What’s Vulnerable › Vulnerabilities

CVE-2023-53569: ext2: Check block size validity during mount

• Severity: high (CVSS 7.8 v3.1)
• 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: 2025-10-04 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ext2: Check block size validity during mount Check that log of block size stored in the superblock has sensible value. Otherwise the shift computing the block size can overflow leading to undefined behavior.

Affected products

• Linux kernel: from 2.6.12.1 before 4.14.316; from 4.15 before 4.19.284; from 4.20 before 5.4.244; from 5.5 before 5.10.181; from 5.11 before 5.15.113; from 5.16 before 6.1.30 — fixed in 4.14.316, 4.19.284, 5.10.181, 5.15.113, 5.4.244, 6.1.30

How to fix

Upgrade to a fixed version: Linux kernel 4.14.316, 4.19.284, 5.10.181, 5.15.113. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ebfaf14150f55550cffb1148ed3920143c7a69c
• https://git.kernel.org/stable/c/22ab5fed07ad4b206ea910fd0132d1a0d4831584
• https://git.kernel.org/stable/c/451b98155be5dfee05bc6e7c8b30c0be4add3f71
• https://git.kernel.org/stable/c/62aeb94433fcec80241754b70d0d1836d5926b0a
• https://git.kernel.org/stable/c/99f8a15af6c9f0653193104a9e70891f950c6001
• https://git.kernel.org/stable/c/c2e7776843a953fd7e48895c3880c277f996193e
• https://git.kernel.org/stable/c/c4813f858e5c3e4c4659ce95385c1c400c593e1e
• https://git.kernel.org/stable/c/e6f4fb28890c1361e0db9eb1adee3fc04e7fe7f5

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