What’s Vulnerable › Vulnerabilities

CVE-2026-45962: ublk: Validate SQE128 flag before accessing the cmd

• 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: 2026-05-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ublk: Validate SQE128 flag before accessing the cmd ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before IO_URING_F_SQE128 flag check. This could cause out of boundary memory access. Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return -EINVAL immediately if the flag is not set.

Affected products

• Linux kernel: from 6.0 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.14; from 6.19 before 6.19.4 — fixed in 6.1.165, 6.12.75, 6.18.14, 6.19.4, 6.6.128

How to fix

Upgrade to a fixed version: Linux kernel 6.1.165, 6.12.75, 6.18.14, 6.19.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/17d33ba7291100008360b5a354962db37ad80684
• https://git.kernel.org/stable/c/31cac6acf77ece488f29fb8f79589d9298e969c8
• https://git.kernel.org/stable/c/4b4dff498f46e9802f71bc84258bf73065f51c6a
• https://git.kernel.org/stable/c/da7e4b75e50c087d2031a92f6646eb90f7045a67
• https://git.kernel.org/stable/c/dbe8e81a2ec608f87f79a34f6444cd62f6a243bb
• https://git.kernel.org/stable/c/f75a5555e0049e7857eae25b60aee98b80e287ec

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