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ExploitedIn CISA KEVFix available

CVE-2021-22600

Exploitation confirmed. First attested on 2022-04-11 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2022-01-26
  • Fixed in5.15.11 · 5.10.88 · 5.4.168 · 4.19.222 · 4.14.259
  • WeaknessCWE-415

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

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

Timeline

dates in UTC
  1. 2022-01-2614:15CVE publishedNVD
  2. 2022-04-11Added to the CISA KEV catalogCISA KEV
  3. 2022-04-11Listed as exploited by GCVEGCVE
  4. 2022-04-11Exploitation first reportedCISA KEV
  5. 2025-01-2920:47SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
5.x≥ 5.11, < 5.15.115.15.11
5.x≥ 5.5.14, < 5.10.885.10.88
5.4≥ 5.4.29, < 5.4.1685.4.168
4.19≥ 4.19.114, < 4.19.2224.19.222
4.14≥ 4.14.175, < 4.14.2594.14.259
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
10.0= 10.0no fix published
Netapp 8300 firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

8 more products in the sources.

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

  • Linux Kernel Kernel
    Affected
    • < 5.4.168fixed in 5.4.168custom
    • < 5.10.88fixed in 5.10.88custom
    • < 5.15.11fixed in 5.15.11custom
    • < 5.16-rc6fixed in 5.16-rc6custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-01-10

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 :2022-05-05
  • :linux_kernel:Androidfrom :0 · fixed in :2022-03-05
  • dtb-aarch64openSUSE:Leap 15.3all versions · fixed in 5.3.18-150300.59.49.1and 11 other packages
  • kernelopenEuler:20.03-LTS-SP3all versions · fixed in 4.19.90-2202.1.0.0136.oe1
  • kernelopenEuler:20.03-LTS-SP2all versions · fixed in 4.19.90-2202.1.0.0135.oe1
  • kernelopenEuler:20.03-LTS-SP1all versions · fixed in 4.19.90-2202.1.0.0136.oe1
  • kernelAzure Linux:2all versions · fixed in 5.15.18.1-1
  • kernel-64kbSUSE:Linux Enterprise Module for Basesystem 15 SP3all versions · fixed in 5.3.18-150300.59.49.1and 4 other packages

122 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-22600 Red Hat Product Security

    kernel: double free in packet_set_ring() in net/packet/af_packet.c

Full record on NVD

Fix

  1. Update Linux linux kernel to 5.15.11 · 5.10.88 · 5.4.168 · 4.19.222 · 4.14.259
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-02
  3. Workaround from the vendor Red Hat Product Security CVE-2021-22600 · 198 productsOnly users with access to the AF_PACKET socket can trigger this vulnerability. The mitigation would be to disable CAP_NET_RAW capability for the users that prevents access to AF_PACKET.

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-04-11
Patch Due Date
2022-05-02
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

  • CISA KEVKEV entry2022-04-11
  • ENISA EUVDexploitation2022-04-112022-04-11
  • GCVEexploitation2022-04-11
  • CISA-ADPSSVC decisionactive2025-01-29
  • CNACVSS 3.16.6known since 2026-10-23
  • NVDCVSS 3.17read 2026-10-23
  • NVDCVSS 2.07.2read 2026-10-23
  • CNAweakness (CWE)CWE-415known since 2026-10-23
  • NVDweakness (CWE)CWE-415read 2026-10-23
  • FIRST EPSSEPSS score6.6 %2026-11-04
  • PoC-in-GitHubproof of concept2known since 2026-11-01
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2022-01-26
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-6rrc-7vqp-364c

Frequently asked questions

What is CVE-2021-22600?

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

Is CVE-2021-22600 actively exploited?

Yes. CVE-2021-22600 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 2022-05-02.

What is the CVSS score for CVE-2021-22600?

CVE-2021-22600 has a CVSS v3 base score of 7 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

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