🛡️ MGASA-2021-0575 — kernel-linus (CVE-2021-4083 +2 more)

Updated kernel-linus packages fix security vulnerabilities

This kernel-linus update is based on upstream 5.15.10 and fixes at least the

following security issues:

A read-after-free memory flaw was found in the Linux kernel's garbage

collection for Unix domain socket file handlers in the way users call

close() and fget() simultaneously and can potentially trigger a race

condition. This flaw allows a local user to crash the system or escalate

their privileges on the system (CVE-2021-4083).

An attacker can access kernel memory bypassing valid buffer boundaries by

exploiting implementation of control request handlers in the following usb

gadgets - rndis, hid, uac1, uac1_legacy and uac2. Processing of malicious

control transfer requests with unexpectedly large wLength lacks assurance

that this value does not exceed the buffer size. Due to this fact one is

capable of reading and/or writing (depending on particular case) up to 65k

of kernel memory. Devices implementing affected usb device gadget classes

may be affected by buffer overflow vulnerabilities resulting in information

disclosure, denial of service or execution of arbitrary code in kernel

context (CVE-2021-39685).

In the Linux kernel through 5.15.2, hw_atl_utils_fw_rpc_wait in drivers/net/

ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c allows an attacker (who can

introduce a crafted device) to trigger an out-of-bounds write via a crafted

length value (CVE-2021-43975).

For other upstream fixes, see the referenced changelogs.