Описание
Security update for the Linux Kernel
The SUSE Linux Enterprise 15 kernel was updated to receive various security and bugfixes.
The following security bugs were fixed:
- CVE-2021-26930: Fixed an improper error handling in blkback's grant mapping (XSA-365 bsc#1181843).
- CVE-2021-26931: Fixed an issue where Linux kernel was treating grant mapping errors as bugs (XSA-362 bsc#1181753).
- CVE-2021-26932: Fixed improper error handling issues in Linux grant mapping (XSA-361 bsc#1181747). by remote attackers to read or write files via directory traversal in an XCOPY request (bsc#178372).
- CVE-2020-29368,CVE-2020-29374: Fixed an issue in copy-on-write implementation which could have granted unintended write access because of a race condition in a THP mapcount check (bsc#1179660, bsc#1179428).
The following non-security bugs were fixed:
- kernel-{binary,source}.spec.in: do not create loop symlinks (bsc#1179082)
- kernel-source.spec: Fix build with rpm 4.16 (boo#1179015).
- rpm/kernel-binary.spec.in: avoid using barewords (bsc#1179014)
- rpm/kernel-binary.spec.in: avoid using more barewords (bsc#1179014) %split_extra still contained two.
- rpm/kernel-binary.spec.in: Fix compressed module handling for in-tree KMP (jsc#SLE-10886) The in-tree KMP that is built with SLE kernels have a different scriptlet that is embedded in kernel-binary.spec.in rather than *.sh files.
- rpm/kernel-binary.spec.in: use grep -E instead of egrep (bsc#1179045) egrep is only a deprecated bash wrapper for 'grep -E'. So use the latter instead.
- rpm/kernel-module-subpackage: make Group tag optional (bsc#1163592)
- rpm/kernel-obs-build.spec.in: Add -q option to modprobe calls (bsc#1178401)
- rpm/kernel-{source,binary}.spec: do not include ghost symlinks (boo#1179082).
- rpm/mkspec: do not build kernel-obs-build on x86_32 We want to use 64bit kernel due to various bugs (bsc#1178762 to name one).
- rpm/post.sh: Avoid purge-kernel for the first installed kernel (bsc#1180058)
- xen/netback: avoid race in xenvif_rx_ring_slots_available() (bsc#1065600).
- xen/netback: fix spurious event detection for common event case (bsc#1182175).
Список пакетов
Image SLES15-Azure-BYOS
Image SLES15-EC2-CHOST-HVM-BYOS
Image SLES15-EC2-HVM-BYOS
Image SLES15-GCE-BYOS
Image SLES15-SAP-Azure
Image SLES15-SAP-Azure-BYOS
Image SLES15-SAP-Azure-LI-BYOS-Production
Image SLES15-SAP-Azure-VLI-BYOS-Production
Image SLES15-SAP-EC2-HVM
Image SLES15-SAP-EC2-HVM-BYOS
Image SLES15-SAP-GCE
Image SLES15-SAP-GCE-BYOS
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15-ESPOS
SUSE Linux Enterprise High Performance Computing 15-LTSS
SUSE Linux Enterprise Live Patching 15
SUSE Linux Enterprise Server 15-LTSS
SUSE Linux Enterprise Server for SAP Applications 15
Ссылки
- Link for SUSE-SU-2021:0740-1
- E-Mail link for SUSE-SU-2021:0740-1
- SUSE Security Ratings
- SUSE Bug 1065600
- SUSE Bug 1163592
- SUSE Bug 1178401
- SUSE Bug 1178762
- SUSE Bug 1179014
- SUSE Bug 1179015
- SUSE Bug 1179045
- SUSE Bug 1179082
- SUSE Bug 1179428
- SUSE Bug 1179660
- SUSE Bug 1180058
- SUSE Bug 1181747
- SUSE Bug 1181753
- SUSE Bug 1181843
- SUSE Bug 1182140
- SUSE Bug 1182175
- SUSE CVE CVE-2020-29368 page
Описание
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
Затронутые продукты
Ссылки
- CVE-2020-29368
- SUSE Bug 1179428
- SUSE Bug 1179660
- SUSE Bug 1179664
Описание
An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access, aka CID-17839856fd58.
Затронутые продукты
Ссылки
- CVE-2020-29374
- SUSE Bug 1179428
- SUSE Bug 1179660
Описание
An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.
Затронутые продукты
Ссылки
- CVE-2021-26930
- SUSE Bug 1181843
- SUSE Bug 1182294
Описание
An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
Затронутые продукты
Ссылки
- CVE-2021-26931
- SUSE Bug 1181753
- SUSE Bug 1183022
Описание
An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then loops over the results, performing follow-up actions based on the success or failure of each operation. Unfortunately, when running in PV mode, the Linux backend drivers mishandle this: Some errors are ignored, effectively implying their success from the success of related batch elements. In other cases, errors resulting from one batch element lead to further batch elements not being inspected, and hence successful ones to not be possible to properly unmap upon error recovery. Only systems with Linux backends running in PV mode are vulnerable. Linux backends run in HVM / PVH modes are not vulnerable. This affects arch/*/xen/p2m.c and drivers/xen/gntdev.c.
Затронутые продукты
Ссылки
- CVE-2021-26932
- SUSE Bug 1181747