CVE-2020-8835: Linux kernel bpf verifier vulnerability
Vulnerability summary
CVE-2020-8835 is a high (CVSS 7.8) Out-of-bounds Read vulnerability in canonical ubuntu_linux. EPSS estimates a 6.01% chance of exploitation in the next 30 days, higher than 93.3% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2Timeline
- 02-04-2020PublishedVulnerability first disclosed.
- 17-09-2024Last modifiedVulnerability information updated.
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)
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
6.01%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
No change 0.00 pp
From 6.01% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (openwall.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu10 products
- linux-azure-5.3< 5.3.0-1018.19~18.04.1
- linux-azure-edgeAll versions (No fix recorded)
- linux-gcp-5.3< 5.3.0-1016.17~18.04.1
- linux-gcp-edgeAll versions (No fix recorded)
- linux-gke-5.3< 5.3.0-1016.17~18.04.1
Canonical1 product
- ubuntu_linuxEOL18.04 | 19.10
Debian1 product
- linux< 5.5.13-2
Fedoraproject1 product
- fedoraEOL30 | 31 | 32
Linux1 product
- linux_kernel≥ 5.4.7, < 5.4.29 | ≥ 5.5.0, < 5.5.14 | ≥ 5.6, < 5.6.1
Linux kernel1 product
- linux kernel≥ 5.6-stable, < 5.6.1 | ≥ 5.5-stable, < 5.5.14 | ≥ 5.4.7, < 5.4-stable*
7 vendors · 39 products
References
18 links- www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-resultsX Refsource MISCREPORTThird Party Advisory
- www.openwall.com/lists/oss-security/2020/03/30/3X Refsource MISCREPORTMailing ListPatchThird Party Advisory
Show all 18 references
- www.openwall.com/lists/oss-security/2021/07/20/1Mailing ListX Refsource MLISTExploitThird Party Advisory
