Out-of-bounds read in Linux kernel - CVE-2019-15666
Published: April 17, 2020
Vulnerability identifier: #VU26993
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-15666
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service attack.
The vulnerability exists due to a boundary condition in __xfrm_policy_unlink, which will cause denial of service, because
verify_newpolicy_info in net/xfrm/xfrm_user.c mishandles directory
validation.
Affected software
Linux kernel
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
kernel-alt (Red Hat package)
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
kernel-alt (Red Hat package)
How to mitigate CVE-2019-15666
Install updates from vendor's website.
Linux kernel - update to 5.0.19
kernel-alt (Red Hat package) - update to 4.14.0-115.19.1.el7a
kernel-alt (Red Hat package) - update to 4.14.0-115.19.1.el7a
External References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.19
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b805d78d300bcf2c83d6df7da0c818b0fee41427
- https://lists.debian.org/debian-lts-announce/2019/09/msg00014.html
- https://lists.debian.org/debian-lts-announce/2019/09/msg00015.html