CVE-2018-1108

Published: 21 May 2018

kernel drivers before version 4.17-rc1 are vulnerable to a weakness in the Linux kernel's implementation of random seed data. Programs, early in the boot sequence, could use the data allocated for the seed before it was sufficiently generated.

From the Ubuntu Security Team

Jann Horn discovered that the Linux kernel's implementation of random seed data reported that it was in a ready state before it had gathered sufficient entropy. An attacker could use this to expose sensitive information.

Notes

not clear if RNDRESEEDCRNG ioctl should be backported, too;
it's unlikely user space will receive backports to support it.
fix introduced regression bug LP: #1779827

Status

Severity score breakdown

References

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43838a23a05fbd13e47d750d3dfd77001536dd33
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dc12baacb95f205948f64dc936a47d89ee110117
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ef35c866f8862df074a49a93b0309725812dea8
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1559
• https://ubuntu.com/security/notices/USN-3752-1
• https://ubuntu.com/security/notices/USN-3752-2
• https://ubuntu.com/security/notices/USN-3752-3
• https://www.cve.org/CVERecord?id=CVE-2018-1108
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1779827