SB2020011467 - Privilege escalation in Linux kernel
Published: January 14, 2020 Updated: January 28, 2020
Security Bulletin ID
SB2020011467
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2020-7053)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the i915_ppgtt_close() function in drivers/gpu/drm/i915/i915_gem_gtt.c, related to i915_gem_context_destroy_ioctl() call in drivers/gpu/drm/i915/i915_gem_context.c. A local user can run a specially crafted application to execute arbitrary code on the system with elevated privileges.
Remediation
Install update from vendor's website.
References
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1859522
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7dc40713618c884bf07c030d1ab1f47a9dc1f310
- https://lore.kernel.org/stable/20200114183937.12224-1-tyhicks@canonical.com