Known exploited vulnerability
CVE-2021-22600
The short answer
CVE-2021-22600 affects Linux Kernel Kernel and is rated high (CVSS 7.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-04-11: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
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
Weakness: CWE-415.
Severity
7.0 high
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Apr 11, 2022
Federal due date May 2, 2022
EPSS, next 30 days
6.6%
Higher than 94% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
Kernel. NVD's record lists the exact affected versions.
References
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755 Mailing ListPatch
- lists.debian.org/debian-lts-announce/2022/03/msg00012.html Mailing ListThird Party Advisory
- security.netapp.com/advisory/ntap-20230110-0002/ Third Party Advisory
- www.debian.org/security/2022/dsa-5096 Third Party Advisory
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755 Mailing ListPatch
- lists.debian.org/debian-lts-announce/2022/03/msg00012.html Mailing ListThird Party Advisory
- security.netapp.com/advisory/ntap-20230110-0002/ Third Party Advisory
- www.debian.org/security/2022/dsa-5096 Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600 US Government Resource
Questions
Is CVE-2021-22600 being exploited?
Yes. CISA added CVE-2021-22600 to its Known Exploited Vulnerabilities catalog on 2022-04-11, with a federal remediation due date of 2022-05-02.
How do I fix CVE-2021-22600?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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