ASA-2020-00039 – Linux kernel: SELinux netlink permission check bypass due to SELinux incorrectly assume that an skb would only contain a single netlink message

A flaw was found in the Linux kernels SELinux LSM hook implementation, where it incorrectly assumed that an skb would only contain a single netlink message. The hook would incorrectly only validate the first netlink message in the skb and allow or deny the rest of the messages within the skb with the granted permission without further processing.

ASA-2019-00658 – Linux kernel: Mounting a crafted btrfs filesystem image can lead to a use-after-free through syncfs system call

Mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.c because the pointer to a left data structure can be the same as the pointer to a right data structure.

ASA-2019-00657 – Linux kernel: Use-after-free vulnerability when deleting a file from a recently unmounted specially crafted ext4 filesystem

A flaw was found in the Linux kernel's ext4_unlink function. An attacker could corrupt memory or escalate privileges when deleting a file from a recently unmounted specially crafted ext4 filesystem, including local, USB, and iSCSI.

ASA-2019-00662 – Git: Recursive submodule cloning allows using git directory twice with synonymous directory name written in .git/

When submodules are cloned recursively, under certain circumstances Git could be fooled into using the same Git directory twice. When using submodule paths that refer to the same file system entity (e.g. using the NTFS Alternate Data Streams attack mentioned in CVE-2019-1352 where files would be written to the `.git/` directory using a synonymous directory name), it was possible to "squat" on the `git~1` shortname on NTFS drives, opening attacks via `git~2`. This also affects Git when run as a Linux application inside the Windows Subsystem for Linux.

ASA-2019-00644 – Linux kernel: A memory leak in ql_alloc_large_buffers()

A memory leak in the ql_alloc_large_buffers() function in drivers/net/ethernet/qlogic/qla3xxx.c in the Linux kernel allows local users to cause a denial of service (memory consumption) by triggering pci_dma_mapping_error() failures.

ASA-2019-00643 – Linux kernel: Two memory leaks in sja1105_static_config_upload()

Two memory leaks in the sja1105_static_config_upload() function in drivers/net/dsa/sja1105/sja1105_spi.c in the Linux kernel allow attackers to cause a denial of service (memory consumption) by triggering static_config_buf_prepare_for_upload() or sja1105_inhibit_tx() failures.