RHSA-2021:4056: Important: kernel security, bug fix, and enhancement update
The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free (CVE-2020-36385) kernel: out-of-bounds write due to a heap buffer overflow in hidinputchangeresolutionmultipliers() of hid-input.c (CVE-2021-0512) kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE) (CVE-2021-3656) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.Bug Fix(es): [HPE 8.3 bug] No EDAC MC0 message with one-DIMM two-processor configuration under RHEL8.3 (BZ#1982182) mlx: devlink port function shows all zero hwaddr (BZ#1986837) net/sched: actmirred: allow saving the last chain processed on xmit path (BZ#1992230) RHEL8.3 - System hang and / or r/o fs during SVC/v5k/v7k maintenance with ibmvfc (BZ#1993892) RHEL8.1 Snapshot3 - PVT:940:virt:4TB:LPM operation failed by returning HSCLA2CF, HSCL365C SRC's - Linux partition suspend timeout (-> documentation/Linux Alert through LTC bug 182549) (BZ#1993952) RHEL8.4 - benchTableRepDMLAsyncBarrier regresses by 34% on RHEL8.4 on POWER9 compared to RHEL8.2 (performance) (BZ#1997431) [panic] call trace: iceprobe+0x238/0x10f0 [ice] (BZ#1997539) [ice, PTP] ice: fix GPIO 1PPS signal (BZ#1997572) Fix locality handling in the tpmtis driver (BZ#1998219) [ice, PTP]: fix Tx queue iteration for Tx timestamp enablement (BZ#2000128) PCI passthrough with NVidia GPU "Invalid device 0003:01:00.0 iommugroup file /sys/bus/pci/devices/0003:01:00.0/iommugroup is not a symlink" (BZ#2000602) [DELL 8.4 BUG] - System Hangs at Dell Logo When Boot to OS(e1000e with wrong GbE checksum) (BZ#2002335) RHEL8.4 - kernel: Fix hanging ioctl caused by wrong msg counter (BZ#2002635) kernel: gettimespec64 does not ignore padding in compat syscalls (BZ#2003569) [mlx5] eth0: hw csum failure (BZ#2005980) xloggrantheadwait() does not return and system hangs (BZ#2007413) panic while breaking a lease/delegation after user mode helper invocation (BZ#2010331) Lockd invalid cast to nlmlockowner (BZ#2010820) [xfstests generic/388] XFS: Assertion failed: 0, file: fs/xfs/xfsmount.c, line: 1218 (BZ#2011919) Enhancement(s): [Intel 8.5 FEAT] ice: Enable PTP Support (BZ#1998220) [Intel 8.5 FEAT] ice: Enable GPIO/SDP Support (BZ#1998221)
Affected Software
Remediation
Event History
Frequently Asked Questions
What security issues are fixed in RHSA-2021:4056?
RHSA-2021:4056 addresses a use-after-free vulnerability in drivers/infiniband/core/ucma.c (CVE-2020-36385) and an out-of-bounds write due to a heap buffer overflow.
What is the severity of RHSA-2021:4056?
The severity of RHSA-2021:4056 is considered critical due to the potential for remote code execution.
How can I fix RHSA-2021:4056?
To fix RHSA-2021:4056, update the affected kernel packages to version 4.18.0-305.25.1.el8_4.
Which versions of the kernel are affected by RHSA-2021:4056?
Versions of the kernel prior to 4.18.0-305.25.1.el8_4 are affected by RHSA-2021:4056.
Is RHSA-2021:4056 applicable to all Linux systems?
RHSA-2021:4056 specifically applies to Red Hat Enterprise Linux 8 systems utilizing the affected kernel packages.