Use After Free Affecting linux-4.9 package, versions <4.9.168-1+deb9u5~deb8u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN8-LINUX49-459257
- published26 Jul 2019
- disclosed26 Jul 2019
Introduced: 26 Jul 2019
CVE-2018-20856 (opens in a new tab)How to fix?
Upgrade Debian:8 linux-4.9 to version 4.9.168-1+deb9u5~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.
An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.
References
- https://security-tracker.debian.org/tracker/CVE-2018-20856
- https://seclists.org/bugtraq/2019/Aug/18
- https://seclists.org/bugtraq/2019/Aug/26
- https://security.netapp.com/advisory/ntap-20190905-0002/
- https://support.f5.com/csp/article/K14673240?utm_source=f5support&utm_medium=RSS
- https://www.debian.org/security/2019/dsa-4497
- https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54648cf1ec2d7f4b6a71767799c45676a138ca24
- https://github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24
- http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
- http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html
- http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7
- https://access.redhat.com/errata/RHSA-2019:3055
- https://access.redhat.com/errata/RHSA-2019:3076
- https://access.redhat.com/errata/RHSA-2019:3089
- https://access.redhat.com/errata/RHSA-2019:3217
- https://access.redhat.com/errata/RHSA-2020:0100
- https://access.redhat.com/errata/RHSA-2020:0103
- https://access.redhat.com/errata/RHSA-2020:0543
- https://access.redhat.com/errata/RHSA-2020:0664
- https://access.redhat.com/errata/RHSA-2020:0698
- https://usn.ubuntu.com/4116-1/
- https://usn.ubuntu.com/4118-1/
- https://usn.ubuntu.com/4094-1/
- https://support.f5.com/csp/article/K14673240?utm_source=f5support&%3Butm_medium=RSS