Linux kernel bpf verifier vulnerability
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 6.0%
exploitation probability
6.0%top 7% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Linux kernel · Linux kernelReferences
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fefhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fefhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/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/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/https://security.netapp.com/advisory/ntap-20200430-0004/https://usn.ubuntu.com/4313-1/https://usn.ubuntu.com/usn/usn-4313-1https://www.openwall.com/lists/oss-security/2020/03/30/3https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-resultshttp://www.openwall.com/lists/oss-security/2021/07/20/1