Buffer overflow in Linux Kernel
CVE-2021-27365
An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.021 (81.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
- WhatsWrongAndWhy/CVE-2021-27365
- Iweisc/Kernel-CVE-2021-27365-hotfix
- EGI-Federation/SVG-advisories
- HaxorSecInfec/autoroot.sh
- Iweisc/Kernel-Module-192CV
- JlSakuya/Linux-Privilege-Escalation-Exploits
- a-roshbaik/Linux-Privilege-Escalation-Exploits
- aaronxie55/Presentation2_
- bollwarm/SecToolSet
- c4pt000/kernel-5.11.6-expSEHDsec-HAXM-cgroup-virtio-nvidia-amd-kaliwifi
References
- lists.debian.org/debian-lts-announce/2021/03/msg00010.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/03/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
- www.oracle.com/security-alerts/cpuoct2021.html (Patch, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/03/06/1 (Mailing List, Third Party Advisory)
- blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html (Exploit, Third Party Advisory)
- packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075… (VDB Entry, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210409-0001/ (Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-27365?
- CVE-2021-27365 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-03-07.
- How severe is CVE-2021-27365?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-27365 known to be exploited?
- 34 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.