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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47361mcb: fix error handling in mcb_alloc_bus()

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 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.2%top 84.5% 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: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.14.9-1DEBIAN-CVE-2021-47361
Debian:13linux5.14.9-1DEBIAN-CVE-2021-47361
Debian:14linux5.14.9-1DEBIAN-CVE-2021-47361
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47361
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47361
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47361

Affected products (as reported)

VendorProductVersions
Linux Linux 18d28819809909c3f24bb72183a901c5e332a63d – before 8a558261fa57a6deefb0925ab1829f698b194aea18d28819809909c3f24bb72183a901c5e332a63d – before 115b07d9f47e3996430b8f2007edd9768e1f807f18d28819809909c3f24bb72183a901c5e332a63d – before 66f74ba9be9daf9c47fface6af3677f602774f6b18d28819809909c3f24bb72183a901c5e332a63d – before 7751f609eadf36b1f53712bae430019c53a16eb018d28819809909c3f24bb72183a901c5e332a63d – before 91e4ad05bf18322b5921d1a6c9b603f6eb1694f018d28819809909c3f24bb72183a901c5e332a63d – before 9fc198f415dee070a1de957bb5bf5921d8df349918d28819809909c3f24bb72183a901c5e332a63d – before 25a1433216489de4abc889910f744e952cb6dbae
Linux Linux 4.7

References