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ExploitedIn CISA KEVFix available

CVE-2021-1048

Exploitation confirmed. First attested on 2022-05-23 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-12-15
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2021-12-1519:15CVE publishedNVD
  2. 2022-05-23Added to the CISA KEV catalogCISA KEV
  3. 2022-05-23Listed as exploited by GCVEGCVE
  4. 2022-05-23Exploitation first reportedCISA KEV
  5. 2025-02-0419:28SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-1048?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-1048?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Google android
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As google_android, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Android
    Affected
    • = Android kernelno fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-12-15

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • :linux_kernel:Androidfrom :0 · fixed in :2021-11-06
  • linuxUbuntu:18.04:LTSall versions · fixed in 4.15.0-126.129
  • linuxDebian:14all versions · fixed in 5.8.10-1
  • linuxDebian:13all versions · fixed in 5.8.10-1
  • linuxDebian:12all versions · fixed in 5.8.10-1
  • linux-awsUbuntu:18.04:LTSall versions · fixed in 4.15.0-1088.93
  • linux-aws-fipsUbuntu:Pro:FIPS-updates:18.04:LTSall versions · fixed in 4.15.0-2031.32
  • linux-aws-hweUbuntu:16.04:LTSall versions · fixed in 4.15.0-1088.93~16.04.1

19 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-1048 Red Hat Product Security

    kernel: Use After Free in epoll_loop_check_proc() which could result in a local privilege escalation

Full record on NVD

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-06-13
  2. Workaround from the vendor Red Hat Product Security CVE-2021-1048 · 198 productsMitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-05-23
Patch Due Date
2022-06-13
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-15
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-r535-rfwp-fm57

Frequently asked questions

What is 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. 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

Is CVE-2021-1048 actively exploited?

Yes. CVE-2021-1048 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-06-13.

What is the CVSS score for CVE-2021-1048?

CVE-2021-1048 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record