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CVE-2018-1000204 Affecting linux-4.9 package, versions <4.9.110-1~deb8u1

Severity

 Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-DEBIAN8-LINUX49-263039
  • published26 Jun 2018
  • disclosed26 Jun 2018
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Introduced: 26 Jun 2018

CVE-2018-1000204  (opens in a new tab)

How to fix?

Upgrade Debian:8 linux-4.9 to version 4.9.110-1~deb8u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-4.9 package and not the linux-4.9 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has limited scope, as users don't usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing chmod o+r+w /dev/sg* to make the devices accessible. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it "virtually impossible to exploit.