SB2019051705 - NULL pointer dereference in Linux kernel
Published: May 17, 2019 Updated: May 21, 2019
Security Bulletin ID
SB2019051705
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2018-7191)
The vulnerability allows local users to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when processing requests to ioctl(TUNSETIFF). A local user can cause a denial of service via a malicious ioctl(TUNSETIFF) call with a dev name containing a / character.
Remediation
Install update from vendor's website.
References
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1743792
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1748846
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.14
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ad646c81b2182f7fa67ec0c8c825e0ee165696d
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5c25f65fd1e42685f7ccd80e0621829c105785d9
- https://github.com/torvalds/linux/commit/0ad646c81b2182f7fa67ec0c8c825e0ee165696d
- https://github.com/torvalds/linux/commit/5c25f65fd1e42685f7ccd80e0621829c105785d9