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AUSCERT External Security Bulletin Redistribution
ESB-2018.1623
Security fixes for linux kernel
30 May 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-1000004 CVE-2018-8087 CVE-2018-1093
CVE-2018-1092 CVE-2017-17862
Reference: ESB-2018.1335
ESB-2018.0844
Original Bulletin:
https://lists.ubuntu.com/archives/ubuntu-security-announce/2018-May/004416.html
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Kernel Live Patch Security Notice LSN-0039-1
May 25, 2018
linux vulnerability
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A security issue affects these releases of Ubuntu:
| Series | Base kernel | Arch | flavors |
|------------------+--------------+----------+------------------|
| Ubuntu 14.04 LTS | 4.4.0 | amd64 | generic |
| Ubuntu 14.04 LTS | 4.4.0 | amd64 | lowlatency |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency |
Summary:
Several security issues were fixed in the kernel.
Software Description:
- - linux: Linux kernel
Details:
Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF)
implementation in the Linux kernel contained a branch-pruning logic issue
around unreachable code. A local attacker could use this to cause a denial
of service. (CVE-2017-17862)
The ext4_iget function in fs/ext4/inode.c in the Linux kernel through
4.15.15 mishandles the case of a root directory with a zero i_links_count,
which allows attackers to cause a denial of service
(ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted
ext4 image. (CVE-2018-1092)
The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux
kernel through 4.15.15 allows attackers to cause a denial of service
(out-of-bounds read and system crash) via a crafted ext4 image because
balloc.c and ialloc.c do not validate bitmap block numbers. (CVE-2018-1093)
A memory leak in the hwsim_new_radio_nl function in
drivers/net/wireless/mac80211_hwsim.c in the Linux kernel through 4.15.9
allows local users to cause a denial of service (memory consumption) by
triggering an out-of-array error case. (CVE-2018-8087)
Luo Quan and Wei Yang discovered that a race condition existed in the
Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when
handling ioctl()s. A local attacker could use this to cause a denial of
service (system deadlock). (CVE-2018-1000004)
Update instructions:
The problem can be corrected by updating your livepatches to the following
versions:
| Kernel | Version | flavors |
|---------------------------+----------+--------------------------|
| 4.4.0-124.148 | 39.1 | generic, lowlatency |
| lts-4.4.0-124.148~14.04.1 | 39.1 | generic, lowlatency |
| 4.15.0-20.21 | 39.3 | generic, lowlatency |
Additionally, you should install an updated kernel with these fixes and
reboot at your convienience.
References:
CVE-2017-17862, CVE-2018-1092, CVE-2018-1093, CVE-2018-8087, CVE-2018-1000004
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