What’s Vulnerable › Vulnerabilities

CVE-2021-41073

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-19 · updated 2026-06-17
• Weakness: CWE-763

Description

loop_rw_iter in fs/io_uring.c in the Linux kernel 5.10 through 5.14.6 allows local users to gain privileges by using IORING_OP_PROVIDE_BUFFERS to trigger a free of a kernel buffer, as demonstrated by using /proc/<pid>/maps for exploitation.

Affected products

• Debian Linux: 10.0
• Fedoraproject Fedora: 33, 34
• Linux kernel: from 5.10 before 5.10.68; from 5.11 before 5.14.7 — fixed in 5.10.68, 5.14.7
• NetApp Cloud Backup: all versions
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Solidfire Baseboard Management Controller: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.10.68, 5.14.7. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/09/18/2
• http://www.openwall.com/lists/oss-security/2021/09/18/2
• http://www.openwall.com/lists/oss-security/2021/09/18/2
• http://www.openwall.com/lists/oss-security/2021/09/18/2
• http://www.openwall.com/lists/oss-security/2022/06/04/4
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16c8d2df7ec0eed31b7d3b61cb13206a7fb930cc
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J7KSMIOQ4377CVTHMWNGNCWHMCRFRP2T/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAP4TXEZ7J4EZQMQW5SIJMWXG7WZT3F7/
• https://security.netapp.com/advisory/ntap-20211014-0003/
• https://www.debian.org/security/2021/dsa-4978
• http://www.openwall.com/lists/oss-security/2021/09/18/2
• http://www.openwall.com/lists/oss-security/2021/09/18/2

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