Answer in brief
CVE-2021-22600 records a High severity vulnerability in Double Free in net/packet/af_packet.c leading to priviledge escalation. The current sources mark it as known exploited. The current feed maps Linux Kernel/Kernel (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux Kernel/Kernel (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux Kernel/Kernelgeneric | >=unspecified <5.4.168 || >=unspecified <5.10.88 || >=unspecified <5.15.11 || >=unspecified <5.16-rc6 | 5.4.168, 5.10.88, 5.15.11, 5.16-rc6 |
Published upstream
Jan 26, 2022
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Apr 11, 2022
Evidence: source:kev:kev:kev:recordA 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
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-22600 records a High severity vulnerability in Double Free in net/packet/af_packet.c leading to priviledge escalation. The current sources mark it as known exploited. The current feed maps Linux Kernel/Kernel (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux Kernel/Kernel (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux Kernel/Kernelgeneric | >=unspecified <5.4.168 || >=unspecified <5.10.88 || >=unspecified <5.15.11 || >=unspecified <5.16-rc6 | 5.4.168, 5.10.88, 5.15.11, 5.16-rc6 |
Published upstream
Jan 26, 2022
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2025
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Apr 11, 2022
Evidence: source:kev:kev:kev:recordA 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
Quoted source text, attributed separately from HOL analysis.