What’s Vulnerable › Vulnerabilities

CVE-2023-53269: block: ublk: make sure that block size is set correctly

• Severity: medium (CVSS 5.5 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: 2025-09-16 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: block: ublk: make sure that block size is set correctly block size is one very key setting for block layer, and bad block size could panic kernel easily. Make sure that block size is set correctly. Meantime if ublk_validate_params() fails, clear ub->params so that disk is prevented from being added.

Affected products

• Linux kernel: from 6.0 before 6.1.24; from 6.2 before 6.2.11; 6.3-rc1, 6.3-rc2, 6.3-rc3, 6.3-rc4, 6.3-rc5 — fixed in 6.1.24, 6.2.11

How to fix

Upgrade to a fixed version: Linux kernel 6.1.24, 6.2.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1d1665279a845d16c93687389e364386e3fe0f38
• https://git.kernel.org/stable/c/231a49460ac0203270da2471928d392e5586370f
• https://git.kernel.org/stable/c/9dbe85ac618ef6ae60abe5dd17ae2b29065d9c1e

Get alerted when CVE-2023-53269 or the next vulnerability affects your stack