Skip to content
Noroxi
CVE-2020-35508· NVD / CVE Program· CNA redhat

A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux kernel child/parent process ident

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: linux (Debian:12) 5.9.9-1; bpftool (Red Hat:rhel_eus:8.2::baseos) 0:4.18.0-193.60.2.el8_2; bpftool-debuginfo (Red Hat:rhel_eus:8.2::baseos) 0:4.18.0-193.60.2.el8_2.

Low priority for now. Upgrade to linux (Debian:12) 5.9.9-1; bpftool (Red Hat:rhel_eus:8.2::baseos) 0:4.18.0-193.60.2.el8_2; bpftool-debuginfo (Red Hat:rhel_eus:8.2::baseos) 0:4.18.0-193.60.2.el8_2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux kernel child/parent process identification handling while filtering signal handlers. A local attacker is able to abuse this flaw to bypass checks to send any signal to a privileged process.

MediumCVSS 4.5 · v3.1—No exploit Fix available
Published
Mar 26, 2021
Updated
Jun 16, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-35508

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux
netappa700s firmware
netappa700s
netappbrocade fabric operating system firmware
netappfas8300 firmware
netappfas8300
netappfas8700 firmware
netappfas8700
netappaff a400 firmware
netappaff a400
netapph300s firmware

and 21 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 5.12
  • linux linux kernel5.12
  • netapp a700s firmwareall versions
  • netapp aff a400 firmwareall versions
  • netapp brocade fabric operating system firmwareall versions
  • netapp fas8300 firmwareall versions
  • netapp fas8700 firmwareall versions
  • netapp h300e firmwareall versions
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500e firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h610c firmwareall versions
  • netapp h610s firmwareall versions
  • netapp h615c firmwareall versions
  • netapp h700e firmwareall versions
  • netapp h700s firmwareall versions
  • redhat enterprise linux8.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a kernel

    • kernel 5.12affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.9.9-15.9.9-1
Red Hat:rhel_eus:8.2::baseosbpftoolbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseosbpftool-debuginfobefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernelbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-abi-whitelistsbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-corebefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debugbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debug-corebefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debug-debuginfobefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debug-develbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debug-modulesbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debug-modules-extrabefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debuginfobefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-develbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-docbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-modulesbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-modules-extrabefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-toolsbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-tools-debuginfobefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2
Red Hat:rhel_eus:8.2::baseoskernel-tools-libsbefore 0:4.18.0-193.60.2.el8_20:4.18.0-193.60.2.el8_2

+26

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-20219Mar 23, 2021 · A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel.
    22Monitor
  • ← EarlierCVE-2021-3444Mar 23, 2021 · Linux kernel bpf verifier incorrect mod32 truncation
    31Monitor
  • Later →CVE-2021-29264Mar 26, 2021 · An issue was discovered in the Linux kernel through 5.11.10.
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.9.9-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-193.60.2.el8_2 · Red Hat:rhel_eus:8.2::baseosPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-665 · Improper Initialization

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records