What’s Vulnerable › Vulnerabilities

CVE-2023-54305: ext4: refuse to create ea block when umounted

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: refuse to create ea block when umounted The ea block expansion need to access s_root while it is already set as NULL when umount is triggered. Refuse this request to avoid panic.

Affected products

• Linux kernel: 4.13 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/05cbf6ddd9847c7b4f0662c048f195b09405a9d0
• https://git.kernel.org/stable/c/0dc0fa313bb4e86382a3e7125429710d44383196
• https://git.kernel.org/stable/c/116008ada3d0de4991099edaf6b8c2e9cd6f225a
• https://git.kernel.org/stable/c/21f6a80d9234422e2eb445734b22c78fc5bf6719
• https://git.kernel.org/stable/c/a458a8c1d1fc4e10a1813786132b09a3863ad3f2
• https://git.kernel.org/stable/c/a92b67e768bde433b9385cde56c09deb58db269e
• https://git.kernel.org/stable/c/aedea161d031502a423ed1c7597754681a4f8cda
• https://git.kernel.org/stable/c/f31173c19901a96bb2ebf6bcfec8a08df7095c91

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