CVE-2021-22600
Confirmed PUBLISHEDDouble Free in net/packet/af_packet.c leading to priviledge escalation
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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
- CVE Published
- Jan 26, 2022
- Exploitation Reported
- Apr 11, 2022
- CVSS
- 6.6 Medium
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Linux Kernel |
Kernel
|
unspecified to < 5.4.168 |
Affected |
| Linux Kernel |
Kernel
|
unspecified to < 5.10.88 |
Affected |
| Linux Kernel |
Kernel
|
unspecified to < 5.15.11 |
Affected |
| Linux Kernel |
Kernel
|
unspecified to < 5.16-rc6 |
Affected |
CVE References
- DSA-5096 debian.org · Vendor Advisory https://www.debian.org/security/2022/dsa-5096
- [debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update lists.debian.org · Mailing List https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/... git.kernel.org · CVE Record https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/co...
- security.netapp.com/advisory/ntap-20230110-0002 security.netapp.com · CVE Record https://security.netapp.com/advisory/ntap-20230110-0002/
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-04-11 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H
Exploitation Status
Exploited in the wild
Recorded 2022-04-11 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Double Free
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 5 years ago00:00 UTC · over 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-22600
{
"cve_id": "CVE-2021-22600",
"title": "Double Free in net/packet/af_packet.c leading to priviledge escalation",
"affected_vendor": "Linux Kernel",
"affected_product": "Kernel",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 6.6,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}