Linux Kernel Security Updates for Arch Linux
Posted on: 08/09/2018 06:51 AM

The following Linux Kernel security updates are available for Arch Linux:

ASA-201808-4: linux: denial of service
ASA-201808-5: linux-lts: denial of service
ASA-201808-6: linux-zen: denial of service
ASA-201808-7: linux-hardened: denial of service

ASA-201808-4: linux: denial of service

Arch Linux Security Advisory ASA-201808-4
=========================================

Severity: High
Date : 2018-08-08
CVE-ID : CVE-2018-5390
Package : linux
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-747

Summary
=======

The package linux before version 4.17.11-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 4.17.11-1.

# pacman -Syu "linux>=4.17.11-1"

The problem has been fixed upstream in version 4.17.11.

Workaround
==========

None.

Description
===========

A flaw named SegmentSmack was found in the way the Linux kernel handled
specially crafted TCP packets. A remote attacker could use this flaw to
trigger time and calculation expensive calls to
tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending
specially modified packets within ongoing TCP sessions which could lead
to a CPU saturation and hence a denial of service on the system.
Maintaining the denial of service condition requires continuous two-way
TCP sessions to a reachable open port, thus the attacks cannot be
performed using spoofed IP addresses.

Impact
======

A remote attacker is able to saturate the CPU and hence cause a denial
of service on the host system by sending specially modified packets
within ongoing TCP sessions.

References
==========

https://www.kb.cert.org/vuls/id/962459
https://www.spinics.net/lists/netdev/msg514742.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=72cd43ba64fc172a443410ce01645895850844c8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f4a3313d8e2ca9fd8d8f45e40a2903ba782607e7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d4bf93ac12003f9b8e1e2de37fe27983deebdcf
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8541b21e781a22dce52a74fef0b9bed00404a1cd
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=58152ecbbcc6a0ce7fddd5bf5f6ee535834ece0c
https://security.archlinux.org/CVE-2018-5390


ASA-201808-5: linux-lts: denial of service

Arch Linux Security Advisory ASA-201808-5
=========================================

Severity: High
Date : 2018-08-08
CVE-ID : CVE-2018-5390
Package : linux-lts
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-748

Summary
=======

The package linux-lts before version 4.14.59-1 is vulnerable to denial
of service.

Resolution
==========

Upgrade to 4.14.59-1.

# pacman -Syu "linux-lts>=4.14.59-1"

The problem has been fixed upstream in version 4.14.59.

Workaround
==========

None.

Description
===========

A flaw named SegmentSmack was found in the way the Linux kernel handled
specially crafted TCP packets. A remote attacker could use this flaw to
trigger time and calculation expensive calls to
tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending
specially modified packets within ongoing TCP sessions which could lead
to a CPU saturation and hence a denial of service on the system.
Maintaining the denial of service condition requires continuous two-way
TCP sessions to a reachable open port, thus the attacks cannot be
performed using spoofed IP addresses.

Impact
======

A remote attacker is able to saturate the CPU and hence cause a denial
of service on the host system by sending specially modified packets
within ongoing TCP sessions.

References
==========

https://www.kb.cert.org/vuls/id/962459
https://www.spinics.net/lists/netdev/msg514742.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=72cd43ba64fc172a443410ce01645895850844c8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f4a3313d8e2ca9fd8d8f45e40a2903ba782607e7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d4bf93ac12003f9b8e1e2de37fe27983deebdcf
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8541b21e781a22dce52a74fef0b9bed00404a1cd
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=58152ecbbcc6a0ce7fddd5bf5f6ee535834ece0c
https://security.archlinux.org/CVE-2018-5390


ASA-201808-6: linux-zen: denial of service

Arch Linux Security Advisory ASA-201808-6
=========================================

Severity: High
Date : 2018-08-08
CVE-ID : CVE-2018-5390
Package : linux-zen
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-749

Summary
=======

The package linux-zen before version 4.17.11-1 is vulnerable to denial
of service.

Resolution
==========

Upgrade to 4.17.11-1.

# pacman -Syu "linux-zen>=4.17.11-1"

The problem has been fixed upstream in version 4.17.11.

Workaround
==========

None.

Description
===========

A flaw named SegmentSmack was found in the way the Linux kernel handled
specially crafted TCP packets. A remote attacker could use this flaw to
trigger time and calculation expensive calls to
tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending
specially modified packets within ongoing TCP sessions which could lead
to a CPU saturation and hence a denial of service on the system.
Maintaining the denial of service condition requires continuous two-way
TCP sessions to a reachable open port, thus the attacks cannot be
performed using spoofed IP addresses.

Impact
======

A remote attacker is able to saturate the CPU and hence cause a denial
of service on the host system by sending specially modified packets
within ongoing TCP sessions.

References
==========

https://www.kb.cert.org/vuls/id/962459
https://www.spinics.net/lists/netdev/msg514742.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=72cd43ba64fc172a443410ce01645895850844c8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f4a3313d8e2ca9fd8d8f45e40a2903ba782607e7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d4bf93ac12003f9b8e1e2de37fe27983deebdcf
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8541b21e781a22dce52a74fef0b9bed00404a1cd
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=58152ecbbcc6a0ce7fddd5bf5f6ee535834ece0c
https://security.archlinux.org/CVE-2018-5390


ASA-201808-7: linux-hardened: denial of service

Arch Linux Security Advisory ASA-201808-7
=========================================

Severity: High
Date : 2018-08-08
CVE-ID : CVE-2018-5390
Package : linux-hardened
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-750

Summary
=======

The package linux-hardened before version 4.17.11.a-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 4.17.11.a-1.

# pacman -Syu "linux-hardened>=4.17.11.a-1"

The problem has been fixed upstream in version 4.17.11.a.

Workaround
==========

None.

Description
===========

A flaw named SegmentSmack was found in the way the Linux kernel handled
specially crafted TCP packets. A remote attacker could use this flaw to
trigger time and calculation expensive calls to
tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending
specially modified packets within ongoing TCP sessions which could lead
to a CPU saturation and hence a denial of service on the system.
Maintaining the denial of service condition requires continuous two-way
TCP sessions to a reachable open port, thus the attacks cannot be
performed using spoofed IP addresses.

Impact
======

A remote attacker is able to saturate the CPU and hence cause a denial
of service on the host system by sending specially modified packets
within ongoing TCP sessions.

References
==========

https://www.kb.cert.org/vuls/id/962459
https://www.spinics.net/lists/netdev/msg514742.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=72cd43ba64fc172a443410ce01645895850844c8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f4a3313d8e2ca9fd8d8f45e40a2903ba782607e7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d4bf93ac12003f9b8e1e2de37fe27983deebdcf
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8541b21e781a22dce52a74fef0b9bed00404a1cd
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=58152ecbbcc6a0ce7fddd5bf5f6ee535834ece0c
https://security.archlinux.org/CVE-2018-5390





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