CVE-2019-19448

In the Linux kernel 5.0.21 and 5.3.11, 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.

In the Linux kernel 5.0.21 and 5.3.11, 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.

• openvswitch: fix OOB access in reserve_sfa_size() {CVE-2022-2639}
• xen/blkfront: fix leaking data in shared pages {CVE-2022-26365}
• Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() {CVE-2020-36386}
• btrfs: only search for left_info if there is no right_info in try_merge_free_space {CVE-2019-19448}
• filldir[64]: remove WARN_ON_ONCE() for bad directory entries {CVE-2019-10220}
• Make filldir64 verify the directory entry filename is valid {CVE-2019-10220}
• ath9k: release allocated buffer if timed out {CVE-2019-19074}
• net: sched: sch_qfq: prevent slab-out-of-bounds in {CVE-2023-31436}
• memstick: r592: Fix UAF bug in r592_remove due to race {CVE-2023-3141}
• wifi: rndis_wlan: Prevent buffer overflow in rndis_query_oid {CVE-2023-23559}
• ext4: fix kernel infoleak via ext4_extent_header {CVE-2022-0850}

• openvswitch: fix OOB access in reserve_sfa_size() {CVE-2022-2639}
• xen/blkfront: fix leaking data in shared pages {CVE-2022-26365}
• Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() {CVE-2020-36386}
• btrfs: only search for left_info if there is no right_info in try_merge_free_space {CVE-2019-19448}
• filldir[64]: remove WARN_ON_ONCE() for bad directory entries {CVE-2019-10220}
• Make filldir64 verify the directory entry filename is valid {CVE-2019-10220}
• ath9k: release allocated buffer if timed out {CVE-2019-19074}
• net: sched: sch_qfq: prevent slab-out-of-bounds in {CVE-2023-31436}
• memstick: r592: Fix UAF bug in r592_remove due to race {CVE-2023-3141}
• wifi: rndis_wlan: Prevent buffer overflow in rndis_query_oid {CVE-2023-23559}
• ext4: fix kernel infoleak via ext4_extent_header {CVE-2022-0850}

• openvswitch: fix OOB access in reserve_sfa_size() {CVE-2022-2639}
• xen/blkfront: fix leaking data in shared pages {CVE-2022-26365}
• Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() {CVE-2020-36386}
• btrfs: only search for left_info if there is no right_info in try_merge_free_space {CVE-2019-19448}
• filldir[64]: remove WARN_ON_ONCE() for bad directory entries {CVE-2019-10220}
• Make filldir64 verify the directory entry filename is valid {CVE-2019-10220}
• ath9k: release allocated buffer if timed out {CVE-2019-19074}
• net: sched: sch_qfq: prevent slab-out-of-bounds in {CVE-2023-31436}
• memstick: r592: Fix UAF bug in r592_remove due to race {CVE-2023-3141}
• wifi: rndis_wlan: Prevent buffer overflow in rndis_query_oid {CVE-2023-23559}
• ext4: fix kernel infoleak via ext4_extent_header {CVE-2022-0850}

• openvswitch: fix OOB access in reserve_sfa_size() {CVE-2022-2639}
• xen/blkfront: fix leaking data in shared pages {CVE-2022-26365}
• Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() {CVE-2020-36386}
• btrfs: only search for left_info if there is no right_info in try_merge_free_space {CVE-2019-19448}
• filldir[64]: remove WARN_ON_ONCE() for bad directory entries {CVE-2019-10220}
• Make filldir64 verify the directory entry filename is valid {CVE-2019-10220}
• ath9k: release allocated buffer if timed out {CVE-2019-19074}
• net: sched: sch_qfq: prevent slab-out-of-bounds in {CVE-2023-31436}
• memstick: r592: Fix UAF bug in r592_remove due to race {CVE-2023-3141}
• wifi: rndis_wlan: Prevent buffer overflow in rndis_query_oid {CVE-2023-23559}
• ext4: fix kernel infoleak via ext4_extent_header {CVE-2022-0850}

This update is based on the upstream 5.7.19 kernel and fixes at least the following security issue:

In the Linux kernel 5.0.21 and 5.3.11, 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 (CVE-2019-19448).

A memory out-of-bounds read flaw was found in the Linux kernel's ext3/ext4 filesystem, in the way it accesses a directory with broken indexing. This flaw allows a local user to crash the system if the directory exists. The highest threat from this vulnerability is to system availability (CVE-2020-14314).

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

Also, the wireguard-tools package has been updated to version 1.0.20200827.

Hadar Manor discovered that the DCCP protocol implementation in the Linux kernel improperly handled socket reuse, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-16119)

Wen Xu discovered that the XFS file system in the Linux kernel did not properly validate inode metadata in some situations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10322)

It was discovered that the btrfs file system in the Linux kernel contained a use-after-free vulnerability when merging free space. An attacker could use this to construct a malicious btrfs image that, when mounted and operated on, could cause a denial of service (system crash). (CVE-2019-19448)

Jay Shin discovered that the ext4 file system implementation in the Linux kernel did not properly handle directory access with broken indexing, leading to an out-of-bounds read vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-14314)

Giuseppe Scrivano discovered that the overlay file system in the Linux kernel did not properly perform permission checks in some situations. A local attacker could possibly use this to bypass intended restrictions and gain read access to restricted files. (CVE-2020-16120)

It was discovered that the NFS client implementation in the Linux kernel did not properly perform bounds checking before copying security labels in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

It was discovered that the NFC implementation in the Linux kernel did not properly perform permissions checks when opening raw sockets. A local attacker could use this to create or listen to NFC traffic. (CVE-2020-26088)