CVE-2018-20856

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

The SUSE Linux Enterprise 12 SP3 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2019-1125: Enable Spectre v1 swapgs mitigations (bsc#1139358).
• CVE-2018-20855: An issue was discovered in create_qp_common in drivers/infiniband/hw/mlx5/qp.c, mlx5_ib_create_qp_resp was never initialized, resulting in a leak of stack memory to userspace (bsc#1143045).
• CVE-2019-14284: The drivers/block/floppy.c allowed a denial of service by setup_format_params division-by-zero. Two consecutive ioctls can trigger the bug: the first one should set the drive geometry with .sect and .rate values that make F_SECT_PER_TRACK be zero. Next, the floppy format operation should be called. It can be triggered by an unprivileged local user even when a floppy disk has not been inserted. NOTE: QEMU creates the floppy device by default (bsc#1143189).
• CVE-2019-14283: The function set_geometry in drivers/block/floppy.c did not validate the sect and head fields, as demonstrated by an integer overflow and out-of-bounds read. It can be triggered by an unprivileged local user when a floppy disk has been inserted. NOTE: QEMU creates the floppy device by default (bsc#1143191).
• CVE-2019-11810: A NULL pointer dereference can occur when megasas_create_frame_pool() fails in megasas_alloc_cmds() in drivers/scsi/megaraid/megaraid_sas_base.c. This causes a Denial of Service, related to a use-after-free (bsc#1134399).
• CVE-2019-13648: In the Linux kernel on the powerpc platform, when hardware transactional memory is disabled, a local user can cause a denial of service (TM Bad Thing exception and system crash) via a sigreturn() system call that sends a crafted signal frame. This affects arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c (bnc#1142254).
• CVE-2019-13631: In parse_hid_report_descriptor in drivers/input/tablet/gtco.c, a malicious USB device can send an HID report that triggers an out-of-bounds write during generation of debugging messages (bsc#1142023).
• CVE-2019-15118: Fixed kernel stack exhaustion in check_input_term in sound/usb/mixer.c via mishandled recursion (bnc#1145922).
• CVE-2019-15117: Fixed out-of-bounds memory access in parse_audio_mixer_unit in sound/usb/mixer.c via mishandled short descriptor (bnc#1145920).
• CVE-2019-3819: A flaw was fixed in the function hid_debug_events_read() in drivers/hid/hid-debug.c file which may have enter an infinite loop with certain parameters passed from a userspace. A local privileged user ('root') could have caused a system lock up and a denial of service (bnc#1123161).
• CVE-2019-10207: Check for missing tty operations in bluetooth/hci_uart (bsc#1142857).
• CVE-2018-20856: Fixed a use-after-free issue in block/blk-core.c, where certain error case are mishandled (bnc#1143048).

The following non-security bugs were fixed:

• cifs: do not log STATUS_NOT_FOUND errors for DFS (bsc#1125674).
• dlm: Fix saving of NULL callbacks (bsc#1135365).
• bcache: Revert 'bcache: fix high CPU occupancy during journal' (bsc#1140652, bsc#1144288).
• bcache: Revert 'bcache: free heap cache_set->flush_btree in bch_journal_free' (bsc#1140652, bsc#1144288).
• bcache: add reclaimed_journal_buckets to struct cache_set (bsc#1140652, bsc#1144288).
• bcache: fix race in btree_flush_write() (bsc#1140652, bsc#1144288).
• bcache: fix stack corruption by PRECEDING_KEY() (bsc#1130972, bsc#1144257).
• bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached (bsc#1130972, bsc#1144273).
• bcache: performance improvement for btree_flush_write() (bsc#1140652, bsc#1144288).
• bcache: remove retry_flush_write from struct cache_set (bsc#1140652, bsc#1144288).
• bonding: Force slave speed check after link state recovery for 802.3ad (bsc#1137584).
• clocksource: Defer override invalidation unless clock is unstable (bsc#1139826).
• kvm: mmu: Fix overflow on kvm mmu page limit calculation (bsc#1135335).
• kvmclock: fix TSC calibration for nested guests (bsc#1133860,…

The SUSE Linux Enterprise 12 SP2 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2019-3819: A flaw was fixed in the function hid_debug_events_read() in drivers/hid/hid-debug.c file which may have enter an infinite loop with certain parameters passed from a userspace. A local privileged user ('root') could have caused a system lock up and a denial of service (bnc#1123161).
• CVE-2019-15118: Fixed kernel stack exhaustion in check_input_term in sound/usb/mixer.c via mishandled recursion (bnc#1145922).
• CVE-2019-15117: Fixed out-of-bounds memory access in parse_audio_mixer_unit in sound/usb/mixer.c via mishandled short descriptor (bnc#1145920).
• CVE-2019-14284: The drivers/block/floppy.c allowed a denial of service by setup_format_params division-by-zero. Two consecutive ioctls can trigger the bug: the first one should set the drive geometry with .sect and .rate values that make F_SECT_PER_TRACK be zero. Next, the floppy format operation should be called. It can be triggered by an unprivileged local user even when a floppy disk has not been inserted. NOTE: QEMU creates the floppy device by default (bsc#1143189).
• CVE-2019-14283: The function set_geometry in drivers/block/floppy.c did not validate the sect and head fields, as demonstrated by an integer overflow and out-of-bounds read. It can be triggered by an unprivileged local user when a floppy disk has been inserted. NOTE: QEMU creates the floppy device by default (bsc#1143191).
• CVE-2019-13631: In parse_hid_report_descriptor in drivers/input/tablet/gtco.c, a malicious USB device can send an HID report that triggers an out-of-bounds write during generation of debugging messages (bsc#1142023).
• CVE-2019-11810: A NULL pointer dereference can occur when megasas_create_frame_pool() fails in megasas_alloc_cmds() in drivers/scsi/megaraid/megaraid_sas_base.c. This causes a Denial of Service, related to a use-after-free (bsc#1134399).
• CVE-2019-1125: Enable Spectre v1 swapgs mitigations (bsc#1139358).
• CVE-2019-10207: Check for missing tty operations in bluetooth/hci_uart (bsc#1142857).
• CVE-2018-20856: Fixed a use-after-free issue in block/blk-core.c, where certain error case are mishandled (bnc#1143048).
• CVE-2018-20855: An issue was discovered in create_qp_common in drivers/infiniband/hw/mlx5/qp.c, mlx5_ib_create_qp_resp was never initialized, resulting in a leak of stack memory to userspace (bsc#1143045).
• CVE-2017-18551: An issue was discovered in drivers/i2c/i2c-core-smbus.c in the Linux kernel There was an out of bounds write in the function i2c_smbus_xfer_emulated (bnc#1146163).

The following non-security bugs were fixed:

• bcache: add reclaimed_journal_buckets to struct cache_set (bsc#1140652, bsc#1144288).
• bcache: fix race in btree_flush_write() (bsc#1140652, bsc#1144288).
• bcache: fix stack corruption by PRECEDING_KEY() (bsc#1130972, bsc#1144257).
• bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached (bsc#1130972, bsc#1144273).
• bcache: performance improvement for btree_flush_write() (bsc#1140652, bsc#1144288).
• bcache: remove retry_flush_write from struct cache_set (bsc#1140652, bsc#1144288).
• btrfs: improve delayed refs iterations (bsc#1076033, bsc#1107256).
• i40e: add functions to control default VSI (bsc#1141628).
• i40e: set default VSI without a reset (bsc#1141628).
• mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing (bsc#1142098).
• nfs: Fix the inode request accounting when pages have subrequests (bsc#1140012).
• powerpc/watchpoint: Restore NV GPRs while returning from exception (bsc#1140945,bsc#1141401,bsc#1141402,bsc#1141452,bsc#1141453,bsc#1141454).
• qib/hfi1: Fix MR reference count leak on write with immediate (bsc#1045640).
• sched/fair: Do not free p->numa_faults with concurrent readers (bsc#1144920).
• sched/fair: Use RCU accessors consistently for ->numa_group (bsc#1144920).
• x86, mm: fix fast GUP with hyper-based TLB flushing (VM Functionality,…

This update for the Linux Kernel 4.4.180-94_100 fixes several issues.

The following security issues were fixed:

• CVE-2018-20856: Fixed a use-after-free in __blk_drain_queue() due to an improper error handling (bsc#1156331).
• CVE-2019-13272: Fixed a privilege escalation from user to root due to improper handling of credentials by leveraging certain scenarios with a parent-child process relationship (bsc#1156321).
• CVE-2019-15239: Fixed a vulnerability where a local attacker could have triggered multiple use-after-free conditions resulted in privilege escalation (bsc#1156317).
• CVE-2019-10220: Fixed an issue where samba servers could inject relative paths in directory entry lists (bsc#1153108).

The following bugs were fixed:

• Fixed boot up hang revealed by int3 self test (bsc#1157770).

This update for the Linux Kernel 4.4.121-92_101 fixes several issues.

The following security issues were fixed:

• CVE-2018-20856: Fixed a use-after-free in __blk_drain_queue() due to an improper error handling (bsc#1156331).
• CVE-2019-13272: Fixed a privilege escalation from user to root due to improper handling of credentials by leveraging certain scenarios with a parent-child process relationship (bsc#1156321).
• CVE-2019-10220: Fixed an issue where samba servers could inject relative paths in directory entry lists (bsc#1153108).

This update for the Linux Kernel 4.12.14-95_3 fixes several issues.

The following security issues were fixed:

• CVE-2019-15917: Fixed a use-after-free when hci_uart_register_dev() fails in hci_uart_set_proto() (bsc#1156334).
• CVE-2018-20856: Fixed a use-after-free in block/blk-core.c due to improper error handling (bsc#1156331).
• CVE-2019-13272: Fixed a privilege escalation from user to root due to improper handling of credentials by leveraging certain scenarios with a parent-child process relationship (bsc#1156321).
• CVE-2018-16871: Fixed an issue where an attacker, who could mount an exported NFS filesystem, was able to trigger a null pointer dereference by using an invalid NFS sequence leading to kernel panic and deny of access to the NFS server (bsc#1156320).
• CVE-2019-10220: Fixed an issue where samba servers could inject relative paths in directory entry lists (bsc#1153108).

This update for the Linux Kernel 4.4.178-94_91 fixes several issues.

The following security issues were fixed:

• CVE-2018-20856: Fixed a use-after-free in block/blk-core.c due to improper error handling (bsc#1156331).
• CVE-2019-13272: Fixed a privilege escalation from user to root due to improper handling of credentials by leveraging certain scenarios with a parent-child process relationship (bsc#1156321).
• CVE-2019-15239: Fixed a vulnerability where a local attacker could have triggered multiple use-after-free conditions resulted in privilege escalation (bsc#1156317).
• CVE-2019-10220: Fixed an issue where samba servers could inject relative paths in directory entry lists (bsc#1153108).

This update for the Linux Kernel 4.4.121-92_109 fixes several issues.

The following security issues were fixed:

• CVE-2018-20856: Fixed a use-after-free in __blk_drain_queue() due to an improper error handling (bsc#1156331).
• CVE-2019-13272: Fixed a privilege escalation from user to root due to improper handling of credentials by leveraging certain scenarios with a parent-child process relationship (bsc#1156321).
• CVE-2019-10220: Fixed an issue where samba servers could inject relative paths in directory entry lists (bsc#1153108).

This update for the Linux Kernel 4.4.121-92_117 fixes several issues.

The following security issues were fixed:

• CVE-2018-20856: Fixed a use-after-free in __blk_drain_queue() due to an improper error handling (bsc#1156331).
• CVE-2019-13272: Fixed a privilege escalation from user to root due to improper handling of credentials by leveraging certain scenarios with a parent-child process relationship (bsc#1156321).
• CVE-2019-10220: Fixed an issue where samba servers could inject relative paths in directory entry lists (bsc#1153108).

The following bugs were fixed:

• Fixed boot up hang revealed by int3 self test (bsc#1157770).

It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. (CVE-2018-13053)

Wen Xu discovered that the XFS filesystem implementation in the Linux kernel did not properly track inode validations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13093)

Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14614, CVE-2018-14616, CVE-2018-13096, CVE-2018-13098, CVE-2018-14615)

Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613, CVE-2018-14609)

Wen Xu discovered that the HFS+ filesystem implementation in the Linux kernel did not properly handle malformed catalog data in some situations. An attacker could use this to construct a malicious HFS+ image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14617)

Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem of the Linux kernel did not properly initialize new files in some situations. A local attacker could use this to expose sensitive information. (CVE-2018-16862)

Hui Peng and Mathias Payer discovered that the USB subsystem in the Linux kernel did not properly handle size checks when handling an extra USB descriptor. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-20169)

It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-20856)

Eli Biham and Lior Neumann discovered that the Bluetooth implementation in the Linux kernel did not properly validate elliptic curve parameters during Diffie-Hellman key exchange in some situations. An attacker could use this to expose sensitive information. (CVE-2018-5383)

It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-10126)

Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors incorrectly handle SWAPGS instructions during speculative execution. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2019-1125)

It was discovered that the PowerPC dlpar implementation in the Linux kernel did not properly check for allocation errors in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-12614)

It was discovered that a NULL pointer dereference vulnerabilty existed in the Near-field communication (NFC) implementation in the Linux kernel. An attacker could use this to cause a denial of service (system crash). (CVE-2019-12818)

It was discovered that the MDIO bus devices subsystem in the Linux kernel improperly dropped a device reference in an error condition, leading to a use-after-free. An attacker could use this to cause a denial of service (system crash). (CVE-2019-12819)

It was discovered that a NULL pointer dereference vulnerability existed in the Near-field communication (NFC) implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-12984)

Jann…

It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-20856)

Amit Klein and Benny Pinkas discovered that the Linux kernel did not sufficiently randomize IP ID values generated for connectionless networking protocols. A remote attacker could use this to track particular Linux devices. (CVE-2019-10638)

Praveen Pandey discovered that the Linux kernel did not properly validate sent signals in some situations on PowerPC systems with transactional memory disabled. A local attacker could use this to cause a denial of service. (CVE-2019-13648)

It was discovered that the floppy driver in the Linux kernel did not properly validate meta data, leading to a buffer overread. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-14283)

It was discovered that the floppy driver in the Linux kernel did not properly validate ioctl() calls, leading to a division-by-zero. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-14284)

Jason Wang discovered that an infinite loop vulnerability existed in the virtio net driver in the Linux kernel. A local attacker in a guest VM could possibly use this to cause a denial of service in the host system. (CVE-2019-3900)

It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. (CVE-2018-13053)

Wen Xu discovered that the XFS filesystem implementation in the Linux kernel did not properly track inode validations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13093)

Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13096, CVE-2018-13097, CVE-2018-13098, CVE-2018-13099, CVE-2018-13100, CVE-2018-14614, CVE-2018-14615, CVE-2018-14616)

Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14609, CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613)

Wen Xu discovered that the HFS+ filesystem implementation in the Linux kernel did not properly handle malformed catalog data in some situations. An attacker could use this to construct a malicious HFS+ image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14617)

Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem of the Linux kernel did not properly initialize new files in some situations. A local attacker could use this to expose sensitive information. (CVE-2018-16862)

Hui Peng and Mathias Payer discovered that the Option USB High Speed driver in the Linux kernel did not properly validate metadata received from the device. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-19985)

Hui Peng and Mathias Payer discovered that the USB subsystem in the Linux kernel did not properly handle size checks when handling an extra USB descriptor. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-20169)

Zhipeng Xie discovered that an infinite loop could be triggered in the CFS Linux kernel process scheduler. A local attacker could possibly use this to cause a denial of service. (CVE-2018-20784)

It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-20856)

Eli Biham and Lior Neumann discovered that the Bluetooth implementation in the Linux kernel did not properly validate elliptic curve parameters during Diffie-Hellman key exchange in some situations. An attacker could use this to expose sensitive information. (CVE-2018-5383)

It was discovered that the Intel Wi-Fi device driver in the Linux kernel did not properly validate certain Tunneled Direct Link Setup (TDLS). A physically proximate attacker could use this to cause a denial of service (Wi-Fi disconnect). (CVE-2019-0136)

It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-10126)

It was discovered that the Bluetooth UART implementation in the Linux kernel did not properly check for missing tty operations. A local attacker could use this to cause a denial of service. (CVE-2019-10207)

Amit Klein and Benny Pinkas discovered that the Linux kernel did not sufficiently randomize IP ID values generated for connectionless networking protocols. A remote attacker could use this to track particular Linux devices. (CVE-2019-10638)

Amit Klein and Benny Pinkas discovered that…