CVE-2017-17863

Source
Severity Medium
Remote No
Type Denial of service
Description
It has been discovered that kernel/bpf/verifier.c in the Linux kernel before 4.14.9 and 4.9.72 does not check the relationship between pointer values and the BPF stack, which allows local users to cause a denial of service (integer overflow or invalid memory access) or possibly have unspecified other impact.
Group Package Affected Fixed Severity Status Ticket
AVG-574 linux-hardened 4.14.7.a-1 4.14.11.a-1 High Fixed FS#56832
AVG-571 linux-zen 4.14.7-1 4.14.11-1 High Fixed FS#56832
AVG-561 linux-lts 4.9.68-1 4.9.74-1 High Fixed
AVG-552 linux 4.14.7-1 4.14.11-1 High Fixed FS#56832
Date Advisory Group Package Severity Description
05 Jan 2018 ASA-201801-4 AVG-574 linux-hardened High multiple issues
05 Jan 2018 ASA-201801-3 AVG-571 linux-zen High multiple issues
05 Jan 2018 ASA-201801-2 AVG-561 linux-lts High multiple issues
05 Jan 2018 ASA-201801-1 AVG-552 linux High multiple issues
References
https://bugs.chromium.org/p/project-zero/issues/detail?id=1454
http://www.openwall.com/lists/oss-security/2017/12/21/2
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=d75d3ee237cee9068022117e059b64bbab617f3d
https://git.kernel.org/linus/de31796c052e47c99b1bb342bc70aa826733e862
Notes
Workaround by disabling unprivileged bpf:
sysctl -w kernel.unprivileged_bpf_disabled=1