What’s Vulnerable › Vulnerabilities
CVE-2021-27365
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.1% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-03-07 · updated 2026-07-30
- Weakness: CWE-787
Description
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.
Affected products
- Debian Linux: 9.0
- Linux kernel: before 4.4.260; from 4.5 before 4.9.260; from 4.10 before 4.14.224; from 4.15 before 4.19.179; from 4.20 before 5.4.103; from 5.5 before 5.10.21 — fixed in 4.14.224, 4.19.179, 4.4.260, 4.9.260, 5.10.21, 5.11.4
- NetApp Cloud Backup: all versions
- NetApp Solidfire Baseboard Management Controller Firmware: all versions
- Oracle Tekelec Platform Distribution: from 7.4.0 through 7.7.1
How to fix
Upgrade to a fixed version: Linux kernel 4.14.224, 4.19.179, 4.4.260, 4.9.260. Check the vendor advisory for mitigations.
References
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
- https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
- https://bugzilla.suse.com/show_bug.cgi?id=1182715
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ec98ea7070e94cc25a422ec97d1421e28d97b7ee
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
- https://security.netapp.com/advisory/ntap-20210409-0001/
- https://www.openwall.com/lists/oss-security/2021/03/06/1
- https://www.oracle.com/security-alerts/cpuoct2021.html
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
- https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
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