VAR-201906-1176
Vulnerability from variot - Updated: 2025-12-22 20:16Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 commit f070ef2ac66716357066b683fb0baf55f8191a2e. Linux Kernel Contains a resource exhaustion vulnerability.Service operation interruption (DoS) There is a possibility of being put into a state. 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. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel security, bug fix, and enhancement update Advisory ID: RHSA-2019:1483-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1483 Issue date: 2019-06-17 CVE Names: CVE-2018-7566 CVE-2018-1000004 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary:
An update for kernel is now available for Red Hat Enterprise Linux 7.4 Extended Update Support.
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 ComputeNode EUS (v. 7.4) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, 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: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566)
-
kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004)
-
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):
-
Mistmach between 'tty->termios->c_lflag' and 'ldata->icanon' for 'ICANON' (BZ#1708061)
-
RHEL7: rwsem reader/writer mutual exclusion guarantee may not work (BZ#1709702)
-
hardened usercopy is causing crash (BZ#1712311)
-
[RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712991)
-
[RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712996)
-
WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713002)
-
[debug kernel] [x86_64]INFO: possible circular locking dependency detected (BZ#1715326)
-
RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)
Enhancement(s):
-
[MCHP 7.7 FEAT] Update smartpqi driver to latest upstream (BZ#1709467)
-
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/):
1535315 - CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service 1550142 - CVE-2018-7566 kernel: race condition in snd_seq_write() may lead to UAF or OOB-access 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 ComputeNode EUS (v. 7.4):
Source: kernel-3.10.0-693.50.3.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-693.50.3.el7.noarch.rpm kernel-doc-3.10.0-693.50.3.el7.noarch.rpm
x86_64: kernel-3.10.0-693.50.3.el7.x86_64.rpm kernel-debug-3.10.0-693.50.3.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.50.3.el7.x86_64.rpm kernel-devel-3.10.0-693.50.3.el7.x86_64.rpm kernel-headers-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.50.3.el7.x86_64.rpm perf-3.10.0-693.50.3.el7.x86_64.rpm perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm python-perf-3.10.0-693.50.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):
x86_64: kernel-debug-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.50.3.el7.x86_64.rpm perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.4):
Source: kernel-3.10.0-693.50.3.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-693.50.3.el7.noarch.rpm kernel-doc-3.10.0-693.50.3.el7.noarch.rpm
ppc64: kernel-3.10.0-693.50.3.el7.ppc64.rpm kernel-bootwrapper-3.10.0-693.50.3.el7.ppc64.rpm kernel-debug-3.10.0-693.50.3.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm kernel-debug-devel-3.10.0-693.50.3.el7.ppc64.rpm kernel-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-693.50.3.el7.ppc64.rpm kernel-devel-3.10.0-693.50.3.el7.ppc64.rpm kernel-headers-3.10.0-693.50.3.el7.ppc64.rpm kernel-tools-3.10.0-693.50.3.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm kernel-tools-libs-3.10.0-693.50.3.el7.ppc64.rpm perf-3.10.0-693.50.3.el7.ppc64.rpm perf-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm python-perf-3.10.0-693.50.3.el7.ppc64.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm
ppc64le: kernel-3.10.0-693.50.3.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debug-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-693.50.3.el7.ppc64le.rpm kernel-devel-3.10.0-693.50.3.el7.ppc64le.rpm kernel-headers-3.10.0-693.50.3.el7.ppc64le.rpm kernel-tools-3.10.0-693.50.3.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm kernel-tools-libs-3.10.0-693.50.3.el7.ppc64le.rpm perf-3.10.0-693.50.3.el7.ppc64le.rpm perf-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm python-perf-3.10.0-693.50.3.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm
s390x: kernel-3.10.0-693.50.3.el7.s390x.rpm kernel-debug-3.10.0-693.50.3.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-693.50.3.el7.s390x.rpm kernel-debug-devel-3.10.0-693.50.3.el7.s390x.rpm kernel-debuginfo-3.10.0-693.50.3.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-693.50.3.el7.s390x.rpm kernel-devel-3.10.0-693.50.3.el7.s390x.rpm kernel-headers-3.10.0-693.50.3.el7.s390x.rpm kernel-kdump-3.10.0-693.50.3.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-693.50.3.el7.s390x.rpm kernel-kdump-devel-3.10.0-693.50.3.el7.s390x.rpm perf-3.10.0-693.50.3.el7.s390x.rpm perf-debuginfo-3.10.0-693.50.3.el7.s390x.rpm python-perf-3.10.0-693.50.3.el7.s390x.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.s390x.rpm
x86_64: kernel-3.10.0-693.50.3.el7.x86_64.rpm kernel-debug-3.10.0-693.50.3.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.50.3.el7.x86_64.rpm kernel-devel-3.10.0-693.50.3.el7.x86_64.rpm kernel-headers-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.50.3.el7.x86_64.rpm perf-3.10.0-693.50.3.el7.x86_64.rpm perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm python-perf-3.10.0-693.50.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.4):
ppc64: kernel-debug-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm kernel-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-693.50.3.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-693.50.3.el7.ppc64.rpm perf-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm
ppc64le: kernel-debug-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debug-devel-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-693.50.3.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-693.50.3.el7.ppc64le.rpm perf-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-693.50.3.el7.ppc64le.rpm
x86_64: kernel-debug-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.50.3.el7.x86_64.rpm perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.50.3.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-2018-7566 https://access.redhat.com/security/cve/CVE-2018-1000004 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 . ========================================================================== Kernel Live Patch Security Notice 0052-1 June 18, 2019
linux vulnerability
A security issue affects these releases of Ubuntu:
| Series | Base kernel | Arch | flavors | |------------------+--------------+----------+------------------| | Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic | | Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency | | Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic | | Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency |
Summary:
Several security issues were fixed in the kernel. (CVE-2019-11478)
Update instructions:
The problem can be corrected by updating your livepatches to the following versions:
| Kernel | Version | flavors | |--------------------------+----------+--------------------------| | 4.4.0-148.174 | 52.3 | generic, lowlatency | | 4.4.0-150.176 | 52.3 | generic, lowlatency | | 4.15.0-50.54 | 52.3 | generic, lowlatency | | 4.15.0-50.54~16.04.1 | 52.3 | generic, lowlatency | | 4.15.0-51.55 | 52.3 | generic, lowlatency | | 4.15.0-51.55~16.04.1 | 52.3 | generic, lowlatency |
References: CVE-2019-11477, CVE-2019-11478
-- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce . Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Bug Fix(es):
-
kernel-rt: update to the RHEL8.0.z batch#1 source tree (BZ#1704955)
-
These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.
The following packages have been upgraded to a later upstream version: redhat-release-virtualization-host (4.3.4), redhat-virtualization-host (4.3.4). # Advisory
ID: NFLX-2019-001
Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities
Release Date: 2019-06-17
Severity: Critical
Overview:
Netflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels.
The vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. 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
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"data": "Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 commit f070ef2ac66716357066b683fb0baf55f8191a2e. Linux Kernel Contains a resource exhaustion vulnerability.Service operation interruption (DoS) There is a possibility of being put into a state. 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. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Important: kernel security, bug fix, and enhancement update\nAdvisory ID: RHSA-2019:1483-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2019:1483\nIssue date: 2019-06-17\nCVE Names: CVE-2018-7566 CVE-2018-1000004 CVE-2019-11477\n CVE-2019-11478 CVE-2019-11479\n====================================================================\n1. Summary:\n\nAn update for kernel is now available for Red Hat Enterprise Linux 7.4\nExtended Update Support. \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 ComputeNode EUS (v. 7.4) - noarch, x86_64\nRed Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64\nRed Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, 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: race condition in snd_seq_write() may lead to UAF or OOB-access\n(CVE-2018-7566)\n\n* kernel: Race condition in sound system can lead to denial of service\n(CVE-2018-1000004)\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* Mistmach between \u0027tty-\u003etermios-\u003ec_lflag\u0027 and \u0027ldata-\u003eicanon\u0027 for \u0027ICANON\u0027\n(BZ#1708061)\n\n* RHEL7: rwsem reader/writer mutual exclusion guarantee may not work\n(BZ#1709702)\n\n* hardened usercopy is causing crash (BZ#1712311)\n\n* [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update\n(BZ#1712991)\n\n* [RHEL7] MDS mitigations are not enabled after double microcode update\n(BZ#1712996)\n\n* WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90\n__static_key_slow_dec+0xa6/0xb0 (BZ#1713002)\n\n* [debug kernel] [x86_64]INFO: possible circular locking dependency\ndetected (BZ#1715326)\n\n* RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)\n\nEnhancement(s):\n\n* [MCHP 7.7 FEAT] Update smartpqi driver to latest upstream (BZ#1709467)\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\n1535315 - CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service\n1550142 - CVE-2018-7566 kernel: race condition in snd_seq_write() may lead to UAF or OOB-access\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 ComputeNode EUS (v. 7.4):\n\nSource:\nkernel-3.10.0-693.50.3.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-693.50.3.el7.noarch.rpm\nkernel-doc-3.10.0-693.50.3.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debug-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-devel-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-headers-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-tools-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-693.50.3.el7.x86_64.rpm\nperf-3.10.0-693.50.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\npython-perf-3.10.0-693.50.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-693.50.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-693.50.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server EUS (v. 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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-2018-7566\nhttps://access.redhat.com/security/cve/CVE-2018-1000004\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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\nLbgoNJu99kM=aVva\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. ==========================================================================\nKernel Live Patch Security Notice 0052-1\nJune 18, 2019\n\nlinux vulnerability\n==========================================================================\n\nA security issue affects these releases of Ubuntu:\n\n| Series | Base kernel | Arch | flavors |\n|------------------+--------------+----------+------------------|\n| Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic |\n| Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency |\n| Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic |\n| Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency |\n\nSummary:\n\nSeveral security issues were fixed in the kernel. (CVE-2019-11478)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your livepatches to the following\nversions:\n\n| Kernel | Version | flavors |\n|--------------------------+----------+--------------------------|\n| 4.4.0-148.174 | 52.3 | generic, lowlatency |\n| 4.4.0-150.176 | 52.3 | generic, lowlatency |\n| 4.15.0-50.54 | 52.3 | generic, lowlatency |\n| 4.15.0-50.54~16.04.1 | 52.3 | generic, lowlatency |\n| 4.15.0-51.55 | 52.3 | generic, lowlatency |\n| 4.15.0-51.55~16.04.1 | 52.3 | generic, lowlatency |\n\nReferences:\n CVE-2019-11477, CVE-2019-11478\n\n\n-- \nubuntu-security-announce mailing list\nubuntu-security-announce@lists.ubuntu.com\nModify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce\n. Description:\n\nThe kernel-rt packages provide the Real Time Linux Kernel, which enables\nfine-tuning for systems with extremely high determinism requirements. \n\nBug Fix(es):\n\n* kernel-rt: update to the RHEL8.0.z batch#1 source tree (BZ#1704955)\n\n4. These packages include redhat-release-virtualization-host,\novirt-node, and rhev-hypervisor. RHVH features a Cockpit user\ninterface for monitoring the host\u0027s resources and performing administrative\ntasks. \n\nThe following packages have been upgraded to a later upstream version:\nredhat-release-virtualization-host (4.3.4), redhat-virtualization-host\n(4.3.4). # Advisory\n###### ID: NFLX-2019-001\n\n###### Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities\n\n###### Release Date: 2019-06-17\n\n###### Severity: Critical\n\n### Overview:\n\nNetflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels. \n\nThe vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. 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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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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