What’s Vulnerable › Vulnerabilities

CVE-2021-45868

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-18 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can, for example, lead to a kernel/locking/rwsem.c use-after-free if there is a corrupted quota file.

Affected products

• Linux kernel: before 5.15.3 — fixed in 5.15.3
• 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

How to fix

Upgrade to a fixed version: Linux kernel 5.15.3. Check the vendor advisory for mitigations.

References

• https://bugzilla.kernel.org/show_bug.cgi?id=214655
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050
• https://security.netapp.com/advisory/ntap-20220419-0003/
• https://www.openwall.com/lists/oss-security/2022/03/17/1
• https://www.openwall.com/lists/oss-security/2022/03/17/2
• https://bugzilla.kernel.org/show_bug.cgi?id=214655
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050
• https://security.netapp.com/advisory/ntap-20220419-0003/
• https://www.openwall.com/lists/oss-security/2022/03/17/1
• https://www.openwall.com/lists/oss-security/2022/03/17/2

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