CVE-2020-8835 Information

Description

In the Linux kernel 5.5.0 and newer the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series starting with v5.4.7 as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1 5.5.14 and 5.4.29. (issue is aka ZDI-CAN-10780)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/ https://lore.kernel.org/bpf/20200330160324.15259-1-daniel@iogearbox.net/T/ https://security.netapp.com/advisory/ntap-20200430-0004/ https://usn.ubuntu.com/4313-1/ https://usn.ubuntu.com/usn/usn-4313-1 https://www.openwall.com/lists/oss-security/2020/03/30/3 https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8