CVE-2026-45972 (CVSS 9.8)

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0050

Probability of exploitation

0.39%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0 https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81 https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151 https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74 https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73 https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda

Frequently Asked Questions

What is CVE-2026-45972? +

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-45972? +

CVE-2026-45972 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0050, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-45972? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-45972