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Vulnerability · Published Mar 27, 2025 · Assigned by Linux

CVE-2022-49755usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait

High 7.8

In plain English

A high-severity use-after-free 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 3.1)7.8High
Exploit odds (30 days)0.2%top 85.8% 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: usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind. Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free. Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.11-1DEBIAN-CVE-2022-49755
Debian:13linux6.1.11-1DEBIAN-CVE-2022-49755
Debian:14linux6.1.11-1DEBIAN-CVE-2022-49755
Ubuntu:22.04:LTSlinux5.15.0-70.77UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-aws5.15.0-1034.38UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure5.15.0-1036.43UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1036.43.1UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-gcp5.15.0-1032.40UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-gke5.15.0-1031.36UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1018.23UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-ibm5.15.0-1028.31UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1028.33UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-kvm5.15.0-1031.36UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-70.77UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1023.23UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-oracle5.15.0-1033.39UBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-raspi5.15.0-1027.29UBUNTU-CVE-2022-49755
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-49755
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2022-49755
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2022-49755

Affected products (as reported)

VendorProductVersions
Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0 – before facf353c9e8d7885b686d9a4b173d4e0af6441d2ddf8abd2599491cbad959c700b90ba72a5dce8d0 – before e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4ddf8abd2599491cbad959c700b90ba72a5dce8d0 – before a8d40942df074f4ebcb9bd3413596d92f323b064ddf8abd2599491cbad959c700b90ba72a5dce8d0 – before 6dd9ea05534f323668db94fcc2726c7a84547e78ddf8abd2599491cbad959c700b90ba72a5dce8d0 – before ae8e136bcaae96163b5821984de1036efc9abb1addf8abd2599491cbad959c700b90ba72a5dce8d0 – before 6aee197b7fbcd61596a78b47d553f2f99111f217ddf8abd2599491cbad959c700b90ba72a5dce8d0 – before 6a19da111057f69214b97c62fb0ac59023970850
Linux Linux 2.6.35

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References