{"id":"CVE-2020-8835","published":"2020-04-02T18:00:23Z","modified":"2024-09-17T02:15:48Z","title":"Linux kernel bpf verifier vulnerability","vendor":"Linux kernel","product":"Linux kernel","tier":"core","eol":null,"affectedVersions":[{"vendor":"Linux kernel","product":"Linux kernel","versions":[">= 5.6-stable, < 5.6.1",">= 5.5-stable, < 5.5.14",">= 5.4.7, < 5.4-stable*"]}],"description":{"text":"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)","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.0601,"percentile":0.93318,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":2,"pulses":[{"name":"CVE Data","url":"https://otx.alienvault.com/pulse/69929b597293fe5837b9c95c","created":"2026-02-16"},{"name":"Thor-Lite Linux 64 (06.11.24) - enriched a bit more but not 'pruned'","url":"https://otx.alienvault.com/pulse/6668b85065eec626e4766a38","created":"2024-06-11"}],"provenance":"machine"},"cwes":[],"references":[{"url":"https://usn.ubuntu.com/4313-1/","tags":["vendor-advisory","x_refsource_UBUNTU"]},{"url":"https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results","tags":["x_refsource_MISC"]},{"url":"https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/","tags":["x_refsource_MISC"]},{"url":"https://www.openwall.com/lists/oss-security/2020/03/30/3","tags":["x_refsource_MISC"]},{"url":"https://usn.ubuntu.com/usn/usn-4313-1","tags":["x_refsource_MISC"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef","tags":["x_refsource_MISC"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef","tags":["x_refsource_MISC"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://security.netapp.com/advisory/ntap-20200430-0004/","tags":["x_refsource_CONFIRM"]},{"url":"http://www.openwall.com/lists/oss-security/2021/07/20/1","tags":["mailing-list","x_refsource_MLIST"]}],"techniques":[{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-29678","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-29678","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":5,"earliest":"2020-07-04","earliestUrl":"https://github.com/snappyJack/Rick_write_exp_CVE-2020-8835","repos":[{"name":"snappyJack/Rick_write_exp_CVE-2020-8835","url":"https://github.com/snappyJack/Rick_write_exp_CVE-2020-8835","stars":4,"created":"2020-07-04"},{"name":"digamma-ai/CVE-2020-8835-verification","url":"https://github.com/digamma-ai/CVE-2020-8835-verification","stars":2,"created":"2021-06-04"}]},"first":{"date":"2020-07-04","source":"PoC-in-GitHub","url":"https://github.com/snappyJack/Rick_write_exp_CVE-2020-8835"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"related","techniques":["T1068"],"provenance":"source","lowConfidence":true}],"timeline":[{"date":"2020-04-02","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2020-8835","provenance":"source"},{"date":"2020-07-04","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/snappyJack/Rick_write_exp_CVE-2020-8835","provenance":"source"}],"speed":{"daysToPublicExploit":93,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":30.2,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":18.66,"detail":"percentile 0.9332"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":1.08,"detail":"2 pulses"},{"name":"CVSS severity","points":5.46,"detail":"base score 7.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}