MGASA-2023-0148

This kernel update is based on upstream 5.15.106 and fixes atleast the following security issues:

A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAPNETADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters (CVE-2023-1076).

In the Linux kernel, picknextrtentity() may return a type confused entry, not detected by the BUGON condition, as the confused entry will not be NULL, but listhead.The buggy error condition would lead to a type confused entry with the list head,which would then be used as a type confused schedrt_entity,causing memory corruption (CVE-2023-1077).

A flaw was found in the Linux kernel. A use-after-free may be triggered in asuskbdbacklightset when plugging/disconnecting in a malicious USB device, which advertises itself as an Asus device. Similarly to the previous known CVE-2023-25012, but in asus devices, the workstruct may be scheduled by the LED controller while the device is disconnecting, triggering a use-after-free on the struct asuskbdleds *led structure. A malicious USB device may exploit the issue to cause memory corruption with controlled data (CVE-2023-1079).

A flaw use after free in the Linux kernel integrated infrared receiver/ transceiver driver was found in the way user detaching rc device. A local user could use this flaw to crash the system or potentially escalate their privileges on the system (CVE-2023-1118).

A use-after-free flaw was found in btrfssearchslot in fs/btrfs/ctree.c in btrfs in the Linux Kernel.This flaw allows an attacker to crash the system and possibly cause a kernel information leak (CVE-2023-1611).

A flaw use after free in the Linux kernel Xircom 16-bit PCMCIA (PC-card) Ethernet driver was found.A local user could use this flaw to crash the system or potentially escalate their privileges on the system (CVE-2023-1670).

A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate filters in case of a perfect hashes while deleting the underlying structure which can later lead to double freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to root (CVE-2023-1829).

A use-after-free flaw was found in xgenehwmonremove in drivers/hwmon/ xgene-hwmon.c in the Hardware Monitoring Linux Kernel Driver (xgene-hwmon). This flaw could allow a local attacker to crash the system due to a race problem. This vulnerability could even lead to a kernel information leak problem (CVE-2023-1855).

A use-after-free flaw was found in btsdioremove in drivers\bluetooth\ btsdio.c in the Linux Kernel. In this flaw, a call to btsdioremove with an unfinished job, may cause a race problem leading to a UAF on hdev devices (CVE-2023-1989).

A use-after-free flaw was found in ndlc_remove in drivers/nfc/st-nci/ndlc.c in the Linux Kernel. This flaw could allow an attacker to crash the system due to a race problem (CVE-2023-1990).

A flaw was found in the Linux kernel Traffic Control (TC) subsystem. Using a specific networking configuration (redirecting egress packets to ingress using TC action "mirred") a local unprivileged user could trigger a CPU soft lockup (ABBA deadlock) when the transport protocol in use (TCP or SCTP) does a retransmission, resulting in a denial of service condition (CVE-2022-4269).

A use-after-free vulnerability was found in _nfs42ssc_open() in fs/nfs/nfs4file.c in the Linux kernel. This flaw allows an attacker to conduct a remote denial of service (CVE-2022-4379).

The Linux kernel through 6.1.9 has a Use-After-Free in bigben_remove in drivers/hid/hid-bigbenff.c via a crafted USB device because the LED controllers remain registered for too long (CVE-2023-25012).

dotlsgetsockopt in net/tls/tlsmain.c in the Linux kernel through 6.2.6 lacks a locksock call, leading to a race condition (with a resultant use-after-free or NULL pointer dereference) (CVE-2023-28466).

An issue was discovered in arch/x86/kvm/vmx/nested.c in the Linux kernel before 6.2.8. nVMX on x86_64 lacks consistency checks for CR0 and CR4 (CVE-2023-30456).

The Linux kernel before 6.2.9 has a race condition and resultant use-after-free in drivers/power/supply/da9150-charger.c if a physically proximate attacker unplugs a device (CVE-2023-30772).

For other upstream fixes in this update, see the referenced changelogs.