CVE-2020-8835

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)

References

https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results

https://www.openwall.com/lists/oss-security/2020/03/30/3

https://usn.ubuntu.com/usn/usn-4313-1

https://usn.ubuntu.com/4313-1/

https://security.netapp.com/advisory/ntap-20200430-0004/

https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef

http://www.openwall.com/lists/oss-security/2021/07/20/1

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3