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Public proof of conceptFix available

CVE-2020-8835

A public proof of concept exists; no exploitation attested.

  • Published2020-04-02
  • WeaknessCWE-125 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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)

Timeline

dates in UTC
  1. 2020-04-0218:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-8835?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-8835?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
30.x= 30no fix published
31.x= 31no fix published
32.x= 32no fix published
Linux linux kernel
BranchAffectedFixed in
5.6≥ 5.6, < 5.6.15.6.1
5.5≥ 5.5.0, < 5.5.145.5.14
5.4≥ 5.4.7, < 5.4.295.4.29
Canonical ubuntu linux
BranchAffectedFixed in
18.4= 18.04no fix published
19.10= 19.10no fix published

24 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • exfat-utilsMageia:7all versions · fixed in 1.3.0-2.mga7
  • kernelMageia:7all versions · fixed in 5.5.14-1.mga7
  • kernel-linusMageia:7all versions · fixed in 5.5.15-1.mga7
  • kmod-virtualboxMageia:7all versions · fixed in 6.0.18-8.mga7
  • kmod-xtables-addonsMageia:7all versions · fixed in 3.8-8.mga7
  • linuxDebian:14all versions · fixed in 5.5.13-2
  • linuxDebian:13all versions · fixed in 5.5.13-2
  • linuxDebian:12all versions · fixed in 5.5.13-2

8 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-8835 Red Hat Product Security

    kernel: out-of-bounds read/write in the bpf verifier

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
7 repositories, unverifiedPrabhashaka/Exploitation-CVE-2020-8835snappyJack/Rick_write_exp_CVE-2020-8835zilong3033/CVE-2020-8835SplendidSky/CVE-2020-8835digamma-ai/CVE-2020-8835-verification
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2020-04-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-774r-wvx9-mm68

Frequently asked questions

What is CVE-2020-8835?

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)

Is CVE-2020-8835 actively exploited?

Active exploitation of CVE-2020-8835 has not been confirmed. Its EPSS score was 6.0% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8835?

CVE-2020-8835 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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