Vulnerability CVE-2018-18445
Published: 2018-10-17

Description:
In the Linux kernel 4.14.x, 4.15.x, 4.16.x, 4.17.x, and 4.18.x before 4.18.13, faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because adjust_scalar_min_max_vals in kernel/bpf/verifier.c mishandles 32-bit right shifts.

See advisories in our WLB2 database:
Topic
Author
Date
Low
Linux BPF Verifier Failed Truncation
Jann Horn
19.10.2018

Type:

CWE-125

 (Out-of-bounds Read)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Redhat -> Enterprise linux desktop 
Redhat -> Enterprise linux server 
Redhat -> Enterprise linux server aus 
Redhat -> Enterprise linux server eus 
Redhat -> Enterprise linux server tus 
Redhat -> Enterprise linux workstation 
Redhat -> Virtualization 
Linux -> Linux kernel 
Canonical -> Ubuntu linux 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b799207e1e1816b09e7a5920fbb2d5fcf6edd681
https://access.redhat.com/errata/RHSA-2019:0512
https://access.redhat.com/errata/RHSA-2019:0514
https://bugs.chromium.org/p/project-zero/issues/detail?id=1686
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.75
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.13
https://github.com/torvalds/linux/commit/b799207e1e1816b09e7a5920fbb2d5fcf6edd681
https://support.f5.com/csp/article/K38456756
https://usn.ubuntu.com/3832-1/
https://usn.ubuntu.com/3835-1/
https://usn.ubuntu.com/3847-1/
https://usn.ubuntu.com/3847-2/
https://usn.ubuntu.com/3847-3/
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