var-201906-1174
Vulnerability from variot
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363. Multiple TCP Selective Acknowledgement (SACK) and Maximum Segment Size (MSS) networking vulnerabilities may cause denial-of-service conditions in Linux and FreeBSD kernels. This vulnerability stems from improper management of system resources (such as memory, disk space, files, etc.) by network systems or products. A successful exploit could cause the targeted system to crash, resulting in a DoS condition. Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. Kernel.org has confirmed the vulnerability and released software updates.
Bug Fix(es):
-
update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1711010)
-
Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
CVE-2019-3846, CVE-2019-10126
huangwen reported multiple buffer overflows in the Marvell wifi
(mwifiex) driver, which a local user could use to cause denial of
service or the execution of arbitrary code.
CVE-2019-5489
Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari
Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh
discovered that local users could use the mincore() system call to
obtain sensitive information from other processes that access the
same memory-mapped file.
This update introduces a new sysctl value to control the minimal MSS
(net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-
coded value of 48. We recommend raising this to 536 unless you know
that your network requires a lower value.
CVE-2019-11486
Jann Horn of Google reported numerous race conditions in the
Siemens R3964 line discipline. This module has therefore been
disabled.
CVE-2019-11599
Jann Horn of Google reported a race condition in the core dump
implementation which could lead to a use-after-free.
CVE-2019-11815
It was discovered that a use-after-free in the Reliable Datagram
Sockets protocol could result in denial of service and potentially
privilege escalation. This protocol module (rds) is not auto-
loaded on Debian systems, so this issue only affects systems where
it is explicitly loaded.
CVE-2019-11833
It was discovered that the ext4 filesystem implementation writes
uninitialised data from kernel memory to new extent blocks. A
local user able to write to an ext4 filesystem and then read the
filesystem image, for example using a removable drive, might be
able to use this to obtain sensitive information.
CVE-2019-11884
It was discovered that the Bluetooth HIDP implementation did not
ensure that new connection names were null-terminated. A local
user with CAP_NET_ADMIN capability might be able to use this to
obtain sensitive information from the kernel stack.
For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE-----
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Bug Fix(es):
-
[HPE 8.0 Bug] nvme drive power button does not turn off drive (BZ#1700288)
-
RHEL8.0 - hw csum failure seen in dmesg and console (using mlx5/mlx4/Mellanox) (BZ#1700289)
-
RHEL8.0 - vfio-ap: add subsystem to matrix device to avoid libudev failures (kvm) (BZ#1700290)
-
[FJ8.1 Bug]: Make Fujitsu Erratum 010001 patch work on A64FX v1r0 (BZ#1700901)
-
[FJ8.0 Bug]: Fujitsu A64FX processor errata - panic by unknown fault (BZ#1700902)
-
RHEL 8.0 Snapshot 4 - nvme create-ns command hangs after creating 20 namespaces on Bolt (NVMe) (BZ#1701140)
-
[Cavium/Marvell 8.0 qed] Fix qed_mcp_halt() and qed_mcp_resume() (backporting bug) (BZ#1704184)
-
[Intel 8.1 Bug] PBF: Base frequency display fix (BZ#1706739)
-
[RHEL8]read/write operation not permitted to /sys/kernel/debug/gcov/reset (BZ#1708100)
-
RHEL8.0 - ISST-LTE:pVM:fleetwood:LPM:raylp85:After lpm seeing the console logs on the the lpar at target side (BZ#1708102)
-
RHEL8.0 - Backport support for software count cache flush Spectre v2 mitigation (BZ#1708112)
-
[Regression] RHEL8.0 - System crashed with one stress-ng-mremap stressor on Boston (kvm host) (BZ#1708617)
-
[intel ice Rhel 8 RC1] ethtool -A ethx causes interfaces to go down (BZ#1709433)
-
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2019:1485-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1485 Issue date: 2019-06-17 CVE Names: CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary:
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat Enterprise Linux Server AUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server E4S (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.2) - noarch, x86_64
- Description:
The kernel packages contain the Linux kernel, the core of any Linux operating system. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)
-
Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)
-
Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)
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):
-
THP: Race between MADV_DONTNEED and NUMA hinting node migration code (BZ#1698103)
-
[RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712989)
-
[RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712994)
-
WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713000)
-
Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
- Bugs fixed (https://bugzilla.redhat.com/):
1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service 1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service 1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service
- Package List:
Red Hat Enterprise Linux Server AUS (v. 7.2):
Source: kernel-3.10.0-327.79.2.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm kernel-doc-3.10.0-327.79.2.el7.noarch.rpm
x86_64: kernel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-headers-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm perf-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.2):
Source: kernel-3.10.0-327.79.2.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm kernel-doc-3.10.0-327.79.2.el7.noarch.rpm
x86_64: kernel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-headers-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm perf-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm
Red Hat Enterprise Linux Server TUS (v. 7.2):
Source: kernel-3.10.0-327.79.2.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm kernel-doc-3.10.0-327.79.2.el7.noarch.rpm
x86_64: kernel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-devel-3.10.0-327.79.2.el7.x86_64.rpm kernel-headers-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm perf-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 7.2):
x86_64: kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional E4S (v. 7.2):
x86_64: kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional TUS (v. 7.2):
x86_64: kernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- References:
https://access.redhat.com/security/cve/CVE-2019-11477 https://access.redhat.com/security/cve/CVE-2019-11478 https://access.redhat.com/security/cve/CVE-2019-11479 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/tcpsack
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2019 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 7) - aarch64, noarch, ppc64le
- ========================================================================== Ubuntu Security Notice USN-4041-2 June 29, 2019
linux-lts-xenial, linux-aws, linux-azure update
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in the Linux kernel. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SO_SNDBUF values. This update fixes the problem.
We apologize for the inconvenience. (CVE-2019-11479)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 14.04 ESM: linux-image-4.15.0-1049-azure 4.15.0-1049.54~14.04.1 linux-image-4.4.0-1048-aws 4.4.0-1048.52 linux-image-4.4.0-154-generic 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-generic-lpae 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-lowlatency 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc-e500mc 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc-smp 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc64-emb 4.4.0-154.181~14.04.1 linux-image-4.4.0-154-powerpc64-smp 4.4.0-154.181~14.04.1 linux-image-aws 4.4.0.1048.49 linux-image-azure 4.15.0.1049.36 linux-image-generic-lpae-lts-xenial 4.4.0.154.135 linux-image-generic-lts-xenial 4.4.0.154.135 linux-image-lowlatency-lts-xenial 4.4.0.154.135 linux-image-powerpc-e500mc-lts-xenial 4.4.0.154.135 linux-image-powerpc-smp-lts-xenial 4.4.0.154.135 linux-image-powerpc64-emb-lts-xenial 4.4.0.154.135 linux-image-powerpc64-smp-lts-xenial 4.4.0.154.135 linux-image-virtual-lts-xenial 4.4.0.154.135
After a standard system update you need to reboot your computer to make all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. The most serious, dubbed “SACK Panic,” allows a remotely-triggered kernel panic on recent Linux kernels.
There are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective. We recommend that affected parties enact one of those described below, based on their environment.
Details:
1: CVE-2019-11477: SACK Panic (Linux >= 2.6.29)
Description: A sequence of SACKs may be crafted such that one can trigger an integer overflow, leading to a kernel panic.
Fix: Apply the patch PATCH_net_1_4.patch. Additionally, versions of the Linux kernel up to, and including, 4.14 require a second patch PATCH_net_1a.patch.
Workaround #1: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing sysctl is set to 0, which appears to be the default value for that sysctl).
Workaround #2: Disable SACK processing (/proc/sys/net/ipv4/tcp_sack set to 0).
(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)
2: CVE-2019-11478: SACK Slowness (Linux < 4.15) or Excess Resource Usage (all Linux versions)
Description: It is possible to send a crafted sequence of SACKs which will fragment the TCP retransmission queue. On Linux kernels prior to 4.15, an attacker may be able to further exploit the fragmented queue to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection.
Fix: Apply the patch PATCH_net_2_4.patch
Workaround #1: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing sysctl is set to 0, which appears to be the default value for that sysctl).
Workaround #2: Disable SACK processing (/proc/sys/net/ipv4/tcp_sack set to 0).
(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)
3: CVE-2019-5599: SACK Slowness (FreeBSD 12 using the RACK TCP Stack)
Description: It is possible to send a crafted sequence of SACKs which will fragment the RACK send map. An attacker may be able to further exploit the fragmented send map to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection.
Workaround #1: Apply the patch split_limit.patch and set the net.inet.tcp.rack.split_limit sysctl to a reasonable value to limit the size of the SACK table.
Workaround #2: Temporarily disable the RACK TCP stack.
(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)
4: CVE-2019-11479: Excess Resource Consumption Due to Low MSS Values (all Linux versions)
Description: An attacker can force the Linux kernel to segment its responses into multiple TCP segments, each of which contains only 8 bytes of data. This drastically increases the bandwidth required to deliver the same amount of data. Further, it consumes additional resources (CPU and NIC processing power). This attack requires continued effort from the attacker and the impacts will end shortly after the attacker stops sending traffic.
Fix: Two patches PATCH_net_3_4.patch and PATCH_net_4_4.patch add a sysctl which enforces a minimum MSS, set by the net.ipv4.tcp_min_snd_mss sysctl. This lets an administrator enforce a minimum MSS appropriate for their applications.
Workaround: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing sysctl is set to 0, which appears to be the default value for that sysctl).
Note:
Good system and application coding and configuration practices (limiting write buffers to the necessary level, monitoring connection memory consumption via SO_MEMINFO, and aggressively closing misbehaving connections) can help to limit the impact of attacks against these kinds of vulnerabilities.
Acknowledgments:
Originally reported by Jonathan Looney.
We thank Eric Dumazet for providing Linux fixes and support.
We thank Bruce Curtis for providing the Linux filters.
We thank Jonathan Lemon and Alexey Kodanev for helping to improve the Linux patches.
We gratefully acknowledge the assistance of Tyler Hicks in testing fixes, refining the information about vulnerable versions, and providing assistance during the disclosure process. 6.6) - x86_64
Bug Fix(es):
-
MDS mitigations not enabled on Intel Skylake CPUs (BZ#1713026)
-
[RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1713029)
-
RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1713044)
4
Show details on source website{
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"data": "Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363. Multiple TCP Selective Acknowledgement (SACK) and Maximum Segment Size (MSS) networking vulnerabilities may cause denial-of-service conditions in Linux and FreeBSD kernels. This vulnerability stems from improper management of system resources (such as memory, disk space, files, etc.) by network systems or products. A successful exploit could cause the targeted system to crash, resulting in a DoS condition. \nProof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. \nKernel.org has confirmed the vulnerability and released software updates. \n\nBug Fix(es):\n\n* update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1711010)\n\n4. Description:\n\nThe kernel-rt packages provide the Real Time Linux Kernel, which enables\nfine-tuning for systems with extremely high determinism requirements. \n\nCVE-2019-3846, CVE-2019-10126\n\n huangwen reported multiple buffer overflows in the Marvell wifi\n (mwifiex) driver, which a local user could use to cause denial of\n service or the execution of arbitrary code. \n\nCVE-2019-5489\n\n Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari\n Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh\n discovered that local users could use the mincore() system call to\n obtain sensitive information from other processes that access the\n same memory-mapped file. \n\n This update introduces a new sysctl value to control the minimal MSS\n (net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-\n coded value of 48. We recommend raising this to 536 unless you know\n that your network requires a lower value. \n\nCVE-2019-11486\n\n Jann Horn of Google reported numerous race conditions in the\n Siemens R3964 line discipline. This module has therefore been\n disabled. \n\nCVE-2019-11599\n\n Jann Horn of Google reported a race condition in the core dump\n implementation which could lead to a use-after-free. \n\nCVE-2019-11815\n\n It was discovered that a use-after-free in the Reliable Datagram\n Sockets protocol could result in denial of service and potentially\n privilege escalation. This protocol module (rds) is not auto-\n loaded on Debian systems, so this issue only affects systems where\n it is explicitly loaded. \n\nCVE-2019-11833\n\n It was discovered that the ext4 filesystem implementation writes\n uninitialised data from kernel memory to new extent blocks. A\n local user able to write to an ext4 filesystem and then read the\n filesystem image, for example using a removable drive, might be\n able to use this to obtain sensitive information. \n\nCVE-2019-11884\n\n It was discovered that the Bluetooth HIDP implementation did not\n ensure that new connection names were null-terminated. A local\n user with CAP_NET_ADMIN capability might be able to use this to\n obtain sensitive information from the kernel stack. \n\nFor the detailed security status of linux please refer to its security\ntracker page at:\nhttps://security-tracker.debian.org/tracker/linux\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n-----BEGIN PGP SIGNATURE-----\n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\nNwCQrSCaGk2nwBZr6Xs0qYVTsLLY9jkg8FUWPdH4ZEOFcGaWi3A=dgfy\n-----END PGP SIGNATURE-----\n. 8) - aarch64, noarch, ppc64le, s390x, x86_64\n\n3. \n\nBug Fix(es):\n\n* [HPE 8.0 Bug] nvme drive power button does not turn off drive\n(BZ#1700288)\n\n* RHEL8.0 - hw csum failure seen in dmesg and console (using\nmlx5/mlx4/Mellanox) (BZ#1700289)\n\n* RHEL8.0 - vfio-ap: add subsystem to matrix device to avoid libudev\nfailures (kvm) (BZ#1700290)\n\n* [FJ8.1 Bug]: Make Fujitsu Erratum 010001 patch work on A64FX v1r0\n(BZ#1700901)\n\n* [FJ8.0 Bug]: Fujitsu A64FX processor errata - panic by unknown fault\n(BZ#1700902)\n\n* RHEL 8.0 Snapshot 4 - nvme create-ns command hangs after creating 20\nnamespaces on Bolt (NVMe) (BZ#1701140)\n\n* [Cavium/Marvell 8.0 qed] Fix qed_mcp_halt() and qed_mcp_resume()\n(backporting bug) (BZ#1704184)\n\n* [Intel 8.1 Bug] PBF: Base frequency display fix (BZ#1706739)\n\n* [RHEL8]read/write operation not permitted to /sys/kernel/debug/gcov/reset\n(BZ#1708100)\n\n* RHEL8.0 - ISST-LTE:pVM:fleetwood:LPM:raylp85:After lpm seeing the\nconsole logs on the the lpar at target side (BZ#1708102)\n\n* RHEL8.0 - Backport support for software count cache flush Spectre v2\nmitigation (BZ#1708112)\n\n* [Regression] RHEL8.0 - System crashed with one stress-ng-mremap stressor\non Boston (kvm host) (BZ#1708617)\n\n* [intel ice Rhel 8 RC1] ethtool -A ethx causes interfaces to go down\n(BZ#1709433)\n\n4. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Important: kernel security and bug fix update\nAdvisory ID: RHSA-2019:1485-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2019:1485\nIssue date: 2019-06-17\nCVE Names: CVE-2019-11477 CVE-2019-11478 CVE-2019-11479\n====================================================================\n1. Summary:\n\nAn update for kernel is now available for Red Hat Enterprise Linux 7.2\nAdvanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update\nSupport, and Red Hat Enterprise Linux 7.2 Update Services for SAP\nSolutions. \n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Server AUS (v. 7.2) - noarch, x86_64\nRed Hat Enterprise Linux Server E4S (v. 7.2) - noarch, x86_64\nRed Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64\nRed Hat Enterprise Linux Server Optional E4S (v. 7.2) - x86_64\nRed Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64\nRed Hat Enterprise Linux Server TUS (v. 7.2) - noarch, x86_64\n\n3. Description:\n\nThe kernel packages contain the Linux kernel, the core of any Linux\noperating system. While processing SACK segments, the Linux kernel\u0027s socket buffer\n(SKB) data structure becomes fragmented. To efficiently process SACK blocks, the Linux\nkernel merges multiple fragmented SKBs into one, potentially overflowing\nthe variable holding the number of segments. A remote attacker could use\nthis flaw to crash the Linux kernel by sending a crafted sequence of SACK\nsegments on a TCP connection with small value of TCP MSS, resulting in a\ndenial of service (DoS). (CVE-2019-11477)\n\n* Kernel: tcp: excessive resource consumption while processing SACK blocks\nallows remote denial of service (CVE-2019-11478)\n\n* Kernel: tcp: excessive resource consumption for TCP connections with low\nMSS allows remote denial of service (CVE-2019-11479)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nBug Fix(es):\n\n* THP: Race between MADV_DONTNEED and NUMA hinting node migration code\n(BZ#1698103)\n\n* [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update\n(BZ#1712989)\n\n* [RHEL7] MDS mitigations are not enabled after double microcode update\n(BZ#1712994)\n\n* WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90\n__static_key_slow_dec+0xa6/0xb0 (BZ#1713000)\n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect. \n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service\n1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service\n1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service\n\n6. Package List:\n\nRed Hat Enterprise Linux Server AUS (v. 7.2):\n\nSource:\nkernel-3.10.0-327.79.2.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm\nkernel-doc-3.10.0-327.79.2.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-devel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-headers-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm\nperf-3.10.0-327.79.2.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server E4S (v. 7.2):\n\nSource:\nkernel-3.10.0-327.79.2.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm\nkernel-doc-3.10.0-327.79.2.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-devel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-headers-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm\nperf-3.10.0-327.79.2.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server TUS (v. 7.2):\n\nSource:\nkernel-3.10.0-327.79.2.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.79.2.el7.noarch.rpm\nkernel-doc-3.10.0-327.79.2.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-devel-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-headers-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.79.2.el7.x86_64.rpm\nperf-3.10.0-327.79.2.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional AUS (v. 7.2):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional E4S (v. 7.2):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional TUS (v. 7.2):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.79.2.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.79.2.el7.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2019-11477\nhttps://access.redhat.com/security/cve/CVE-2019-11478\nhttps://access.redhat.com/security/cve/CVE-2019-11479\nhttps://access.redhat.com/security/updates/classification/#important\nhttps://access.redhat.com/security/vulnerabilities/tcpsack\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2019 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\nnLvixkiNDOA=rUVR\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. 7) - aarch64, noarch, ppc64le\n\n3. ==========================================================================\nUbuntu Security Notice USN-4041-2\nJune 29, 2019\n\nlinux-lts-xenial, linux-aws, linux-azure update\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 14.04 ESM\n\nSummary:\n\nSeveral security issues were fixed in the Linux kernel. Unfortunately,\nthe update introduced a regression that interfered with networking\napplications that setup very low SO_SNDBUF values. This update fixes\nthe problem. \n\nWe apologize for the inconvenience. \n(CVE-2019-11479)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 14.04 ESM:\n linux-image-4.15.0-1049-azure 4.15.0-1049.54~14.04.1\n linux-image-4.4.0-1048-aws 4.4.0-1048.52\n linux-image-4.4.0-154-generic 4.4.0-154.181~14.04.1\n linux-image-4.4.0-154-generic-lpae 4.4.0-154.181~14.04.1\n linux-image-4.4.0-154-lowlatency 4.4.0-154.181~14.04.1\n linux-image-4.4.0-154-powerpc-e500mc 4.4.0-154.181~14.04.1\n linux-image-4.4.0-154-powerpc-smp 4.4.0-154.181~14.04.1\n linux-image-4.4.0-154-powerpc64-emb 4.4.0-154.181~14.04.1\n linux-image-4.4.0-154-powerpc64-smp 4.4.0-154.181~14.04.1\n linux-image-aws 4.4.0.1048.49\n linux-image-azure 4.15.0.1049.36\n linux-image-generic-lpae-lts-xenial 4.4.0.154.135\n linux-image-generic-lts-xenial 4.4.0.154.135\n linux-image-lowlatency-lts-xenial 4.4.0.154.135\n linux-image-powerpc-e500mc-lts-xenial 4.4.0.154.135\n linux-image-powerpc-smp-lts-xenial 4.4.0.154.135\n linux-image-powerpc64-emb-lts-xenial 4.4.0.154.135\n linux-image-powerpc64-smp-lts-xenial 4.4.0.154.135\n linux-image-virtual-lts-xenial 4.4.0.154.135\n\nAfter a standard system update you need to reboot your computer to make\nall the necessary changes. \n\nATTENTION: Due to an unavoidable ABI change the kernel updates have\nbeen given a new version number, which requires you to recompile and\nreinstall all third party kernel modules you might have installed. \nUnless you manually uninstalled the standard kernel metapackages\n(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,\nlinux-powerpc), a standard system upgrade will automatically perform\nthis as well. The most serious, dubbed _\u201cSACK Panic_,\u201d allows a remotely-triggered kernel panic on recent Linux kernels. \n\nThere are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective. We recommend that affected parties enact one of those described below, based on their environment. \n\n### Details:\n\n#### 1: [CVE-2019-11477](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11477): SACK Panic (Linux \u003e= 2.6.29)\n\n__Description:__\nA sequence of SACKs may be crafted such that one can trigger an integer overflow, leading to a kernel panic. \n\n__Fix:__ Apply the patch [PATCH_net_1_4.patch](2019-001/PATCH_net_1_4.patch). Additionally, versions of the Linux kernel up to, and including, 4.14 require a second patch [PATCH_net_1a.patch](2019-001/PATCH_net_1a.patch). \n\n__Workaround #1:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n__Workaround #2:__ Disable SACK processing (`/proc/sys/net/ipv4/tcp_sack` set to 0). \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 2: [CVE-2019-11478](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478): SACK Slowness (Linux \u003c 4.15) or Excess Resource Usage (all Linux versions)\n\n__Description:__ It is possible to send a crafted sequence of SACKs which will fragment the TCP retransmission queue. On Linux kernels prior to 4.15, an attacker may be able to further exploit the fragmented queue to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection. \n\n__Fix:__ Apply the patch [PATCH_net_2_4.patch](2019-001/PATCH_net_2_4.patch)\n\n__Workaround #1:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n__Workaround #2:__ Disable SACK processing (`/proc/sys/net/ipv4/tcp_sack` set to 0). \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 3: [CVE-2019-5599](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5599): SACK Slowness (FreeBSD 12 using the RACK TCP Stack)\n\n__Description:__ It is possible to send a crafted sequence of SACKs which will fragment the RACK send map. An attacker may be able to further exploit the fragmented send map to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection. \n\n__Workaround #1:__ Apply the patch [split_limit.patch](2019-001/split_limit.patch) and set the `net.inet.tcp.rack.split_limit` sysctl to a reasonable value to limit the size of the SACK table. \n\n__Workaround #2:__ Temporarily disable the RACK TCP stack. \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 4: [CVE-2019-11479](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11479): Excess Resource Consumption Due to Low MSS Values (all Linux versions)\n\n__Description:__ An attacker can force the Linux kernel to segment its responses into multiple TCP segments, each of which contains only 8 bytes of data. This drastically increases the bandwidth required to deliver the same amount of data. Further, it consumes additional resources (CPU and NIC processing power). This attack requires continued effort from the attacker and the impacts will end shortly after the attacker stops sending traffic. \n\n__Fix:__ Two patches [PATCH_net_3_4.patch](2019-001/PATCH_net_3_4.patch) and [PATCH_net_4_4.patch](2019-001/PATCH_net_4_4.patch) add a sysctl which enforces a minimum MSS, set by the `net.ipv4.tcp_min_snd_mss` sysctl. This lets an administrator enforce a minimum MSS appropriate for their applications. \n\n__Workaround:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n\n### Note:\nGood system and application coding and configuration practices (limiting write buffers to the necessary level, monitoring connection memory consumption via SO_MEMINFO, and aggressively closing misbehaving connections) can help to limit the impact of attacks against these kinds of vulnerabilities. \n\n\n## Acknowledgments:\nOriginally reported by Jonathan Looney. \n\nWe thank Eric Dumazet for providing Linux fixes and support. \n\nWe thank Bruce Curtis for providing the Linux filters. \n\nWe thank Jonathan Lemon and Alexey Kodanev for helping to improve the Linux patches. \n\nWe gratefully acknowledge the assistance of Tyler Hicks in testing fixes, refining the information about vulnerable versions, and providing assistance during the disclosure process. 6.6) - x86_64\n\n3. \n\nBug Fix(es):\n\n* MDS mitigations not enabled on Intel Skylake CPUs (BZ#1713026)\n\n* [RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1713029)\n\n* RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1713044)\n\n4",
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