CVE-2019-19037

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

This update is based on upstream 5.4.10 and fixes at least the following security issues:

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero. (CVE-2019-19037)

It also fixes various potential security issues related to buffer overflows, double frees, NUll pointer dereferences, improper / missing input validations and so on.

Other fixes added in this update:

• Revert 'drm/amdgpu: Set no-retry as default.', fixing amdgpu hang on Raven Ridge gpus (mga#25882)
• drm/i915/gt: Detect if we miss WaIdleLiteRestore, fixes or at least works around gpu hang (mga#25930)
• 3rdparty/rtl8812au: update to v5.6.4.2 (mga#25982)
• add support for RTL8117 ethernet
• rtl8xxxu: Add support for Edimax EW-7611ULB
• mountpoint_last(): fix the treatment of LAST_BIND
• HID: intel-ish-hid: ipc: Add Comet Lake H PCI device ID
• HID: intel-ish-hid: ipc: Add Tiger Lake PCI device ID
• HID: wacom: Recognize new MobileStudio Pro PID
• updates to the arm64 defconfigs:
  • Enable some EFI stuff on arm64 (mga#26003)
  • Enable a lot of missing things on arm64 kernels (including ACPI and Amazon network driver)
  • Disable debug info on arm64 (mga#26015)
  • reduce difference between arm64 and x86_64 defconfigs

WireGuard kernel module has been updated to 0.0.20200105 and the tools has been updated to 1.0.20200102.

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

This update provides upstream 5.4.20, adding support for new hardware and features, and resolves at least the following security issues:

In a Linux KVM guest that has PV TLB enabled, a process in the guest kernel may be able to read memory locations from another process in the same guest. This problem is limit to the host running linux kernel 4.10 with a guest running linux kernel 4.16 or later. The problem mainly affects AMD processors but Intel CPUs cannot be ruled out (CVE-2019-3016).

Intel GPU Hardware prior to Gen11 does not clear EU state during a context switch. This can result in information leakage between contexts (CVE-2019-14615).

A heap-based buffer overflow was discovered in the Marvell WiFi chip driver. The flaw could occur when the station attempts a connection negotiation during the handling of the remote devices country settings. This could allow the remote device to cause a denial of service (system crash) or possibly execute arbitrary code (CVE-2019-14895).

A heap-based buffer overflow vulnerability was found in the Linux kernel, in Marvell WiFi chip driver. A remote attacker could cause a denial of service (system crash) or, possibly execute arbitrary code, when the lbs_ibss_join_existing function is called after a STA connects to an AP (CVE-2019-14896).

A stack-based buffer overflow was found in the Linux kernel, in Marvell WiFi chip driver. An attacker is able to cause a denial of service (system crash) or, possibly execute arbitrary code, when a STA works in IBSS mode (allows connecting stations together without the use of an AP) and connects to another STA (CVE-2019-14897).

ext4_empty_dir in fs/ext4/namei.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero. (CVE-2019-19037)

KVM: x86: fix out-of-bounds write in KVM_GET_EMULATED_CPUID (CVE-2019-19332)

fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed (CVE-2020-8428).