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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47239net: usb: fix possible use-after-free in smsc75xx_bind

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: usb: fix possible use-after-free in smsc75xx_bind The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") fails to clean up the work scheduled in smsc75xx_reset-> smsc75xx_set_multicast, which leads to use-after-free if the work is scheduled to start after the deallocation. In addition, this patch also removes a dangling pointer - dev->data[0]. This patch calls cancel_work_sync to cancel the scheduled work and set the dangling pointer to NULL.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-1DEBIAN-CVE-2021-47239
Debian:13linux5.10.46-1DEBIAN-CVE-2021-47239
Debian:14linux5.10.46-1DEBIAN-CVE-2021-47239
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47239
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47239
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47239

Affected products (as reported)

VendorProductVersions
Linux Linux 200dbfcad8011e50c3cec269ed7b980836eeb1fa – before 7cc8b2e05fcea6edd022d26e82091d781af8fd9b22c840596af0c09068b6cf948616e6496e59e07f – before 64160d1741a3de5204d1a822e058e0b4cc5265049e6b8c1ff9d997e1fa16cbd2d60739adf6dc1bbc – before c4e3be2e7742863e454ce31faf8fd0109c00050b9e6a3eccb28779710cbbafc4f4258d92509c6d07 – before 2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59bb95fb96e6339e34694dd578fb6bde3575b01af17 – before 4252bf6c2b245f47011098113d405ffad6ad5d5b635ac38b36255d3cfb8312cf7c471334f4d537e0 – before 570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb70c886ac93f87ae7214a0c69151a28a8075dd95b – before 14616c372a7be01a2fb8c56c9d8debd232b9e43d46a8b29c6306d8bbfd92b614ef65a47c900d8e70 – before 56b786d86694e079d8aad9b314e015cd4ac02a3d
Linux Linux 4.4.271 – before 4.4.2744.9.271 – before 4.9.2744.14.235 – before 4.14.2384.19.193 – before 4.19.1965.4.124 – before 5.4.1285.10.42 – before 5.10.465.12.9 – before 5.12.13

References