CVE-2026-21996: An unprivileged attacker can reliably trigger a crash of the dtrace process with a malicious ELF binary due to

Routine

LOW 3.3WATCHLISTMITIGATE

CVE-2026-21996 is a low-severity flaw (CVSS 3.3) affecting linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An unprivileged attacker can reliably trigger a crash of the dtrace process with a malicious ELF binary due to an integer Divide-by-Zero in Pbuild_file_symtab()

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-369
Published	2026-05-01
Last modified	2026-10-26

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-01 18:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

oracle linux MITIGATE

Affected: 8 · 9 0 · 10 0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21996?

linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-21996 being exploited?

CVE-2026-21996 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21996 affect?

CVE-2026-21996 affects linux. Severity is low (CVSS 3.3). An unprivileged attacker can reliably trigger a crash of the dtrace process with a malicious ELF binary due to an integer Divide-by-Zero in Pbuild_file_symtab()

How urgent is CVE-2026-21996?

Priority 17/100. On your watchlist

Related CVEs

CVE-2026-35233 MEDIUM 4.4 MITIGATE An unprivileged attacker can craft a user-space process with a malicious ELF binary containing an out-of-range
CVE-2015-5287 HIGH 7.8 EXPLOITED UPGRADE MITIGATE Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability

References

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