before 11e9d163d631198bb3eb41a677a61b499516c0f754e19bc74f3380d414681762ceed9f7245bc6a6e – before 2b70ca92847c619d6264c7372ef74fcbfd1e048c54e19bc74f3380d414681762ceed9f7245bc6a6e – before b560521eca03d0a2db6093a5a632cbdd0a0cf83354e19bc74f3380d414681762ceed9f7245bc6a6e – before 8a225a6e07a57a1538d53637cb3d82bd3e47783954e19bc74f3380d414681762ceed9f7245bc6a6e – before ad297cd2db8953e2202970e9504cab247b6c7cb4
Linux Linux 4.9

References