What’s Vulnerable › Vulnerabilities

CVE-2026-90324: ublk: check import_ubuf() return value

• 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: 2026-09-17 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: ublk: check import_ubuf() return value import_ubuf() can fail if the address range (provided by the userspace ublk server) is outside the allowed user address space. Return that 0 bytes were copied if import_ubuf() fails rather than passing an uninitialized struct iov_iter to ublk_copy_user_pages().

Affected products

• Linux kernel: 6.5 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0121c84adb6a4cd6f7560b5895bd88f9899bbc1f
• https://git.kernel.org/stable/c/27ff6e8703f7a7160c728501da2f8ef8e7bb6b2f
• https://git.kernel.org/stable/c/3831568792af75b6523fa93bb91560e29189cf55
• https://git.kernel.org/stable/c/5ac6019cb78e98c9608fda72726b36ddf8474dd7
• https://git.kernel.org/stable/c/7f97c762b5f6e0005c5c7d040ded73bf7fb3587e

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