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Vulnerability · Published May 22, 2024 · Assigned by Linux

CVE-2021-47434xhci: Fix command ring pointer corruption while aborting a command

Medium 5.5

In plain English

A medium-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)5.5Medium
Exploit odds (30 days)0.2%top 85.3% 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: xhci: Fix command ring pointer corruption while aborting a command The command ring pointer is located at [6:63] bits of the command ring control register (CRCR). All the control bits like command stop, abort are located at [0:3] bits. While aborting a command, we read the CRCR and set the abort bit and write to the CRCR. The read will always give command ring pointer as all zeros. So we essentially write only the control bits. Since we split the 64 bit write into two 32 bit writes, there is a possibility of xHC command ring stopped before the upper dword (all zeros) is written. If that happens, xHC updates the upper dword of its internal command ring pointer with all zeros. Next time, when the command ring is restarted, we see xHC memory access failures. Fix this issue by only writing to the lower dword of CRCR where all control bits are located.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.14.16-1DEBIAN-CVE-2021-47434
Debian:13linux5.14.16-1DEBIAN-CVE-2021-47434
Debian:14linux5.14.16-1DEBIAN-CVE-2021-47434
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47434
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47434
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47434

Affected products (as reported)

VendorProductVersions
Linux Linux b92cc66c047ff7cf587b318fe377061a353c120f – before 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0b92cc66c047ff7cf587b318fe377061a353c120f – before 62c182b5e763e5f4062e72678e72ce3e02dd4d1bb92cc66c047ff7cf587b318fe377061a353c120f – before 01c2dcb67e71c351006dd17cbba86c26b7f61eafb92cc66c047ff7cf587b318fe377061a353c120f – before dec944bb7079b37968cf69c8a438f91f15c4cc61b92cc66c047ff7cf587b318fe377061a353c120f – before e54abefe703ab7c4e5983e889babd1447738ca42b92cc66c047ff7cf587b318fe377061a353c120f – before ff0e50d3564f33b7f4b35cadeabd951d66cfc570bc47204b268516ae4085ebdc81a34ddda71b77c488bd928daafb5912c269af628b1e5347620c9a62
Linux Linux 3.7

References