HOMEVULNERABILITIESCVE-2020-8835
HIGH

CVE-2020-8835

CWE-125Published: April 2, 2020· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official 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)

NVD Source

Technical Analysis

CVE-2020-8835 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Canonical1 product(s)
ubuntu linux
Fedora1 product(s)
fedora
Linux1 product(s)
linux kernel
netapp44 product(s)
cloud backuphci management nodesolidfiresteelstore cloud integrated storagea700s firmwarea700s8300 firmware83008700 firmware8700a400 firmwarea400+32
Source: NVD CPE · 50 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
PATCHhttps://www.openwall.com/lists/oss-security/2020/03/30/3
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
PATCHhttps://www.openwall.com/lists/oss-security/2020/03/30/3
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/07/20/1
ADVISORYhttps://security.netapp.com/advisory/ntap-20200430-0004/
ADVISORYhttps://usn.ubuntu.com/4313-1/
ADVISORYhttps://usn.ubuntu.com/usn/usn-4313-1
ADVISORYhttps://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/07/20/1
ADVISORYhttps://security.netapp.com/advisory/ntap-20200430-0004/
ADVISORYhttps://usn.ubuntu.com/4313-1/
ADVISORYhttps://usn.ubuntu.com/usn/usn-4313-1
ADVISORYhttps://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results

All References (24)

→
http://www.openwall.com/lists/oss-security/2021/07/20/1Exploit · Mailing List · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fefPatch · Vendor Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fefPatch · Vendor Advisory
→
https://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/Third Party Advisory
→
https://usn.ubuntu.com/4313-1/Third Party Advisory
→
https://usn.ubuntu.com/usn/usn-4313-1Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2020/03/30/3Mailing List · Patch · Third Party Advisory
→
https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-resultsThird Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/07/20/1Exploit · Mailing List · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fefPatch · Vendor Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fefPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2020-8835
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected4 vendor(s)
PublishedApr 2, 2020

Related CVEs (CWE-125)

CVE-2021-41556
10.0
CVE-2021-21777
10.0
CVE-2013-0767
10.0
CVE-2017-14451
10.0
CVE-2009-2523
10.0
CVE-2023-26489
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-8835 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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