NVD / CVE Program· CNA google_android

CVE-2021-1048: In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free.

Noroxi assessment

Priority: This week (action score 61/100)

CISA has confirmed exploitation in the wild (May 23, 2022). Remediation deadline for US federal agencies: Jun 13, 2022.
Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 64.5% of all records.
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: linux (Debian:12) 5.8.10-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Don’t wait for the next maintenance window. Upgrade to linux (Debian:12) 5.8.10-1 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 · CISA KEV · FIRST EPSS

In ep_loop_check_proc of eventpoll.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-204573007References: Upstream kernel

HighCVSS 7.8 · v3.1KEVWeaponized Fix available

BDU:2021-05539

Published: Dec 15, 2021
Updated: Jun 16, 2026
EPSS: 1.0% · 64th percentile
CWE: CWE-416

Report tools

JSON

Action score

This week

Don’t wait for the next maintenance window.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 0 / 30 · 1.0%

CISA SSVC decision

Exploitation: active
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on May 23, 2022. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Jun 13, 2022.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

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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.

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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.

Vendor	Product	CPE
google	android	cpe:2.3:o:google:android

Affected versions

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

google androidall versions

Versions reported by the vendor

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

n/a Android
- Android kernelaffected

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 5.8.10-1	5.8.10-1

Same product

google: all records

Other highest-scoring records for the same primary product.

CVE-2019-2215A use-after-free in binder.c allows an elevation of privilege from an application to the Linux Kernel.KEV
83Now
CVE-2011-1823The vold volume manager daemon on Android 3.0 and 2.x before 2.3.4 trusts messages that are received from a PF_NETLINK socket, which allows KEV
73This week
CVE-2015-1538Integer overflow in the SampleTable::setSampleToChunkParams function in SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I all
70This week

Published before and after this one in the same product

← EarlierCVE-2021-1046Dec 15, 2021 · In lwis_dpm_update_clock of lwis_device_dpm.c, there is a possible out of bounds read due to an incorrect bounds check.
17Monitor
← EarlierCVE-2021-1047Dec 15, 2021 · In valid_ipc_dram_addr of cm_access_control.c, there is a possible out of bounds read due to an integer overflow.
17Monitor
Later →CVE-2021-39636Dec 15, 2021 · In do_ipt_get_ctl and do_ipt_set_ctl of ip_tables.c, there is a possible way to leak kernel information due to uninitialized data.
17Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
debian:linux	5.8.10-1 · Debian:12	Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

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.

PublishedDec 15, 2021
CISA KEVMay 23, 2022+158 d
TodayNov 5, 2026+1786 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

No commit or PR link among the references.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-21-0890 · Nov 4, 2021(Google Android Güvenlik Zafiyeti)

All national notices →

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.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:48 PM UTC

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

References

source.android.com/security/bulletin/2021-11-01

Show all references (1 more)

www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1048

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

All records