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CVE-2021-46904

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.

Related Files

Ubuntu Security Notice USN-6976-1
Posted Aug 22, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6976-1 - Yuxuan Hu discovered that the Bluetooth RFCOMM protocol driver in the Linux Kernel contained a race condition, leading to a NULL pointer dereference. An attacker could possibly use this to cause a denial of service. It was discovered that a race condition existed in the Bluetooth subsystem in the Linux kernel, leading to a null pointer dereference vulnerability. A privileged local attacker could use this to possibly cause a denial of service.

tags | advisory, denial of service, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2021-46904, CVE-2021-47171, CVE-2021-47173, CVE-2021-47518, CVE-2021-47571, CVE-2022-48659, CVE-2023-52470, CVE-2023-52644, CVE-2023-52760, CVE-2024-22099, CVE-2024-24860, CVE-2024-26654, CVE-2024-26687, CVE-2024-26903
SHA-256 | 05b1dd718bcd1e6c1a1d60a1aa46ca6c1f9381e6b519d89cafc379f7b4ae0c4a
Ubuntu Security Notice USN-6971-1
Posted Aug 22, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6971-1 - It was discovered that the Option USB High Speed Mobile device driver in the Linux kernel did not properly handle error conditions. A physically proximate attacker could use this to cause a denial of service or possibly execute arbitrary code. A security issue was discovered in the Linux kernel. An attacker could possibly use this to compromise the system.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2021-37159, CVE-2021-46904
SHA-256 | bb97a71e3a2da8d2428ea43816dc2f48de1c69cd5614a154d05c65d34cbda670
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