Linux Kernel

CVE-2022-0847: Linux Kernel Privilege Escalation Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 25 Apr 2022, 49 days after the CVE record was published.

How likely is exploitation in the next 30 days?

92.8%

EPSS score, percentile 99.8 of all scored records

How severe?

7.8 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

Required action (CISA), due 16 May 2022: Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected: Linux Kernel 5.17 rc6

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: 16 May 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

https://nvd.nist.gov/vuln/detail/CVE-2022-0847

Affected products and versions

As listed in the CVE record.

n/a kernel
Status	Versions
Affected	Linux Kernel 5.17 rc6

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Linux kernel contains an improper initialization vulnerability where an unprivileged local user could escalate their privileges on the system. This vulnerability has the moniker of "Dirty Pipe."

Summary: CISA's KEV catalog, as of 28 Oct 2026.

CISA added CVE-2022-0847 to its Known Exploited Vulnerabilities (KEV) catalog on 25 Apr 2022.
CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
The due date CISA sets for the required action is 16 May 2022.
The CVE record was published on 7 Mar 2022, 49 days before it was added to KEV.
The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 92.8% (percentile 99.8), as of 28 Oct 2026.
CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

A 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 and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE-665: >CWE-281

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

Date	Event
7 Mar 2022	CVE record published
25 Apr 2022	Added to CISA KEV
16 May 2022	CISA due date for the required action
21 Oct 2025	CVE record last updated

References

More exploited Linux vulnerabilities

CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability (added 28 Oct 2026)
CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability (added 18 Sep 2026)
CVE-2025-39964: Linux Kernel Race Condition Vulnerability (added 18 Sep 2026)
CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability (added 18 Sep 2026)
CVE-2026-53362: Linux Kernel Unspecified Vulnerability (added 27 Aug 2026)
CVE-2022-0995: Linux Kernel Out-of-Bounds Write Vulnerability (added 26 Aug 2026)