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Vulnerability record · CVE-2021-27365 · published 7 March 2021

CVE-2021-27365: Netapp cloud backup out-of-bounds write vulnerability

NNetapp · Cloud Backup

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.

7.8 CVSS 3.1 High EPSS 2.1% · top 18.9% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 4.6
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
20References, 2 tagged exploit
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html Third Party AdvisoryVDB Entry
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html ExploitThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1182715 Issue TrackingThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ec98ea7070e94cc25a422ec97d1421e28d97b7ee Mailing ListPatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5 Mailing ListPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/03/06/1 Mailing ListThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html Third Party AdvisoryVDB Entry
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html ExploitThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1182715 Issue TrackingThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ec98ea7070e94cc25a422ec97d1421e28d97b7ee Mailing ListPatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5 Mailing ListPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/03/06/1 Mailing ListThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-27365), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.